/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.phoenix.util;

import static com.google.common.base.Preconditions.checkNotNull;
import static org.apache.phoenix.coprocessor.MetaDataProtocol.CURRENT_CLIENT_VERSION;
import static org.apache.phoenix.coprocessor.MetaDataProtocol.getVersion;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.ARRAY_SIZE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.CACHE_SIZE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.COLUMN_FAMILY;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.COLUMN_NAME;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.COLUMN_SIZE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.CURRENT_VALUE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.CYCLE_FLAG;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.DATA_TABLE_NAME;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.DATA_TYPE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.DECIMAL_DIGITS;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.INCREMENT_BY;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.LIMIT_REACHED_FLAG;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.LINK_TYPE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.MAX_VALUE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.MIN_VALUE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.ORDINAL_POSITION;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.SALT_BUCKETS;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.SORT_ORDER;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.START_WITH;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.SYSTEM_CATALOG_NAME;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.SYSTEM_CATALOG_SCHEMA;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.SYSTEM_CATALOG_TABLE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.TABLE_CAT;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.TABLE_NAME;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.TABLE_SCHEM;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.TABLE_SEQ_NUM;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.TABLE_TYPE;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.TENANT_ID;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.UPDATE_CACHE_FREQUENCY;
import static org.apache.phoenix.jdbc.PhoenixDatabaseMetaData.VIEW_INDEX_ID;
import static org.apache.phoenix.query.QueryConstants.BASE_TABLE_BASE_COLUMN_COUNT;
import static org.apache.phoenix.query.QueryConstants.DIVERGED_VIEW_BASE_COLUMN_COUNT;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.TimeoutException;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.google.common.base.Strings;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Mutation;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
import org.apache.hadoop.hbase.regionserver.LocalIndexSplitter;
import org.apache.hadoop.hbase.snapshot.SnapshotCreationException;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.phoenix.coprocessor.MetaDataEndpointImpl;
import org.apache.phoenix.coprocessor.MetaDataProtocol;
import org.apache.phoenix.coprocessor.MetaDataProtocol.MetaDataMutationResult;
import org.apache.phoenix.coprocessor.MetaDataProtocol.MutationCode;
import org.apache.phoenix.coprocessor.TableInfo;
import org.apache.phoenix.jdbc.PhoenixConnection;
import org.apache.phoenix.jdbc.PhoenixDatabaseMetaData;
import org.apache.phoenix.query.ConnectionQueryServices;
import org.apache.phoenix.query.QueryConstants;
import org.apache.phoenix.query.QueryServices;
import org.apache.phoenix.schema.MetaDataClient;
import org.apache.phoenix.schema.PName;
import org.apache.phoenix.schema.PNameFactory;
import org.apache.phoenix.schema.PTable;
import org.apache.phoenix.schema.PTable.IndexType;
import org.apache.phoenix.schema.PTable.LinkType;
import org.apache.phoenix.schema.PTableType;
import org.apache.phoenix.schema.SaltingUtil;
import org.apache.phoenix.schema.SequenceAllocation;
import org.apache.phoenix.schema.SequenceAlreadyExistsException;
import org.apache.phoenix.schema.SequenceKey;
import org.apache.phoenix.schema.SortOrder;
import org.apache.phoenix.schema.TableNotFoundException;
import org.apache.phoenix.schema.types.PBinary;
import org.apache.phoenix.schema.types.PBoolean;
import org.apache.phoenix.schema.types.PChar;
import org.apache.phoenix.schema.types.PDataType;
import org.apache.phoenix.schema.types.PDecimal;
import org.apache.phoenix.schema.types.PDouble;
import org.apache.phoenix.schema.types.PFloat;
import org.apache.phoenix.schema.types.PInteger;
import org.apache.phoenix.schema.types.PLong;
import org.apache.phoenix.schema.types.PVarbinary;
import org.apache.phoenix.schema.types.PVarchar;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Objects;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;

public class UpgradeUtil {
    private static final Logger LOGGER = LoggerFactory.getLogger(UpgradeUtil.class);
    private static final byte[] SEQ_PREFIX_BYTES = ByteUtil.concat(QueryConstants.SEPARATOR_BYTE_ARRAY, Bytes.toBytes("_SEQ_"));
    public static final byte[] UPGRADE_TO_4_7_COLUMN_NAME = Bytes.toBytes("UPGRADE_TO_4_7");
    /**
     * Attribute for Phoenix's internal purposes only. When this attribute is set on a phoenix connection, then
     * the upgrade code for upgrading the cluster to the new minor release is not triggered. Note that presence 
     * of this attribute overrides a true value for {@value QueryServices#AUTO_UPGRADE_ENABLED}.     
     */
    private static final String DO_NOT_UPGRADE = "DoNotUpgrade";
    public static String UPSERT_BASE_COLUMN_COUNT_IN_HEADER_ROW = "UPSERT "
            + "INTO SYSTEM.CATALOG "
            + "(TENANT_ID, TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, COLUMN_FAMILY, BASE_COLUMN_COUNT) "
            + "VALUES (?, ?, ?, ?, ?, ?) ";

    public static final String UPSERT_UPDATE_CACHE_FREQUENCY =
            "UPSERT INTO " + SYSTEM_CATALOG_SCHEMA + ".\"" + SYSTEM_CATALOG_TABLE + "\"( " +
            TENANT_ID + "," +
            TABLE_SCHEM + "," +
            TABLE_NAME + "," +
            UPDATE_CACHE_FREQUENCY +
            ") VALUES (?, ?, ?, ?)";

    public static String SELECT_BASE_COLUMN_COUNT_FROM_HEADER_ROW = "SELECT "
            + "BASE_COLUMN_COUNT "
            + "FROM \"SYSTEM\".CATALOG "
            + "WHERE "
            + "COLUMN_NAME IS NULL "
            + "AND "
            + "COLUMN_FAMILY IS NULL "
            + "AND "
            + "TENANT_ID %s "
            + "AND "
            + "TABLE_SCHEM %s "
            + "AND "
            + "TABLE_NAME = ? "
            ;
    
    private static final String UPDATE_LINK =
            "UPSERT INTO " + SYSTEM_CATALOG_SCHEMA + ".\"" + SYSTEM_CATALOG_TABLE + "\"( " +
            TENANT_ID + "," +
            TABLE_SCHEM + "," +
            TABLE_NAME + "," +
            COLUMN_FAMILY + "," +
            LINK_TYPE + "," +
            TABLE_SEQ_NUM +"," +
            TABLE_TYPE +
            ") SELECT " + TENANT_ID + "," + TABLE_SCHEM + "," + TABLE_NAME + ",'%s' AS "
            + COLUMN_FAMILY + " ," + LINK_TYPE + "," + TABLE_SEQ_NUM + "," + TABLE_TYPE +" FROM " + SYSTEM_CATALOG_SCHEMA + ".\""
            + SYSTEM_CATALOG_TABLE + "\" WHERE  (" + TABLE_SCHEM + "=? OR (" + TABLE_SCHEM + " IS NULL AND ? IS NULL)) AND " + TABLE_NAME + "=? AND " + COLUMN_FAMILY + "=? AND " + LINK_TYPE + " = "
            + LinkType.PHYSICAL_TABLE.getSerializedValue();

    private static final String DELETE_LINK = "DELETE FROM " + SYSTEM_CATALOG_SCHEMA + "." + SYSTEM_CATALOG_TABLE
            + " WHERE (" + TABLE_SCHEM + "=? OR (" + TABLE_SCHEM + " IS NULL AND ? IS NULL)) AND " + TABLE_NAME + "=? AND " + COLUMN_FAMILY + "=? AND " + LINK_TYPE + " = " + LinkType.PHYSICAL_TABLE.getSerializedValue();
    
    private UpgradeUtil() {
    }

    private static byte[] getSequenceSnapshotName() {
        return Bytes.toBytes("_BAK_" + PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_NAME);
    }
    
    private static void createSequenceSnapshot(Admin admin, PhoenixConnection conn) throws SQLException {
        byte[] tableName = getSequenceSnapshotName();
        TableDescriptor desc = TableDescriptorBuilder.newBuilder(TableName.valueOf(tableName))
                .addColumnFamily(ColumnFamilyDescriptorBuilder.of(PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_FAMILY_BYTES))
                .build();
        try {
            admin.createTable(desc);
            copyTable(conn, PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_NAME_BYTES, tableName);
        } catch (IOException e) {
            throw ServerUtil.parseServerException(e);
        }
    }
    
    private static void restoreSequenceSnapshot(Admin admin, PhoenixConnection conn) throws SQLException {
        byte[] tableName = getSequenceSnapshotName();
        copyTable(conn, tableName, PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_NAME_BYTES);
    }
    
    private static void deleteSequenceSnapshot(Admin admin) throws SQLException {
        TableName tableName = TableName.valueOf(getSequenceSnapshotName());
        try {
            admin.disableTable(tableName);
            admin.deleteTable(tableName);
        } catch (IOException e) {
            throw ServerUtil.parseServerException(e);
        }
    }

    @SuppressWarnings("deprecation")
    private static void copyTable(PhoenixConnection conn, byte[] sourceName, byte[] targetName) throws SQLException {
        int batchSizeBytes = 100 * 1024; // 100K chunks
        int sizeBytes = 0;
        List<Mutation> mutations =  Lists.newArrayListWithExpectedSize(10000);

        Scan scan = new Scan();
        scan.setRaw(true);
        scan.setMaxVersions();
        ResultScanner scanner = null;
        Table source = null;
        Table target = null;
        try {
            source = conn.getQueryServices().getTable(sourceName);
            target = conn.getQueryServices().getTable(targetName);
            scanner = source.getScanner(scan);
            Result result;
             while ((result = scanner.next()) != null) {
                for (Cell keyValue : result.rawCells()) {
                    sizeBytes += CellUtil.estimatedSerializedSizeOf(keyValue);
                    if (KeyValue.Type.codeToType(keyValue.getTypeByte()) == KeyValue.Type.Put) {
                        // Put new value
                        Put put = new Put(keyValue.getRowArray(), keyValue.getRowOffset(), keyValue.getRowLength());
                        put.add(keyValue);
                        mutations.add(put);
                    } else if (KeyValue.Type.codeToType(keyValue.getTypeByte()) == KeyValue.Type.Delete){
                        // Copy delete marker using new key so that it continues
                        // to delete the key value preceding it that will be updated
                        // as well.
                        Delete delete = new Delete(keyValue.getRowArray(), keyValue.getRowOffset(), keyValue.getRowLength());
                        delete.addDeleteMarker(keyValue);
                        mutations.add(delete);
                    }
                }
                if (sizeBytes >= batchSizeBytes) {
                    LOGGER.info("Committing bactch of temp rows");
                    target.batch(mutations, null);
                    mutations.clear();
                    sizeBytes = 0;
                }
            }
            if (!mutations.isEmpty()) {
                LOGGER.info("Committing last bactch of temp rows");
                target.batch(mutations, null);
            }
            LOGGER.info("Successfully completed copy");
        } catch (SQLException e) {
            throw e;
        } catch (Exception e) {
            throw ServerUtil.parseServerException(e);
        } finally {
            try {
                if (scanner != null) scanner.close();
            } finally {
                try {
                    if (source != null) source.close();
                } catch (IOException e) {
                    LOGGER.warn("Exception during close of source table",e);
                } finally {
                    try {
                        if (target != null) target.close();
                    } catch (IOException e) {
                        LOGGER.warn("Exception during close of target table",e);
                    }
                }
            }
        }
    }
    
    private static void preSplitSequenceTable(PhoenixConnection conn, int nSaltBuckets) throws SQLException {
        Admin admin = conn.getQueryServices().getAdmin();
        boolean snapshotCreated = false;
        boolean success = false;
        try {
            if (nSaltBuckets <= 0) {
                return;
            }
            LOGGER.warn("Pre-splitting SYSTEM.SEQUENCE table " + nSaltBuckets + "-ways. This may take some time - please do not close window.");
            TableDescriptor desc = admin.getDescriptor(TableName.valueOf(PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_NAME_BYTES));
            createSequenceSnapshot(admin, conn);
            snapshotCreated = true;
            admin.disableTable(TableName.valueOf(PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_NAME));
            admin.deleteTable(TableName.valueOf(PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_NAME));
            byte[][] splitPoints = SaltingUtil.getSalteByteSplitPoints(nSaltBuckets);
            admin.createTable(desc, splitPoints);
            restoreSequenceSnapshot(admin, conn);
            success = true;
            LOGGER.warn("Completed pre-splitting SYSTEM.SEQUENCE table");
        } catch (IOException e) {
            throw new SQLException("Unable to pre-split SYSTEM.SEQUENCE table", e);
        } finally {
            try {
                if (snapshotCreated && success) {
                    try {
                        deleteSequenceSnapshot(admin);
                    } catch (SQLException e) {
                        LOGGER.warn("Exception while deleting SYSTEM.SEQUENCE snapshot during pre-split", e);
                    }
                }
            } finally {
                try {
                    admin.close();
                } catch (IOException e) {
                    LOGGER.warn("Exception while closing admin during pre-split", e);
                }
            }
        }
    }

    public static PhoenixConnection upgradeLocalIndexes(PhoenixConnection metaConnection)
            throws SQLException, IOException, org.apache.hadoop.hbase.TableNotFoundException {
        Properties props = PropertiesUtil.deepCopy(metaConnection.getClientInfo());
        Long originalScn = null;
        String str = props.getProperty(PhoenixRuntime.CURRENT_SCN_ATTRIB);
        if (str != null) {
            originalScn = Long.valueOf(str);
        }
        props.setProperty(PhoenixRuntime.CURRENT_SCN_ATTRIB, Long.toString(HConstants.LATEST_TIMESTAMP));
        PhoenixConnection globalConnection = null;
        PhoenixConnection toReturn = null;
        globalConnection = new PhoenixConnection(metaConnection, metaConnection.getQueryServices(), props);
        SQLException sqlEx = null;
        try (Admin admin = globalConnection.getQueryServices().getAdmin()) {
            ResultSet rs = globalConnection.createStatement().executeQuery("SELECT TABLE_SCHEM, TABLE_NAME, DATA_TABLE_NAME, TENANT_ID, MULTI_TENANT, SALT_BUCKETS FROM SYSTEM.CATALOG  "
                    + "      WHERE COLUMN_NAME IS NULL"
                    + "           AND COLUMN_FAMILY IS NULL"
                    + "           AND INDEX_TYPE=" + IndexType.LOCAL.getSerializedValue());
            boolean droppedLocalIndexes = false;
            while (rs.next()) {
                if(!droppedLocalIndexes) {
                    TableDescriptor[] localIndexTables = admin.listTables(MetaDataUtil.LOCAL_INDEX_TABLE_PREFIX+".*");
                    String localIndexSplitter = LocalIndexSplitter.class.getName();
                    for (TableDescriptor table : localIndexTables) {
                        TableDescriptor dataTableDesc = admin.getDescriptor(TableName.valueOf(MetaDataUtil.getLocalIndexUserTableName(table.getTableName().getNameAsString())));
                        TableDescriptorBuilder dataTableDescBuilder = TableDescriptorBuilder.newBuilder(dataTableDesc);
                        ColumnFamilyDescriptor[] columnFamilies = dataTableDesc.getColumnFamilies();
                        boolean modifyTable = false;
                        for(ColumnFamilyDescriptor cf : columnFamilies) {
                            String localIndexCf = QueryConstants.LOCAL_INDEX_COLUMN_FAMILY_PREFIX+cf.getNameAsString();
                            if(dataTableDesc.getColumnFamily(Bytes.toBytes(localIndexCf))==null){
                                ColumnFamilyDescriptorBuilder colDefBuilder =
                                        ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes(localIndexCf));
                                for(Entry<Bytes, Bytes> keyValue: cf.getValues().entrySet()){
                                    colDefBuilder.setValue(keyValue.getKey().copyBytes(), keyValue.getValue().copyBytes());
                                }
                                dataTableDescBuilder.addColumnFamily(colDefBuilder.build());
                                modifyTable = true;
                            }
                        }
                        Collection<String> coprocessors = dataTableDesc.getCoprocessors();
                        for(String coprocessor:  coprocessors) {
                            if(coprocessor.equals(localIndexSplitter)) {
                                dataTableDescBuilder.removeCoprocessor(localIndexSplitter);
                                modifyTable = true;
                            }
                        }
                        if(modifyTable) {
                            admin.modifyTable(dataTableDescBuilder.build());
                        }
                    }
                    admin.disableTables(MetaDataUtil.LOCAL_INDEX_TABLE_PREFIX+".*");
                    admin.deleteTables(MetaDataUtil.LOCAL_INDEX_TABLE_PREFIX+".*");
                    droppedLocalIndexes = true;
                }
                String schemaName = rs.getString(1);
                String indexTableName = rs.getString(2);
                String dataTableName = rs.getString(3);
                String tenantId = rs.getString(4);
                boolean multiTenantTable = rs.getBoolean(5);
                int numColumnsToSkip = 1 + (multiTenantTable ? 1 : 0);
                String getColumns =
                        "SELECT COLUMN_NAME, COLUMN_FAMILY FROM SYSTEM.CATALOG  WHERE TABLE_SCHEM "
                                + (schemaName == null ? "IS NULL " : "='" + schemaName+ "'")
                                + " AND TENANT_ID "+(tenantId == null ? "IS NULL " : "='" + tenantId + "'")
                                + " and TABLE_NAME='" + indexTableName
                                + "' AND COLUMN_NAME IS NOT NULL AND KEY_SEQ > "+ numColumnsToSkip +" ORDER BY KEY_SEQ";
                ResultSet getColumnsRs = globalConnection.createStatement().executeQuery(getColumns);
                List<String> indexedColumns = new ArrayList<String>(1);
                List<String> coveredColumns = new ArrayList<String>(1);
                
                while (getColumnsRs.next()) {
                    String column = getColumnsRs.getString(1);
                    String columnName = IndexUtil.getDataColumnName(column);
                    String columnFamily = IndexUtil.getDataColumnFamilyName(column);
                    if (getColumnsRs.getString(2) == null) {
                        if (columnFamily != null && !columnFamily.isEmpty()) {
                            if (SchemaUtil.normalizeIdentifier(columnFamily).equals(QueryConstants.DEFAULT_COLUMN_FAMILY)) {
                                indexedColumns.add(columnName);
                            } else {
                                indexedColumns.add(SchemaUtil.getCaseSensitiveColumnDisplayName(
                                    columnFamily, columnName));
                            }
                        } else {
                            indexedColumns.add(columnName);
                        }
                    } else {
                        coveredColumns.add(SchemaUtil.normalizeIdentifier(columnFamily)
                                .equals(QueryConstants.DEFAULT_COLUMN_FAMILY) ? columnName
                                : SchemaUtil.getCaseSensitiveColumnDisplayName(
                                    columnFamily, columnName));
                    }
                }
                StringBuilder createIndex = new StringBuilder("CREATE LOCAL INDEX ");
                createIndex.append(indexTableName);
                createIndex.append(" ON ");
                createIndex.append(SchemaUtil.getTableName(schemaName, dataTableName));
                createIndex.append("(");
                for (int i = 0; i < indexedColumns.size(); i++) {
                    createIndex.append(indexedColumns.get(i));
                    if (i < indexedColumns.size() - 1) {
                        createIndex.append(",");
                    }
                }
                createIndex.append(")");
               
                if (!coveredColumns.isEmpty()) {
                    createIndex.append(" INCLUDE(");
                    for (int i = 0; i < coveredColumns.size(); i++) {
                        createIndex.append(coveredColumns.get(i));
                        if (i < coveredColumns.size() - 1) {
                            createIndex.append(",");
                        }
                    }
                    createIndex.append(")");
                }
                createIndex.append(" ASYNC");
                LOGGER.info("Index creation query is : " + createIndex.toString());
                LOGGER.info("Dropping the index " + indexTableName
                    + " to clean up the index details from SYSTEM.CATALOG.");
                PhoenixConnection localConnection = null;
                if (tenantId != null) {
                    props.setProperty(PhoenixRuntime.TENANT_ID_ATTRIB, tenantId);
                    localConnection = new PhoenixConnection(globalConnection, globalConnection.getQueryServices(), props);
                }
                try {
                    (localConnection == null ? globalConnection : localConnection).createStatement().execute(
                        "DROP INDEX IF EXISTS " + indexTableName + " ON "
                                + SchemaUtil.getTableName(schemaName, dataTableName));
                    LOGGER.info("Recreating the index " + indexTableName);
                    (localConnection == null ? globalConnection : localConnection).createStatement().execute(createIndex.toString());
                    LOGGER.info("Created the index " + indexTableName);
                } finally {
                    props.remove(PhoenixRuntime.TENANT_ID_ATTRIB);
                    if (localConnection != null) {
                        sqlEx = closeConnection(localConnection, sqlEx);
                        if (sqlEx != null) {
                            throw sqlEx;
                        }
                    }
                }
            }
            globalConnection.createStatement().execute("DELETE FROM SYSTEM.CATALOG WHERE SUBSTR(TABLE_NAME,0,11)='"+MetaDataUtil.LOCAL_INDEX_TABLE_PREFIX+"'");
            if (originalScn != null) {
                props.setProperty(PhoenixRuntime.CURRENT_SCN_ATTRIB, Long.toString(originalScn));
            }
            toReturn = new PhoenixConnection(globalConnection, globalConnection.getQueryServices(), props);
        } catch (SQLException e) {
            sqlEx = e;
        } finally {
            sqlEx = closeConnection(metaConnection, sqlEx);
            sqlEx = closeConnection(globalConnection, sqlEx);
            if (sqlEx != null) {
                throw sqlEx;
            }
        }
        return toReturn;
    }

    public static PhoenixConnection disableViewIndexes(PhoenixConnection connParam) throws SQLException, IOException, InterruptedException, TimeoutException {
        Properties props = PropertiesUtil.deepCopy(connParam.getClientInfo());
        Long originalScn = null;
        String str = props.getProperty(PhoenixRuntime.CURRENT_SCN_ATTRIB);
        if (str != null) {
            originalScn = Long.valueOf(str);
        }
        // don't use the passed timestamp as scn because we want to query all view indexes up to now.
        props.setProperty(PhoenixRuntime.CURRENT_SCN_ATTRIB, Long.toString(HConstants.LATEST_TIMESTAMP));
        Set<String> physicalTables = new HashSet<>();
        SQLException sqlEx = null;
        PhoenixConnection globalConnection = null;
        PhoenixConnection toReturn = null;
        try {
            globalConnection = new PhoenixConnection(connParam, connParam.getQueryServices(), props);
            String tenantId = null;
            try (Admin admin = globalConnection.getQueryServices().getAdmin()) {
                String fetchViewIndexes = "SELECT " + TENANT_ID + ", " + TABLE_SCHEM + ", " + TABLE_NAME + 
                        ", " + DATA_TABLE_NAME + " FROM " + SYSTEM_CATALOG_NAME + " WHERE " + VIEW_INDEX_ID
                        + " IS NOT NULL";
                String disableIndexDDL = "ALTER INDEX %s ON %s DISABLE"; 
                try (ResultSet rs = globalConnection.createStatement().executeQuery(fetchViewIndexes)) {
                    while (rs.next()) {
                        tenantId = rs.getString(1);
                        String indexSchema = rs.getString(2);
                        String indexName = rs.getString(3);
                        String viewName = rs.getString(4);
                        String fullIndexName = SchemaUtil.getTableName(indexSchema, indexName);
                        String fullViewName = SchemaUtil.getTableName(indexSchema, viewName);
                        PTable viewPTable = null;
                        // Disable the view index and truncate the underlying hbase table. 
                        // Users would need to rebuild the view indexes. 
                        if (tenantId != null && !tenantId.isEmpty()) {
                            Properties newProps = PropertiesUtil.deepCopy(globalConnection.getClientInfo());
                            newProps.setProperty(PhoenixRuntime.TENANT_ID_ATTRIB, tenantId);
                            PTable indexPTable = null;
                            try (PhoenixConnection tenantConnection = new PhoenixConnection(globalConnection, globalConnection.getQueryServices(), newProps)) {
                                viewPTable = PhoenixRuntime.getTable(tenantConnection, fullViewName);
                                tenantConnection.createStatement().execute(String.format(disableIndexDDL, indexName, fullViewName));
                                indexPTable = PhoenixRuntime.getTable(tenantConnection, fullIndexName);
                            }

                            int offset = indexPTable.getBucketNum() != null ? 1 : 0;
                            int existingTenantIdPosition = ++offset; // positions are stored 1 based
                            int existingViewIdxIdPosition = ++offset;
                            int newTenantIdPosition = existingViewIdxIdPosition;
                            int newViewIdxPosition = existingTenantIdPosition;
                            String tenantIdColumn = indexPTable.getColumns().get(existingTenantIdPosition - 1).getName().getString();
                            int index = 0;
                            String updatePosition =
                                    "UPSERT INTO "
                                            + SYSTEM_CATALOG_NAME
                                            + " ( "
                                            + TENANT_ID
                                            + ","
                                            + TABLE_SCHEM
                                            + ","
                                            + TABLE_NAME
                                            + ","
                                            + COLUMN_NAME
                                            + ","
                                            + COLUMN_FAMILY
                                            + ","
                                            + ORDINAL_POSITION
                                            + ") SELECT "
                                            + TENANT_ID
                                            + ","
                                            + TABLE_SCHEM
                                            + ","
                                            + TABLE_NAME
                                            + ","
                                            + COLUMN_NAME
                                            + ","
                                            + COLUMN_FAMILY
                                            + ","
                                            + "?"
                                            + " FROM "
                                            + SYSTEM_CATALOG_NAME
                                            + " WHERE "
                                            + TENANT_ID
                                            + " = ? "
                                            + " AND "
                                            + TABLE_NAME
                                            + " = ? "
                                            + " AND "
                                            + (indexSchema == null ? TABLE_SCHEM + " IS NULL" : TABLE_SCHEM + " = ? ") 
                                            + " AND "
                                            + COLUMN_NAME 
                                            + " = ? ";
                            // update view index position
                            try (PreparedStatement s = globalConnection.prepareStatement(updatePosition)) {
                                index = 0;
                                s.setInt(++index, newViewIdxPosition);
                                s.setString(++index, tenantId);
                                s.setString(++index, indexName);
                                if (indexSchema != null) {
                                    s.setString(++index, indexSchema);
                                }
                                s.setString(++index, MetaDataUtil.getViewIndexIdColumnName());
                                s.executeUpdate();
                            }
                            // update tenant id position
                            try (PreparedStatement s = globalConnection.prepareStatement(updatePosition)) {
                                index = 0;
                                s.setInt(++index, newTenantIdPosition);
                                s.setString(++index, tenantId);
                                s.setString(++index, indexName);
                                if (indexSchema != null) {
                                    s.setString(++index, indexSchema);
                                }
                                s.setString(++index, tenantIdColumn);
                                s.executeUpdate();
                            }
                            globalConnection.commit();
                        } else {
                            viewPTable = PhoenixRuntime.getTable(globalConnection, fullViewName);
                            globalConnection.createStatement().execute(String.format(disableIndexDDL, indexName, fullViewName));
                        }
                        String indexPhysicalTableName = MetaDataUtil.getViewIndexPhysicalName(viewPTable.getPhysicalName().getString());
                        if (physicalTables.add(indexPhysicalTableName)) {
                            final TableName tableName = TableName.valueOf(indexPhysicalTableName);
                            if(admin.tableExists(tableName)) {
                                admin.disableTable(tableName);
                                admin.truncateTable(tableName, false);
                            }
                        }
                    }
                }
            }
            if (originalScn != null) {
                props.setProperty(PhoenixRuntime.CURRENT_SCN_ATTRIB, Long.toString(originalScn));
            }
            toReturn = new PhoenixConnection(globalConnection, globalConnection.getQueryServices(), props);
        } catch (SQLException e) {
            sqlEx = e;
        } finally {
            sqlEx = closeConnection(connParam, sqlEx);
            sqlEx = closeConnection(globalConnection, sqlEx);
            if (sqlEx != null) {
                throw sqlEx;
            }
        }
        return toReturn;
    }
    
    
    public static SQLException closeConnection(PhoenixConnection conn, SQLException sqlEx) {
        SQLException toReturn = sqlEx;
        try {
            conn.close();
        } catch (SQLException e) {
            if (toReturn != null) {
                toReturn.setNextException(e);
            } else {
                toReturn = e;
            }
        }
        return toReturn;
    }
    @SuppressWarnings("deprecation")
    public static boolean upgradeSequenceTable(PhoenixConnection conn, int nSaltBuckets, PTable oldTable) throws SQLException {
        LOGGER.info("Upgrading SYSTEM.SEQUENCE table");

        byte[] seqTableKey = SchemaUtil.getTableKey(null, PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_SCHEMA, PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_TABLE);
        Table sysTable = conn.getQueryServices().getTable(PhoenixDatabaseMetaData.SYSTEM_CATALOG_NAME_BYTES);
        try {
            LOGGER.info("Setting SALT_BUCKETS property of SYSTEM.SEQUENCE to " + SaltingUtil.MAX_BUCKET_NUM);
            Cell saltKV = PhoenixKeyValueUtil.newKeyValue(seqTableKey, 
                    PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES,
                    PhoenixDatabaseMetaData.SALT_BUCKETS_BYTES,
                    MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP,
                    PInteger.INSTANCE.toBytes(nSaltBuckets));
            Put saltPut = new Put(seqTableKey);
            saltPut.add(saltKV);
            // Prevent multiple clients from doing this upgrade
            if (!sysTable.checkAndPut(seqTableKey,
                    PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES,
                    PhoenixDatabaseMetaData.SALT_BUCKETS_BYTES, null, saltPut)) {
                if (oldTable == null) { // Unexpected, but to be safe just run pre-split code
                    preSplitSequenceTable(conn, nSaltBuckets);
                    return true;
                }
                // If upgrading from 4.2.0, then we need this special case of pre-splitting the table.
                // This is needed as a fix for https://issues.apache.org/jira/browse/PHOENIX-1401 
                if (oldTable.getTimeStamp() == MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP_4_2_0) {
                    byte[] oldSeqNum = PLong.INSTANCE.toBytes(oldTable.getSequenceNumber());
                    Cell seqNumKV = PhoenixKeyValueUtil.newKeyValue(seqTableKey, 
                            PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES,
                            PhoenixDatabaseMetaData.TABLE_SEQ_NUM_BYTES,
                            MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP,
                            PLong.INSTANCE.toBytes(MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP));
                    Put seqNumPut = new Put(seqTableKey);
                    seqNumPut.add(seqNumKV);
                    // Increment TABLE_SEQ_NUM in checkAndPut as semaphore so that only single client
                    // pre-splits the sequence table.
                    if (sysTable.checkAndPut(seqTableKey,
                            PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES,
                            PhoenixDatabaseMetaData.TABLE_SEQ_NUM_BYTES, oldSeqNum, seqNumPut)) {
                        preSplitSequenceTable(conn, nSaltBuckets);
                        return true;
                    }
                }
                LOGGER.info("SYSTEM.SEQUENCE table has already been upgraded");
                return false;
            }
            
            // if the SYSTEM.SEQUENCE table is at 4.1.0 or before then we need to salt the table
            // and pre-split it.
            if (oldTable.getTimeStamp() <= MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP_4_1_0) {
                int batchSizeBytes = 100 * 1024; // 100K chunks
                int sizeBytes = 0;
                List<Mutation> mutations =  Lists.newArrayListWithExpectedSize(10000);

                boolean success = false;
                Scan scan = new Scan();
                scan.setRaw(true);
                scan.setMaxVersions();
                Table seqTable = conn.getQueryServices().getTable(PhoenixDatabaseMetaData.SYSTEM_SEQUENCE_NAME_BYTES);
                try {
                    boolean committed = false;
                    LOGGER.info("Adding salt byte to all SYSTEM.SEQUENCE rows");
                    ResultScanner scanner = seqTable.getScanner(scan);
                    try {
                        Result result;
                        while ((result = scanner.next()) != null) {
                            for (Cell keyValue : result.rawCells()) {
                                KeyValue newKeyValue = addSaltByte(keyValue, nSaltBuckets);
                                if (newKeyValue != null) {
                                    sizeBytes += newKeyValue.getLength();
                                    if (KeyValue.Type.codeToType(newKeyValue.getTypeByte()) == KeyValue.Type.Put) {
                                        // Delete old value
                                        byte[] buf = keyValue.getRowArray();
                                        Delete delete = new Delete(keyValue.getRowArray(), keyValue.getRowOffset(), keyValue.getRowLength());
                                        KeyValue deleteKeyValue = new KeyValue(buf, keyValue.getRowOffset(), keyValue.getRowLength(),
                                                buf, keyValue.getFamilyOffset(), keyValue.getFamilyLength(),
                                                buf, keyValue.getQualifierOffset(), keyValue.getQualifierLength(),
                                                keyValue.getTimestamp(), KeyValue.Type.Delete,
                                                ByteUtil.EMPTY_BYTE_ARRAY,0,0);
                                        delete.addDeleteMarker(deleteKeyValue);
                                        mutations.add(delete);
                                        sizeBytes += deleteKeyValue.getLength();
                                        // Put new value
                                        Put put = new Put(newKeyValue.getRowArray(), newKeyValue.getRowOffset(), newKeyValue.getRowLength());
                                        put.add(newKeyValue);
                                        mutations.add(put);
                                    } else if (KeyValue.Type.codeToType(newKeyValue.getTypeByte()) == KeyValue.Type.Delete){
                                        // Copy delete marker using new key so that it continues
                                        // to delete the key value preceding it that will be updated
                                        // as well.
                                        Delete delete = new Delete(newKeyValue.getRowArray(), newKeyValue.getRowOffset(), newKeyValue.getRowLength());
                                        delete.addDeleteMarker(newKeyValue);
                                        mutations.add(delete);
                                    }
                                }
                                if (sizeBytes >= batchSizeBytes) {
                                    LOGGER.info("Committing bactch of SYSTEM.SEQUENCE rows");
                                    seqTable.batch(mutations, null);
                                    mutations.clear();
                                    sizeBytes = 0;
                                    committed = true;
                                }
                            }
                        }
                        if (!mutations.isEmpty()) {
                            LOGGER.info("Committing last bactch of SYSTEM.SEQUENCE rows");
                            seqTable.batch(mutations, null);
                        }
                        preSplitSequenceTable(conn, nSaltBuckets);
                        LOGGER.info("Successfully completed upgrade of SYSTEM.SEQUENCE");
                        success = true;
                        return true;
                    } catch (InterruptedException e) {
                        throw ServerUtil.parseServerException(e);
                    } finally {
                        try {
                            scanner.close();
                        } finally {
                            if (!success) {
                                if (!committed) { // Try to recover by setting salting back to off, as we haven't successfully committed anything
                                    // Don't use Delete here as we'd never be able to change it again at this timestamp.
                                    Cell unsaltKV = PhoenixKeyValueUtil.newKeyValue(seqTableKey, 
                                            PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES,
                                            PhoenixDatabaseMetaData.SALT_BUCKETS_BYTES,
                                            MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP,
                                            PInteger.INSTANCE.toBytes(0));
                                    Put unsaltPut = new Put(seqTableKey);
                                    unsaltPut.add(unsaltKV);
                                    try {
                                        sysTable.put(unsaltPut);
                                        success = true;
                                    } finally {
                                        if (!success) LOGGER.error("SYSTEM.SEQUENCE TABLE LEFT IN CORRUPT STATE");
                                    }
                                } else { // We're screwed b/c we've already committed some salted sequences...
                                    LOGGER.error("SYSTEM.SEQUENCE TABLE LEFT IN CORRUPT STATE");
                                }
                            }
                        }
                    }
                } catch (IOException e) {
                    throw ServerUtil.parseServerException(e);
                } finally {
                    try {
                        seqTable.close();
                    } catch (IOException e) {
                        LOGGER.warn("Exception during close",e);
                    }
                }
            }
            return false;
        } catch (IOException e) {
            throw ServerUtil.parseServerException(e);
        } finally {
            try {
                sysTable.close();
            } catch (IOException e) {
                LOGGER.warn("Exception during close",e);
            }
        }
        
    }
    
    @SuppressWarnings("deprecation")
    private static KeyValue addSaltByte(Cell keyValue, int nSaltBuckets) {
        byte[] buf = keyValue.getRowArray();
        int length = keyValue.getRowLength();
        int offset = keyValue.getRowOffset();
        boolean isViewSeq = length > SEQ_PREFIX_BYTES.length && Bytes.compareTo(SEQ_PREFIX_BYTES, 0, SEQ_PREFIX_BYTES.length, buf, offset, SEQ_PREFIX_BYTES.length) == 0;
        if (!isViewSeq && nSaltBuckets == 0) {
            return null;
        }
        byte[] newBuf;
        if (isViewSeq) { // We messed up the name for the sequences for view indexes so we'll take this opportunity to fix it
            if (buf[length-1] == 0) { // Global indexes on views have trailing null byte
                length--;
            }
            byte[][] rowKeyMetaData = new byte[3][];
            SchemaUtil.getVarChars(buf, offset, length, 0, rowKeyMetaData);
            byte[] schemaName = rowKeyMetaData[PhoenixDatabaseMetaData.SCHEMA_NAME_INDEX];
            byte[] unprefixedSchemaName = new byte[schemaName.length - MetaDataUtil.VIEW_INDEX_SEQUENCE_PREFIX_BYTES.length];
            System.arraycopy(schemaName, MetaDataUtil.VIEW_INDEX_SEQUENCE_PREFIX_BYTES.length, unprefixedSchemaName, 0, unprefixedSchemaName.length);
            byte[] tableName = rowKeyMetaData[PhoenixDatabaseMetaData.TABLE_NAME_INDEX];
            PName physicalName = PNameFactory.newName(unprefixedSchemaName);
            // Reformulate key based on correct data
            newBuf = MetaDataUtil.getViewIndexSequenceKey(tableName == null ? null : Bytes.toString(tableName),
                    physicalName, nSaltBuckets, false).getKey();
        } else {
            newBuf = new byte[length + 1];
            System.arraycopy(buf, offset, newBuf, SaltingUtil.NUM_SALTING_BYTES, length);
            newBuf[0] = SaltingUtil.getSaltingByte(newBuf, SaltingUtil.NUM_SALTING_BYTES, length, nSaltBuckets);
        }
        return new KeyValue(newBuf, 0, newBuf.length,
                buf, keyValue.getFamilyOffset(), keyValue.getFamilyLength(),
                buf, keyValue.getQualifierOffset(), keyValue.getQualifierLength(),
                keyValue.getTimestamp(), KeyValue.Type.codeToType(keyValue.getTypeByte()),
                buf, keyValue.getValueOffset(), keyValue.getValueLength());
    }
    
    /**
     * Upgrade the metadata in the catalog table to enable adding columns to tables with views
     * @param oldMetaConnection caller should take care of closing the passed connection appropriately
     * @throws SQLException
     */
    public static void upgradeTo4_5_0(PhoenixConnection oldMetaConnection) throws SQLException {
        PhoenixConnection metaConnection = null;
        try {
            // Need to use own connection with max time stamp to be able to read all data from SYSTEM.CATALOG 
            metaConnection = new PhoenixConnection(oldMetaConnection, HConstants.LATEST_TIMESTAMP);
            LOGGER.info("Upgrading metadata to support adding columns to tables with views");
            String getBaseTableAndViews = "SELECT "
                    + COLUMN_FAMILY + " AS BASE_PHYSICAL_TABLE, "
                    + TENANT_ID + ", "
                    + TABLE_SCHEM + " AS VIEW_SCHEMA, "
                    + TABLE_NAME + " AS VIEW_NAME "
                    + "FROM " + SYSTEM_CATALOG_NAME 
                    + " WHERE " + COLUMN_FAMILY + " IS NOT NULL " // column_family column points to the physical table name.
                    + " AND " + COLUMN_NAME + " IS NULL "
                    + " AND " + LINK_TYPE + " = ? ";
            // Build a map of base table name -> list of views on the table. 
            Map<String, List<ViewKey>> parentTableViewsMap = new HashMap<>();
            try (PreparedStatement stmt = metaConnection.prepareStatement(getBaseTableAndViews)) {
                // Get back view rows that have links back to the base physical table. This takes care
                // of cases when we have a hierarchy of views too.
                stmt.setByte(1, LinkType.PHYSICAL_TABLE.getSerializedValue());
                try (ResultSet rs = stmt.executeQuery()) {
                    while (rs.next()) {
                        // this is actually SCHEMANAME.TABLENAME
                        String parentTable = rs.getString("BASE_PHYSICAL_TABLE");
                        String tenantId = rs.getString(TENANT_ID);
                        String viewSchema = rs.getString("VIEW_SCHEMA");
                        String viewName = rs.getString("VIEW_NAME");
                        List<ViewKey> viewKeysList = parentTableViewsMap.get(parentTable);
                        if (viewKeysList == null) {
                            viewKeysList = new ArrayList<>();
                            parentTableViewsMap.put(parentTable, viewKeysList);
                        }
                        viewKeysList.add(new ViewKey(tenantId, viewSchema, viewName));
                    }
                }
            }
            boolean clearCache = false;
            for (Entry<String, List<ViewKey>> entry : parentTableViewsMap.entrySet()) {
                // Fetch column information for the base physical table
                String physicalTable = entry.getKey();
                String baseTableSchemaName = SchemaUtil.getSchemaNameFromFullName(physicalTable).equals(StringUtil.EMPTY_STRING) ? null : SchemaUtil.getSchemaNameFromFullName(physicalTable);
                String baseTableName = SchemaUtil.getTableNameFromFullName(physicalTable);
                List<ColumnDetails> basePhysicalTableColumns = new ArrayList<>(); 

                // Columns fetched in order of ordinal position
                String fetchColumnInfoForBasePhysicalTable = "SELECT " +
                        COLUMN_NAME + "," +
                        COLUMN_FAMILY + "," +
                        DATA_TYPE + "," +
                        COLUMN_SIZE + "," +
                        DECIMAL_DIGITS + "," +
                        ORDINAL_POSITION + "," +
                        SORT_ORDER + "," +
                        ARRAY_SIZE + " " +
                        "FROM SYSTEM.CATALOG " +
                        "WHERE " +
                        "TABLE_SCHEM %s " +
                        "AND TABLE_NAME = ? " +
                        "AND COLUMN_NAME IS NOT NULL " +
                        "AND LINK_TYPE IS NULL " +
                        "ORDER BY " + 
                        ORDINAL_POSITION;

                PreparedStatement stmt = null;
                if (baseTableSchemaName == null) {
                    fetchColumnInfoForBasePhysicalTable =
                            String.format(fetchColumnInfoForBasePhysicalTable, "IS NULL ");
                    stmt = metaConnection.prepareStatement(fetchColumnInfoForBasePhysicalTable);
                    stmt.setString(1, baseTableName);
                } else {
                    fetchColumnInfoForBasePhysicalTable =
                            String.format(fetchColumnInfoForBasePhysicalTable, " = ? ");
                    stmt = metaConnection.prepareStatement(fetchColumnInfoForBasePhysicalTable);
                    stmt.setString(1, baseTableSchemaName);
                    stmt.setString(2, baseTableName);
                }

                try (ResultSet rs = stmt.executeQuery()) {
                    while (rs.next()) {
                        basePhysicalTableColumns.add(new ColumnDetails(rs.getString(COLUMN_FAMILY), rs
                                .getString(COLUMN_NAME), rs.getInt(ORDINAL_POSITION), rs
                                .getInt(DATA_TYPE), rs.getInt(COLUMN_SIZE), rs.getInt(DECIMAL_DIGITS),
                                rs.getInt(SORT_ORDER), rs.getInt(ARRAY_SIZE)));
                    }
                }

                // Fetch column information for all the views on the base physical table ordered by ordinal position.
                List<ViewKey> viewKeys = entry.getValue();
                StringBuilder sb = new StringBuilder();
                sb.append("SELECT " + 
                        TENANT_ID + "," +
                        TABLE_SCHEM + "," +
                        TABLE_NAME + "," +
                        COLUMN_NAME + "," +
                        COLUMN_FAMILY + "," +
                        DATA_TYPE + "," +
                        COLUMN_SIZE + "," +
                        DECIMAL_DIGITS + "," +
                        ORDINAL_POSITION + "," +
                        SORT_ORDER + "," +
                        ARRAY_SIZE + " " + 
                        "FROM SYSTEM.CATALOG " +
                        "WHERE " +
                        COLUMN_NAME + " IS NOT NULL " +
                        "AND " +
                        ORDINAL_POSITION + " <= ? " + // fetch only those columns that would impact setting of base column count
                        "AND " +
                        "(" + TENANT_ID+ ", " + TABLE_SCHEM + ", " + TABLE_NAME + ") IN (");

                int numViews = viewKeys.size();
                for (int i = 0; i < numViews; i++) {
                    sb.append(" (?, ?, ?) ");
                    if (i < numViews - 1) {
                        sb.append(", ");
                    }
                }
                sb.append(" ) ");
                sb.append(" GROUP BY " +
                        TENANT_ID + "," +
                        TABLE_SCHEM + "," +
                        TABLE_NAME + "," +
                        COLUMN_NAME + "," +
                        COLUMN_FAMILY + "," +
                        DATA_TYPE + "," +
                        COLUMN_SIZE + "," +
                        DECIMAL_DIGITS + "," +
                        ORDINAL_POSITION + "," +
                        SORT_ORDER + "," +
                        ARRAY_SIZE + " " + 
                        "ORDER BY " + 
                        TENANT_ID + "," + TABLE_SCHEM + ", " + TABLE_NAME + ", " + ORDINAL_POSITION);
                String fetchViewColumnsSql = sb.toString();
                stmt = metaConnection.prepareStatement(fetchViewColumnsSql);
                int numColsInBaseTable = basePhysicalTableColumns.size();
                stmt.setInt(1, numColsInBaseTable);
                int paramIndex = 1;
                stmt.setInt(paramIndex++, numColsInBaseTable);
                for (ViewKey view : viewKeys) {
                    stmt.setString(paramIndex++, view.tenantId);
                    stmt.setString(paramIndex++, view.schema);
                    stmt.setString(paramIndex++, view.name);
                }
                String currentTenantId = null;
                String currentViewSchema = null;
                String currentViewName = null;
                try (ResultSet rs = stmt.executeQuery()) {
                    int numBaseTableColsMatched = 0;
                    boolean ignore = false;
                    boolean baseColumnCountUpserted = false;
                    while (rs.next()) {
                        String viewTenantId = rs.getString(TENANT_ID);
                        String viewSchema = rs.getString(TABLE_SCHEM);
                        String viewName = rs.getString(TABLE_NAME);
                        if (!(Objects.equal(viewTenantId, currentTenantId) && Objects.equal(viewSchema, currentViewSchema) && Objects.equal(viewName, currentViewName))) {
                            // We are about to iterate through columns of a different view. Check whether base column count was upserted.
                            // If it wasn't then it is likely the case that a column inherited from the base table was dropped from view.
                            if (currentViewName != null && !baseColumnCountUpserted && numBaseTableColsMatched < numColsInBaseTable) {
                                upsertBaseColumnCountInHeaderRow(metaConnection, currentTenantId, currentViewSchema, currentViewName, DIVERGED_VIEW_BASE_COLUMN_COUNT);
                                clearCache = true;
                            }
                            // reset the values as we are now going to iterate over columns of a new view.
                            numBaseTableColsMatched = 0;
                            currentTenantId = viewTenantId;
                            currentViewSchema = viewSchema;
                            currentViewName = viewName;
                            ignore = false;
                            baseColumnCountUpserted = false;
                        }
                        if (!ignore) {
                            /*
                             * Iterate over all the columns of the base physical table and the columns of the view. Compare the
                             * two till one of the following happens: 
                             * 
                             * 1) We run into a view column which is different from column in the base physical table.
                             * This means that the view has diverged from the base physical table. In such a case
                             * we will set a special value for the base column count. That special value will also be used
                             * on the server side to filter out the diverged view so that meta-data changes on the base 
                             * physical table are not propagated to it.
                             * 
                             * 2) Every physical table column is present in the view. In that case we set the base column count
                             * as the number of columns in the base physical table. At that point we ignore rest of the columns
                             * of the view.
                             * 
                             */
                            ColumnDetails baseTableColumn = basePhysicalTableColumns.get(numBaseTableColsMatched);
                            String columName = rs.getString(COLUMN_NAME);
                            String columnFamily = rs.getString(COLUMN_FAMILY);
                            int ordinalPos = rs.getInt(ORDINAL_POSITION);
                            int dataType = rs.getInt(DATA_TYPE);
                            int columnSize = rs.getInt(COLUMN_SIZE);
                            int decimalDigits = rs.getInt(DECIMAL_DIGITS);
                            int sortOrder = rs.getInt(SORT_ORDER);
                            int arraySize = rs.getInt(ARRAY_SIZE);
                            ColumnDetails viewColumn = new ColumnDetails(columnFamily, columName, ordinalPos, dataType, columnSize, decimalDigits, sortOrder, arraySize);
                            if (baseTableColumn.equals(viewColumn)) {
                                numBaseTableColsMatched++;
                                if (numBaseTableColsMatched == numColsInBaseTable) {
                                    upsertBaseColumnCountInHeaderRow(metaConnection, viewTenantId, viewSchema, viewName, numColsInBaseTable);
                                    // No need to ignore the rest of the columns of the view here since the
                                    // query retrieved only those columns that had ordinal position <= numColsInBaseTable
                                    baseColumnCountUpserted = true;
                                    clearCache = true;
                                }
                            } else {
                                // special value to denote that the view has diverged from the base physical table.
                                upsertBaseColumnCountInHeaderRow(metaConnection, viewTenantId, viewSchema, viewName, DIVERGED_VIEW_BASE_COLUMN_COUNT);
                                baseColumnCountUpserted = true;
                                clearCache = true;
                                // ignore rest of the rows for the view.
                                ignore = true;
                            }
                        }
                    }
                }
                // set base column count for the header row of the base table too. We use this information
                // to figure out whether the upgrade is in progress or hasn't started.
                upsertBaseColumnCountInHeaderRow(metaConnection, null, baseTableSchemaName, baseTableName, BASE_TABLE_BASE_COLUMN_COUNT);
                metaConnection.commit();
            }
            // clear metadata cache on region servers to force loading of the latest metadata
            if (clearCache) {
                metaConnection.getQueryServices().clearCache();
            }
        } finally {
            if (metaConnection != null) {
                metaConnection.close();
            }
        }
    }
    
    /**
     * Upgrade the metadata in the catalog table to enable adding columns to tables with views
     * @param oldMetaConnection caller should take care of closing the passed connection appropriately
     * @throws SQLException
     */
    public static void addParentToChildLinks(PhoenixConnection oldMetaConnection) throws SQLException {
        PhoenixConnection metaConnection = null;
        try {
            // Need to use own connection with max time stamp to be able to read all data from SYSTEM.CATALOG 
            metaConnection = new PhoenixConnection(oldMetaConnection, HConstants.LATEST_TIMESTAMP);
            LOGGER.info("Upgrading metadata to add parent to child links for views");
            metaConnection.commit();
            //     physical table 
            //         |  
            //     child view    
            //         |
            //     grand child view
            // Create parent table to child view CHILD link. As the PARENT link from child view to physical table is not there (it gets overwritten with the PHYSICAL link) use the PHYSICAL link instead.
            // We need to filter out grand child views PHYSICAL links while running this query
            String createChildLink = "UPSERT INTO SYSTEM.CATALOG(TENANT_ID,TABLE_SCHEM,TABLE_NAME,COLUMN_NAME,COLUMN_FAMILY,LINK_TYPE)" +
                                        "SELECT PARENT_TENANT_ID," + 
                                        "       CASE INSTR(COLUMN_FAMILY,'.')" +
                                        "              WHEN 0 THEN NULL" + 
                                        "              ELSE REGEXP_SUBSTR(COLUMN_FAMILY,'[^\\.]+')" + 
                                        "       END AS PARENT_SCHEMA," + 
                                        "       CASE INSTR(COLUMN_FAMILY,'.')" + 
                                        "              WHEN 0 THEN COLUMN_FAMILY" + 
                                        "              ELSE SUBSTR(COLUMN_FAMILY,INSTR(COLUMN_FAMILY,'.')+1)" + 
                                        "       END AS PARENT_TABLE," + 
                                        "       TENANT_ID," + 
                                        "       CASE WHEN TABLE_SCHEM IS NULL THEN TABLE_NAME" + 
                                        "            ELSE TABLE_SCHEM||'.'||TABLE_NAME" + 
                                        "       END AS VIEW_NAME," + 
                                        "       4 AS LINK_TYPE " + 
                                        "FROM SYSTEM.CATALOG(PARENT_TENANT_ID VARCHAR)" + 
                                        "WHERE LINK_TYPE = 2 " +
                                        "AND TABLE_TYPE IS NULL " +
                                        "AND (TENANT_ID, TABLE_SCHEM, TABLE_NAME) NOT IN (   " +
                                        "       SELECT TENANT_ID, " +
                                        "              TABLE_SCHEM, " +
                                        "              TABLE_NAME " +
                                        "       FROM   SYSTEM.CATALOG " +
                                        "       WHERE  LINK_TYPE = 3 )";
            metaConnection.createStatement().execute(createChildLink);
            metaConnection.commit();
            // Create child view to grand child view CHILD link using grand child view to child view PARENT link.
            String createGrandChildLink = "UPSERT INTO SYSTEM.CATALOG(TENANT_ID,TABLE_SCHEM,TABLE_NAME,COLUMN_NAME,COLUMN_FAMILY,LINK_TYPE)" +
                                        "SELECT PARENT_TENANT_ID," + 
                                        "       CASE INSTR(COLUMN_FAMILY,'.')" +
                                        "              WHEN 0 THEN NULL" + 
                                        "              ELSE REGEXP_SUBSTR(COLUMN_FAMILY,'[^\\.]+')" + 
                                        "       END AS PARENT_SCHEMA," + 
                                        "       CASE INSTR(COLUMN_FAMILY,'.')" + 
                                        "              WHEN 0 THEN COLUMN_FAMILY" + 
                                        "              ELSE SUBSTR(COLUMN_FAMILY,INSTR(COLUMN_FAMILY,'.')+1)" + 
                                        "       END AS PARENT_TABLE," + 
                                        "       TENANT_ID," + 
                                        "       CASE WHEN TABLE_SCHEM IS NULL THEN TABLE_NAME" + 
                                        "            ELSE TABLE_SCHEM||'.'||TABLE_NAME" + 
                                        "       END AS VIEW_NAME," + 
                                        "       4 AS LINK_TYPE " + 
                                        "FROM SYSTEM.CATALOG(PARENT_TENANT_ID VARCHAR)" + 
                                        "WHERE LINK_TYPE = 3 ";
            metaConnection.createStatement().execute(createGrandChildLink);
            metaConnection.commit();
            metaConnection.getQueryServices().clearCache();
        } finally {
            if (metaConnection != null) {
                metaConnection.close();
            }
        }
    }
    
    /**
     * Move child links form SYSTEM.CATALOG to SYSTEM.CHILD_LINK
     * @param oldMetaConnection caller should take care of closing the passed connection appropriately
     * @throws SQLException
     */
    public static void moveChildLinks(PhoenixConnection oldMetaConnection) throws SQLException {
        PhoenixConnection metaConnection = null;
        try {
            // Need to use own connection with max time stamp to be able to read all data from SYSTEM.CATALOG 
            metaConnection = new PhoenixConnection(oldMetaConnection, HConstants.LATEST_TIMESTAMP);
            LOGGER.info("Upgrading metadata to add parent to child links for views");
            metaConnection.commit();
            String createChildLink = "UPSERT INTO SYSTEM.CHILD_LINK(TENANT_ID, TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, COLUMN_FAMILY, LINK_TYPE) " +
                                        "SELECT TENANT_ID, TABLE_SCHEM, TABLE_NAME, COLUMN_NAME, COLUMN_FAMILY, LINK_TYPE " + 
                                        "FROM SYSTEM.CATALOG " + 
                                        "WHERE LINK_TYPE = 4";
            metaConnection.createStatement().execute(createChildLink);
            metaConnection.commit();
            String deleteChildLink = "DELETE FROM SYSTEM.CATALOG WHERE LINK_TYPE = 4 ";
            metaConnection.createStatement().execute(deleteChildLink);
            metaConnection.commit();
            metaConnection.getQueryServices().clearCache();
        } finally {
            if (metaConnection != null) {
                metaConnection.close();
            }
        }
    }
    
    public static void addViewIndexToParentLinks(PhoenixConnection oldMetaConnection) throws SQLException {
    	// Need to use own connection with max time stamp to be able to read all data from SYSTEM.CATALOG 
        try (PhoenixConnection queryConn = new PhoenixConnection(oldMetaConnection, HConstants.LATEST_TIMESTAMP);
        		PhoenixConnection upsertConn = new PhoenixConnection(oldMetaConnection, HConstants.LATEST_TIMESTAMP)) {
            LOGGER.info("Upgrading metadata to add parent links for indexes on views");
			String indexQuery = "SELECT TENANT_ID, TABLE_SCHEM, TABLE_NAME, COLUMN_FAMILY FROM SYSTEM.CATALOG WHERE LINK_TYPE = "
					+ LinkType.INDEX_TABLE.getSerializedValue();
			String createViewIndexLink = "UPSERT INTO SYSTEM.CATALOG (TENANT_ID, TABLE_SCHEM, TABLE_NAME, COLUMN_FAMILY, LINK_TYPE) VALUES (?,?,?,?,?) ";
            ResultSet rs = queryConn.createStatement().executeQuery(indexQuery);
            String prevTenantId = null;
            PhoenixConnection metaConn = queryConn;
            Properties props = new Properties(queryConn.getClientInfo());
			props.setProperty(PhoenixRuntime.CURRENT_SCN_ATTRIB, Long.toString(HConstants.LATEST_TIMESTAMP));
            while (rs.next()) {
            	String tenantId = rs.getString("TENANT_ID");
				if (!java.util.Objects.equals(prevTenantId, tenantId)) {
					prevTenantId = tenantId;
					props.setProperty(PhoenixRuntime.TENANT_ID_ATTRIB, tenantId);
            		metaConn = new PhoenixConnection(oldMetaConnection, props); 
            	}
            	String schemaName = rs.getString("TABLE_SCHEM");
            	String parentTableName = rs.getString("TABLE_NAME");
            	String fullParentTableName = SchemaUtil.getTableName(schemaName, parentTableName);
            	String indexName = rs.getString("COLUMN_FAMILY");
            	PTable table = PhoenixRuntime.getTable(metaConn, fullParentTableName);
            	if (table==null) {
            		throw new TableNotFoundException(fullParentTableName);
            	}
            	if (table.getType().equals(PTableType.VIEW)) {
            		PreparedStatement prepareStatement = upsertConn.prepareStatement(createViewIndexLink);
            		prepareStatement.setString(1, tenantId);
            		prepareStatement.setString(2, schemaName);
            		prepareStatement.setString(3, indexName);
            		prepareStatement.setString(4, parentTableName);
            		prepareStatement.setByte(5, LinkType.VIEW_INDEX_PARENT_TABLE.getSerializedValue());
            		prepareStatement.execute();
            		upsertConn.commit();
            	}
            }
            queryConn.getQueryServices().clearCache();
        }
    }

    /**
     * Synchronize column family properties using the default cf properties for a given table
     * @param tableDesc table descriptor of table to modify
     * @param defaultColFam default column family used as the baseline for property synchronization
     * @param syncedProps Map of properties to be kept in sync as read from the default column family descriptor
     * @return modified table descriptor builder
     */
    private static TableDescriptorBuilder syncColFamProperties(TableDescriptor tableDesc, ColumnFamilyDescriptor defaultColFam,
            Map<String, Object> syncedProps) {
        TableDescriptorBuilder tableDescBuilder = TableDescriptorBuilder.newBuilder(tableDesc);
        // Ensure that all column families have necessary properties in sync (including local index cf if present)
        for (ColumnFamilyDescriptor currentColFam: tableDesc.getColumnFamilies()) {
            if (!currentColFam.equals(defaultColFam)) {
                ColumnFamilyDescriptorBuilder colFamDescBuilder = ColumnFamilyDescriptorBuilder.newBuilder(currentColFam);
                for (String prop: MetaDataUtil.SYNCED_DATA_TABLE_AND_INDEX_COL_FAM_PROPERTIES) {
                    String existingPropVal = Bytes.toString(currentColFam.getValue(Bytes.toBytes(prop)));
                    String expectedPropVal = syncedProps.get(prop).toString();
                    if (existingPropVal == null || !existingPropVal.toLowerCase().equals(expectedPropVal.toLowerCase())) {
                        // Need to synchronize this property for the current column family descriptor
                        colFamDescBuilder.setValue(prop, expectedPropVal);
                    }
                }
                if (!colFamDescBuilder.equals(ColumnFamilyDescriptorBuilder.newBuilder(currentColFam))) {
                    tableDescBuilder.modifyColumnFamily(colFamDescBuilder.build());
                }
            }
        }
        return tableDescBuilder;
    }

    /**
     * Add the table descriptor to the set of table descriptors to keep in sync, if it has been changed
     * @param origTableDesc original table descriptor of the table in question
     * @param defaultColFam column family to be used for synchronizing properties
     * @param syncedProps Map of properties to be kept in sync as read from the default column family descriptor
     * @param tableDescsToSync set of modified table descriptors
     * @throws SQLException
     */
    private static void addTableDescIfPropsChanged(TableDescriptor origTableDesc, ColumnFamilyDescriptor defaultColFam,
            Map<String, Object> syncedProps, Set<TableDescriptor> tableDescsToSync) throws SQLException {
        TableDescriptorBuilder tableDescBuilder = syncColFamProperties(origTableDesc, defaultColFam, syncedProps);
        if (!origTableDesc.equals(tableDescBuilder.build())) {
            tableDescsToSync.add(tableDescBuilder.build());
        }
    }

    /**
     * Synchronize certain properties across column families of global index tables for a given base table
     * @param cqs CQS object to get table descriptor from PTable
     * @param baseTable base table
     * @param defaultColFam column family to be used for synchronizing properties
     * @param syncedProps Map of properties to be kept in sync as read from the default column family descriptor
     * @param tableDescsToSync set of modified table descriptors
     */
    private static void syncGlobalIndexesForTable(ConnectionQueryServices cqs, PTable baseTable, ColumnFamilyDescriptor defaultColFam,
            Map<String, Object> syncedProps, Set<TableDescriptor> tableDescsToSync) throws SQLException {
        for (PTable indexTable: baseTable.getIndexes()) {
            // We already handle local index property synchronization when considering all column families of the base table
            if (indexTable.getIndexType() == IndexType.GLOBAL) {
                addTableDescIfPropsChanged(cqs.getTableDescriptor(indexTable.getPhysicalName().getBytes()),
                        defaultColFam, syncedProps, tableDescsToSync);
            }
        }
    }

    /**
     * Synchronize certain properties across column families of view index tables for a given base table
     * @param cqs CQS object to get table descriptor from PTable
     * @param baseTable base table
     * @param defaultColFam column family to be used for synchronizing properties
     * @param syncedProps Map of properties to be kept in sync as read from the default column family descriptor
     * @param tableDescsToSync set of modified table descriptors
     */
    private static void syncViewIndexTable(ConnectionQueryServices cqs, PTable baseTable, ColumnFamilyDescriptor defaultColFam,
            Map<String, Object> syncedProps, Set<TableDescriptor> tableDescsToSync) throws SQLException {
        String viewIndexName = MetaDataUtil.getViewIndexPhysicalName(baseTable.getPhysicalName().getString());
        if (!Strings.isNullOrEmpty(viewIndexName)) {
            try {
                addTableDescIfPropsChanged(cqs.getTableDescriptor(Bytes.toBytes(viewIndexName)),
                        defaultColFam, syncedProps, tableDescsToSync);
            } catch (TableNotFoundException ignore) {
                // Ignore since this means that a view index table does not exist for this table
            }
        }
    }

    private static void syncUpdateCacheFreqForIndexesOfTable(PTable baseTable,
            PreparedStatement stmt) throws SQLException {
        for (PTable index : baseTable.getIndexes()) {
            if (index.getUpdateCacheFrequency() == baseTable.getUpdateCacheFrequency()) {
                continue;
            }
            stmt.setString(2, index.getSchemaName().getString());
            stmt.setString(3, index.getTableName().getString());
            stmt.setLong(4, baseTable.getUpdateCacheFrequency());
            stmt.addBatch();
        }
    }

    /**
     * See PHOENIX-4891. We set the UPDATE_CACHE_FREQUENCY of indexes to be same as their parent.
     * We do this for both physical base tables as well as views
     * @param conn Phoenix Connection object
     * @param table PTable corresponding to a physical base table
     * @throws SQLException
     * @throws IOException
     */
    public static void syncUpdateCacheFreqAllIndexes(PhoenixConnection conn, PTable table)
    throws SQLException, IOException {
        // Use own connection with max time stamp to be able to read all data from SYSTEM.CATALOG
        try(PhoenixConnection newConn = new PhoenixConnection(conn, HConstants.LATEST_TIMESTAMP)) {
            // Clear the server-side cache so that we get the latest built PTables
            newConn.unwrap(PhoenixConnection.class).getQueryServices().clearCache();
            byte[] tenantId = newConn.getTenantId() != null ?
                    newConn.getTenantId().getBytes() : null;

            PreparedStatement stmt =
                    newConn.prepareStatement(UPSERT_UPDATE_CACHE_FREQUENCY);
            stmt.setString(1, Bytes.toString(tenantId));
            syncUpdateCacheFreqForIndexesOfTable(table, stmt);

            TableViewFinderResult childViewsResult = new TableViewFinderResult();
            try (Table childLinkTable = newConn.getQueryServices()
                    .getTable(SchemaUtil.getPhysicalName(
                            PhoenixDatabaseMetaData.SYSTEM_CHILD_LINK_NAME_BYTES,
                            newConn.getQueryServices().getProps())
                            .getName())) {
                ViewUtil.findAllRelatives(childLinkTable, tenantId,
                        table.getSchemaName().getBytes(), table.getTableName().getBytes(),
                        LinkType.CHILD_TABLE, childViewsResult);

                // Iterate over the chain of child views
                for (TableInfo tableInfo: childViewsResult.getLinks()) {
                    PTable view;
                    String viewName = SchemaUtil.getTableName(tableInfo.getSchemaName(),
                            tableInfo.getTableName());
                    try {
                        view = PhoenixRuntime.getTable(newConn, viewName);
                    } catch (TableNotFoundException e) {
                        // Ignore
                        LOGGER.warn("Error getting PTable for view: " + viewName);
                        continue;
                    }
                    syncUpdateCacheFreqForIndexesOfTable(view, stmt);
                }
            }
            stmt.executeBatch();
            newConn.commit();
        }
    }

    /**
     * Make sure that all tables have necessary column family properties in sync
     * with each other and also in sync with all the table's indexes
     * See PHOENIX-3955
     * @param conn Phoenix connection
     * @param admin HBase admin used for getting existing tables and their descriptors
     * @throws SQLException
     * @throws IOException
     */
    public static void syncTableAndIndexProperties(PhoenixConnection conn, Admin admin)
    throws SQLException, IOException {
        Set<TableDescriptor> tableDescriptorsToSynchronize = new HashSet<>();
        for (TableDescriptor origTableDesc : admin.listTableDescriptors()) {
            if (MetaDataUtil.isViewIndex(origTableDesc.getTableName().getNameWithNamespaceInclAsString())) {
                // Ignore physical view index tables since we handle them for each base table already
                continue;
            }
            PTable table;
            String fullTableName = SchemaUtil.getPhysicalTableName(
                    origTableDesc.getTableName().getName(),
                    SchemaUtil.isNamespaceMappingEnabled(
                            null, conn.getQueryServices().getProps())).getNameAsString();
            try {
                // Use this getTable API to get the latest PTable
                table = PhoenixRuntime.getTable(conn, null, fullTableName);
            } catch (TableNotFoundException e) {
                // Ignore tables not mapped to a Phoenix Table
                LOGGER.warn("Error getting PTable for HBase table: " + fullTableName);
                continue;
            }
            if (table.getType() == PTableType.INDEX) {
                // Ignore global index tables since we handle them for each base table already
                continue;
            }
            syncUpdateCacheFreqAllIndexes(conn, table);
            ColumnFamilyDescriptor defaultColFam = origTableDesc.getColumnFamily(SchemaUtil.getEmptyColumnFamily(table));
            Map<String, Object> syncedProps = MetaDataUtil.getSyncedProps(defaultColFam);

            addTableDescIfPropsChanged(origTableDesc, defaultColFam, syncedProps, tableDescriptorsToSynchronize);
            syncGlobalIndexesForTable(conn.getQueryServices(), table, defaultColFam, syncedProps, tableDescriptorsToSynchronize);
            syncViewIndexTable(conn.getQueryServices(), table, defaultColFam, syncedProps, tableDescriptorsToSynchronize);
        }
        for (TableDescriptor t: tableDescriptorsToSynchronize) {
            admin.modifyTable(t);
        }
    }

    private static void upsertBaseColumnCountInHeaderRow(PhoenixConnection metaConnection,
            String tenantId, String schemaName, String viewOrTableName, int baseColumnCount)
            throws SQLException {
        try (PreparedStatement stmt =
                metaConnection.prepareStatement(UPSERT_BASE_COLUMN_COUNT_IN_HEADER_ROW)) {
            stmt.setString(1, tenantId);
            stmt.setString(2, schemaName);
            stmt.setString(3, viewOrTableName);
            stmt.setString(4, null);
            stmt.setString(5, null);
            stmt.setInt(6, baseColumnCount);
            stmt.executeUpdate();
        }
    }
    
    private static class ColumnDetails {

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + columnName.hashCode();
            result = prime * result + ((columnFamily == null) ? 0 : columnFamily.hashCode());
            result = prime * result + arraySize;
            result = prime * result + dataType;
            result = prime * result + maxLength;
            result = prime * result + ordinalValue;
            result = prime * result + scale;
            result = prime * result + sortOrder;
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) return true;
            if (obj == null) return false;
            if (getClass() != obj.getClass()) return false;
            ColumnDetails other = (ColumnDetails) obj;
            if (!columnName.equals(other.columnName)) return false;
            if (columnFamily == null) {
                if (other.columnFamily != null) return false;
            } else if (!columnFamily.equals(other.columnFamily)) return false;
            if (arraySize != other.arraySize) return false;
            if (dataType != other.dataType) return false;
            if (maxLength != other.maxLength) return false;
            if (ordinalValue != other.ordinalValue) return false;
            if (scale != other.scale) return false;
            if (sortOrder != other.sortOrder) return false;
            return true;
        }

        @Nullable
        private final String columnFamily;

        @Nonnull
        private final String columnName;

        private final int ordinalValue;

        private final int dataType;

        private final int maxLength;

        private final int scale;

        private final int sortOrder;

        private final int arraySize;

        ColumnDetails(String columnFamily, String columnName, int ordinalValue, int dataType,
                int maxLength, int scale, int sortOrder, int arraySize) {
            checkNotNull(columnName);
            checkNotNull(ordinalValue);
            checkNotNull(dataType);
            this.columnFamily = columnFamily;
            this.columnName = columnName;
            this.ordinalValue = ordinalValue;
            this.dataType = dataType;
            this.maxLength = maxLength;
            this.scale = scale;
            this.sortOrder = sortOrder;
            this.arraySize = arraySize;
        }

    }
    
    private static class ViewKey {

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((tenantId == null) ? 0 : tenantId.hashCode());
            result = prime * result + name.hashCode();
            result = prime * result + ((schema == null) ? 0 : schema.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) return true;
            if (obj == null) return false;
            if (getClass() != obj.getClass()) return false;
            ViewKey other = (ViewKey) obj;
            if (tenantId == null) {
                if (other.tenantId != null) return false;
            } else if (!tenantId.equals(other.tenantId)) return false;
            if (!name.equals(other.name)) return false;
            if (schema == null) {
                if (other.schema != null) return false;
            } else if (!schema.equals(other.schema)) return false;
            return true;
        }

        @Nullable
        private final String tenantId;

        @Nullable
        private final String schema;

        @Nonnull
        private final String name;

        private ViewKey(String tenantId, String schema, String viewName) {
            this.tenantId = tenantId;
            this.schema = schema;
            this.name = viewName;
        }
    }

    private static String getTableRVC(List<String> tableNames) {
        StringBuilder query = new StringBuilder("(");
        for (int i = 0; i < tableNames.size(); i+=3) {
            String tenantId = tableNames.get(i);
            String schemaName = tableNames.get(i+1);
            String tableName = tableNames.get(i+2);
            query.append('(');
            query.append(tenantId == null ? "null" : ("'" + tenantId + "'"));
            query.append(',');
            query.append(schemaName == null ? "null" : ("'" + schemaName + "'"));
            query.append(',');
            query.append("'" + tableName + "'");
            query.append("),");
        }
        // Replace trailing , with ) to end IN expression
        query.setCharAt(query.length()-1, ')');
        return query.toString();
    }
    
    private static List<String> addPhysicalTables(PhoenixConnection conn, ResultSet rs, PTableType otherType, Set<String> physicalTables) throws SQLException {
        List<String> tableNames = Lists.newArrayListWithExpectedSize(1024);
        while (rs.next()) {
            tableNames.add(rs.getString(1));
            tableNames.add(rs.getString(2));
            tableNames.add(rs.getString(3));
        }
        if (tableNames.isEmpty()) {
            return Collections.emptyList();
        }
        
        List<String> otherTables = Lists.newArrayListWithExpectedSize(tableNames.size());
        // Find the header rows for tables that have not been upgraded already.
        // We don't care about views, as the row key cannot be different than the table.
        // We need this query to find physical tables which won't have a link row.
        String query = "SELECT TENANT_ID,TABLE_SCHEM,TABLE_NAME,TABLE_TYPE\n" + 
                "FROM SYSTEM.CATALOG (ROW_KEY_ORDER_OPTIMIZABLE BOOLEAN)\n" + 
                "WHERE COLUMN_NAME IS NULL\n" + 
                "AND COLUMN_FAMILY IS NULL\n" + 
                "AND ROW_KEY_ORDER_OPTIMIZABLE IS NULL\n" +
                "AND TABLE_TYPE IN ('" + PTableType.TABLE.getSerializedValue() + "','" + otherType.getSerializedValue() + "')\n" +
                "AND (TENANT_ID, TABLE_SCHEM, TABLE_NAME) IN " + getTableRVC(tableNames);
        rs = conn.createStatement().executeQuery(query);
        
        while (rs.next()) {
            if (PTableType.TABLE.getSerializedValue().equals(rs.getString(4))) {
                physicalTables.add(SchemaUtil.getTableName(rs.getString(2), rs.getString(3)));
            } else {
                otherTables.add(rs.getString(1));
                otherTables.add(rs.getString(2));
                otherTables.add(rs.getString(3));
            }
        }
        return otherTables;
    }
    
    // Return all types that are descending and either:
    // 1) variable length, which includes all array types (PHOENIX-2067)
    // 2) fixed length with padding (PHOENIX-2120)
    // 3) float and double (PHOENIX-2171)
    // We exclude VARBINARY as we no longer support DESC for it.
    private static String getAffectedDataTypes() {
        StringBuilder buf = new StringBuilder("(" 
                + PVarchar.INSTANCE.getSqlType() + "," +
                + PChar.INSTANCE.getSqlType() + "," +
                + PBinary.INSTANCE.getSqlType() + "," +
                + PFloat.INSTANCE.getSqlType() + "," +
                + PDouble.INSTANCE.getSqlType() + "," +
                + PDecimal.INSTANCE.getSqlType() + ","
                );
        for (PDataType type : PDataType.values()) {
            if (type.isArrayType()) {
                buf.append(type.getSqlType());
                buf.append(',');
            }
        }
        buf.setCharAt(buf.length()-1, ')');
        return buf.toString();
    }
    
    
    /**
     * Identify the tables that are DESC VARBINARY as this is no longer supported
     */
    public static List<String> getPhysicalTablesWithDescVarbinaryRowKey(PhoenixConnection conn) throws SQLException {
        String query = "SELECT TENANT_ID,TABLE_SCHEM,TABLE_NAME\n" + 
                "FROM SYSTEM.CATALOG cat1\n" + 
                "WHERE COLUMN_NAME IS NOT NULL\n" + 
                "AND COLUMN_FAMILY IS NULL\n" + 
                "AND SORT_ORDER = " + SortOrder.DESC.getSystemValue() + "\n" + 
                "AND DATA_TYPE = " + PVarbinary.INSTANCE.getSqlType() + "\n" +
                "GROUP BY TENANT_ID,TABLE_SCHEM,TABLE_NAME";
        return getPhysicalTablesWithDescRowKey(query, conn);
    }
    
    /**
     * Identify the tables that need to be upgraded due to PHOENIX-2067 and PHOENIX-2120
     */
    public static List<String> getPhysicalTablesWithDescRowKey(PhoenixConnection conn) throws SQLException {
        String query = "SELECT TENANT_ID,TABLE_SCHEM,TABLE_NAME\n" + 
                "FROM SYSTEM.CATALOG cat1\n" + 
                "WHERE COLUMN_NAME IS NOT NULL\n" + 
                "AND COLUMN_FAMILY IS NULL\n" + 
                "AND ( ( SORT_ORDER = " + SortOrder.DESC.getSystemValue() + "\n" + 
                "        AND DATA_TYPE IN " + getAffectedDataTypes() + ")\n" +
                "    OR ( SORT_ORDER = " + SortOrder.ASC.getSystemValue() + "\n" + 
                "         AND DATA_TYPE = " + PBinary.INSTANCE.getSqlType() + "\n" +
                "         AND COLUMN_SIZE > 1 ) )\n" +
                "GROUP BY TENANT_ID,TABLE_SCHEM,TABLE_NAME";
        return getPhysicalTablesWithDescRowKey(query, conn);
    }
    
    /**
     * Identify the tables that need to be upgraded due to PHOENIX-2067
     */
    private static List<String> getPhysicalTablesWithDescRowKey(String query, PhoenixConnection conn) throws SQLException {
        // First query finds column rows of tables that need to be upgraded.
        // We cannot tell if the column is from a table, view, or index however.
        ResultSet rs = conn.createStatement().executeQuery(query);
        Set<String> physicalTables = Sets.newHashSetWithExpectedSize(1024);
        List<String> remainingTableNames = addPhysicalTables(conn, rs, PTableType.INDEX, physicalTables);
        if (!remainingTableNames.isEmpty()) {
            // Find tables/views for index
            String indexLinkQuery = "SELECT TENANT_ID,TABLE_SCHEM,TABLE_NAME\n" + 
                    "FROM SYSTEM.CATALOG\n" + 
                    "WHERE COLUMN_NAME IS NULL\n" + 
                    "AND (TENANT_ID, TABLE_SCHEM, COLUMN_FAMILY) IN " + getTableRVC(remainingTableNames) + "\n" +
                    "AND LINK_TYPE = " + LinkType.INDEX_TABLE.getSerializedValue();
             rs = conn.createStatement().executeQuery(indexLinkQuery);
             remainingTableNames = addPhysicalTables(conn, rs, PTableType.VIEW, physicalTables);
             if (!remainingTableNames.isEmpty()) {
                 // Find physical table name from views, splitting on '.' to get schema name and table name
                 String physicalLinkQuery = "SELECT null, " + 
                 " CASE WHEN INSTR(COLUMN_FAMILY,'.') = 0 THEN NULL ELSE SUBSTR(COLUMN_FAMILY,1,INSTR(COLUMN_FAMILY,'.')) END,\n" + 
                 " CASE WHEN INSTR(COLUMN_FAMILY,'.') = 0 THEN COLUMN_FAMILY ELSE SUBSTR(COLUMN_FAMILY,INSTR(COLUMN_FAMILY,'.')+1) END\n" + 
                         "FROM SYSTEM.CATALOG\n" + 
                         "WHERE COLUMN_NAME IS NULL\n" + 
                         "AND COLUMN_FAMILY IS NOT NULL\n" + 
                         "AND (TENANT_ID, TABLE_SCHEM, TABLE_NAME) IN " + getTableRVC(remainingTableNames) + "\n" +
                         "AND LINK_TYPE = " + LinkType.PHYSICAL_TABLE.getSerializedValue();
                 rs = conn.createStatement().executeQuery(physicalLinkQuery);
                 // Add any tables (which will all be physical tables) which have not already been upgraded.
                 addPhysicalTables(conn, rs, PTableType.TABLE, physicalTables);
             }
        }
        List<String> sortedPhysicalTables = new ArrayList<String>(physicalTables);
        Collections.sort(sortedPhysicalTables);
        return sortedPhysicalTables;
    }

    private static void upgradeDescVarLengthRowKeys(PhoenixConnection upgradeConn, PhoenixConnection globalConn, String schemaName, String tableName, boolean isTable, boolean bypassUpgrade) throws SQLException {
        TableName physicalName = TableName.valueOf(SchemaUtil.getTableName(schemaName, tableName));
        long currentTime = System.currentTimeMillis();
        String snapshotName = physicalName + "_" + currentTime;
        Admin admin = null;
        if (isTable && !bypassUpgrade) {
            admin = globalConn.getQueryServices().getAdmin();
        }
        boolean restoreSnapshot = false;
        boolean success = false;
        try {
            if (isTable && !bypassUpgrade) {
                String msg = "Taking snapshot of physical table " + physicalName + " prior to upgrade...";
                System.out.println(msg);
                LOGGER.info(msg);
                admin.disableTable(physicalName);
                admin.snapshot(snapshotName, physicalName);
                admin.enableTable(physicalName);
                restoreSnapshot = true;
            }
            String escapedTableName = SchemaUtil.getEscapedTableName(schemaName, tableName);
            String tenantInfo = "";
            PName tenantId = PName.EMPTY_NAME;
            if (upgradeConn.getTenantId() != null) {
                tenantId = upgradeConn.getTenantId();
                tenantInfo = " for tenant " + tenantId.getString();
            }
            String msg = "Starting upgrade of " + escapedTableName + tenantInfo + "...";
            System.out.println(msg);
            LOGGER.info(msg);
            ResultSet rs;
            if (!bypassUpgrade) {
                rs = upgradeConn.createStatement().executeQuery("SELECT /*+ NO_INDEX */ count(*) FROM " + escapedTableName);
                rs.next(); // Run query
            }
            List<String> tableNames = Lists.newArrayListWithExpectedSize(1024);
            tableNames.add(tenantId == PName.EMPTY_NAME ? null : tenantId.getString());
            tableNames.add(schemaName);
            tableNames.add(tableName);
            // Find views to mark as upgraded
            if (isTable) {
                String query =
                        "SELECT TENANT_ID,TABLE_SCHEM,TABLE_NAME\n" + 
                        "FROM SYSTEM.CATALOG\n" + 
                        "WHERE COLUMN_NAME IS NULL\n" + 
                        "AND COLUMN_FAMILY = '" + physicalName + "'" +
                        "AND LINK_TYPE = " + LinkType.PHYSICAL_TABLE.getSerializedValue();
                rs = globalConn.createStatement().executeQuery(query);
                while (rs.next()) {
                    tableNames.add(rs.getString(1));
                    tableNames.add(rs.getString(2));
                    tableNames.add(rs.getString(3));
                }
            }
            // Mark the table and views as upgraded now
            for (int i = 0; i < tableNames.size(); i += 3) {
                String theTenantId = tableNames.get(i);
                String theSchemaName = tableNames.get(i+1);
                String theTableName = tableNames.get(i+2);
                globalConn.createStatement().execute("UPSERT INTO " + PhoenixDatabaseMetaData.SYSTEM_CATALOG_NAME + 
                    " (" + PhoenixDatabaseMetaData.TENANT_ID + "," +
                           PhoenixDatabaseMetaData.TABLE_SCHEM + "," +
                           PhoenixDatabaseMetaData.TABLE_NAME + "," +
                           MetaDataEndpointImpl.ROW_KEY_ORDER_OPTIMIZABLE + " BOOLEAN"
                   + ") VALUES (" +
                           "'" + (theTenantId == null ? StringUtil.EMPTY_STRING : theTenantId) + "'," +
                           "'" + (theSchemaName == null ? StringUtil.EMPTY_STRING : theSchemaName) + "'," +
                           "'" + theTableName + "'," +
                           "TRUE)");
            }
            globalConn.commit();
            for (int i = 0; i < tableNames.size(); i += 3) {
                String theTenantId = tableNames.get(i);
                String theSchemaName = tableNames.get(i+1);
                String theTableName = tableNames.get(i+2);
                globalConn.getQueryServices().clearTableFromCache(
                        theTenantId == null ? ByteUtil.EMPTY_BYTE_ARRAY : Bytes.toBytes(theTenantId),
                        theSchemaName == null ? ByteUtil.EMPTY_BYTE_ARRAY : Bytes.toBytes(schemaName),
                        Bytes.toBytes(theTableName), HConstants.LATEST_TIMESTAMP);
            }
            success = true;
            msg = "Completed upgrade of " + escapedTableName + tenantInfo;
            System.out.println(msg);
            LOGGER.info(msg);
        } catch (Exception e) {
            LOGGER.error("Exception during upgrade of " + physicalName + ":", e);
        } finally {
            boolean restored = false;
            try {
                if (!success && restoreSnapshot) {
                    admin.disableTable(physicalName);
                    admin.restoreSnapshot(snapshotName, false);
                    admin.enableTable(physicalName);
                    String msg = "Restored snapshot of " + physicalName + " due to failure of upgrade";
                    System.out.println(msg);
                    LOGGER.info(msg);
                }
                restored = true;
            } catch (Exception e) {
                LOGGER.warn("Unable to restoring snapshot " + snapshotName + " after failed upgrade", e);
            } finally {
                try {
                    if (restoreSnapshot && restored) {
                        admin.deleteSnapshot(snapshotName);
                    }
                } catch (Exception e) {
                    LOGGER.warn("Unable to delete snapshot " + snapshotName + " after upgrade:", e);
                } finally {
                    try {
                        if (admin != null) {
                            admin.close();
                        }
                    } catch (IOException e) {
                        LOGGER.warn("Unable to close admin after upgrade:", e);
                    }
                }
            }
        }
    }
    
    private static boolean isInvalidTableToUpgrade(PTable table) throws SQLException {
        return (table.getType() != PTableType.TABLE || // Must be a table
            table.getTenantId() != null || // Must be global
            !table.getPhysicalName().equals(table.getName())); // Must be the physical table
    }
    /**
     * Upgrade tables and their indexes due to a bug causing descending row keys to have a row key that
     * prevents them from being sorted correctly (PHOENIX-2067).
     */
    public static void upgradeDescVarLengthRowKeys(PhoenixConnection conn, List<String> tablesToUpgrade, boolean bypassUpgrade) throws SQLException {
        if (tablesToUpgrade.isEmpty()) {
            return;
        }
        List<PTable> tablesNeedingUpgrading = Lists.newArrayListWithExpectedSize(tablesToUpgrade.size());
        List<String> invalidTables = Lists.newArrayListWithExpectedSize(tablesToUpgrade.size());
        for (String fullTableName : tablesToUpgrade) {
            PTable table = PhoenixRuntime.getTable(conn, fullTableName);
            if (isInvalidTableToUpgrade(table)) {
                invalidTables.add(fullTableName);
            } else {
                tablesNeedingUpgrading.add(table);
            }
        }
        if (!invalidTables.isEmpty()) {
            StringBuilder buf = new StringBuilder("Only physical tables should be upgraded as their views and indexes will be updated with them: ");
            for (String fullTableName : invalidTables) {
                buf.append(fullTableName);
                buf.append(' ');
            }
            throw new SQLException(buf.toString());
        }
        PhoenixConnection upgradeConn = new PhoenixConnection(conn, true, true);
        try {
            upgradeConn.setAutoCommit(true);
            for (PTable table : tablesNeedingUpgrading) {
                boolean wasUpgraded = false;
                if (!table.rowKeyOrderOptimizable()) {
                    wasUpgraded = true;
                    upgradeDescVarLengthRowKeys(upgradeConn, conn, table.getSchemaName().getString(), table.getTableName().getString(), true, bypassUpgrade);
                }
                
                // Upgrade global indexes
                for (PTable index : table.getIndexes()) {
                    if (!index.rowKeyOrderOptimizable() && index.getIndexType() != IndexType.LOCAL) {
                        wasUpgraded = true;
                        upgradeDescVarLengthRowKeys(upgradeConn, conn, index.getSchemaName().getString(), index.getTableName().getString(), false, bypassUpgrade);
                    }
                }
                
                String sharedViewIndexName = Bytes.toString(MetaDataUtil.getViewIndexPhysicalName(table.getName().getBytes()));
                // Upgrade view indexes
                wasUpgraded |= upgradeSharedIndex(upgradeConn, conn, sharedViewIndexName, bypassUpgrade);
                String sharedLocalIndexName = Bytes.toString(MetaDataUtil.getLocalIndexPhysicalName(table.getName().getBytes()));
                // Upgrade local indexes
                wasUpgraded |= upgradeSharedIndex(upgradeConn, conn, sharedLocalIndexName, bypassUpgrade);
                
                if (!wasUpgraded) {
                    System.out.println("Upgrade not required for this table or its indexes: " + table.getName().getString());
                }
            }
        } finally {
            upgradeConn.close();
        }
    }
    
    /**
     * Upgrade shared indexes by querying for all that are associated with our
     * physical table.
     * @return true if any upgrades were performed and false otherwise.
     */
    private static boolean upgradeSharedIndex(PhoenixConnection upgradeConn, PhoenixConnection globalConn, String physicalName, boolean bypassUpgrade) throws SQLException {
        String query =
                "SELECT TENANT_ID,TABLE_SCHEM,TABLE_NAME\n" + 
                "FROM SYSTEM.CATALOG cat1\n" + 
                "WHERE COLUMN_NAME IS NULL\n" + 
                "AND COLUMN_FAMILY = '" + physicalName + "'\n" + 
                "AND LINK_TYPE = " + LinkType.PHYSICAL_TABLE.getSerializedValue() + "\n" +
                "ORDER BY TENANT_ID";
        ResultSet rs = globalConn.createStatement().executeQuery(query);
        String lastTenantId = null;
        Connection conn = globalConn;
        String url = globalConn.getURL();
        boolean wasUpgraded = false;
        while (rs.next()) {
            String fullTableName = SchemaUtil.getTableName(
                    rs.getString(PhoenixDatabaseMetaData.TABLE_SCHEM),
                    rs.getString(PhoenixDatabaseMetaData.TABLE_NAME));
            String tenantId = rs.getString(1);
            if (tenantId != null && !tenantId.equals(lastTenantId))  {
                if (lastTenantId != null) {
                    conn.close();
                }
                // Open tenant-specific connection when we find a new one
                Properties props = new Properties(globalConn.getClientInfo());
                props.setProperty(PhoenixRuntime.TENANT_ID_ATTRIB, tenantId);
                conn = DriverManager.getConnection(url, props);
                lastTenantId = tenantId;
            }
            PTable table = PhoenixRuntime.getTable(conn, fullTableName);
            String tableTenantId = table.getTenantId() == null ? null : table.getTenantId().getString();
            if (Objects.equal(lastTenantId, tableTenantId) && !table.rowKeyOrderOptimizable()) {
                upgradeDescVarLengthRowKeys(upgradeConn, globalConn, table.getSchemaName().getString(), table.getTableName().getString(), false, bypassUpgrade);
                wasUpgraded = true;
            }
        }
        rs.close();
        if (lastTenantId != null) {
            conn.close();
        }
        return wasUpgraded;
    }

    public static void addRowKeyOrderOptimizableCell(List<Mutation> tableMetadata, byte[] tableHeaderRowKey, long clientTimeStamp) {
        Put put = new Put(tableHeaderRowKey, clientTimeStamp);
        put.addColumn(PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES,
                MetaDataEndpointImpl.ROW_KEY_ORDER_OPTIMIZABLE_BYTES, PBoolean.INSTANCE.toBytes(true));
        tableMetadata.add(put);
    }

    public static boolean truncateStats(Table metaTable, Table statsTable)
            throws IOException, InterruptedException {
        byte[] statsTableKey = SchemaUtil.getTableKey(null, PhoenixDatabaseMetaData.SYSTEM_SCHEMA_NAME,
                PhoenixDatabaseMetaData.SYSTEM_STATS_TABLE);
        List<Cell> columnCells = metaTable.get(new Get(statsTableKey))
                .getColumnCells(PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES, QueryConstants.EMPTY_COLUMN_BYTES);
        long timestamp;
        if (!columnCells.isEmpty() && (timestamp = columnCells.get(0)
                .getTimestamp()) < MetaDataProtocol.MIN_SYSTEM_TABLE_TIMESTAMP_4_7_0) {

            Cell upgradeKV = PhoenixKeyValueUtil.newKeyValue(statsTableKey, PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES,
                    UPGRADE_TO_4_7_COLUMN_NAME, timestamp, PBoolean.INSTANCE.toBytes(true));
            Put upgradePut = new Put(statsTableKey);
            upgradePut.add(upgradeKV);

            // check for null in UPGRADE_TO_4_7_COLUMN_NAME in checkAndPut so that only single client
            // drop the rows of SYSTEM.STATS
            if (metaTable.checkAndPut(statsTableKey, PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES,
                    UPGRADE_TO_4_7_COLUMN_NAME, null, upgradePut)) {
                List<Mutation> mutations = Lists.newArrayListWithExpectedSize(1000);
                Scan scan = new Scan();
                scan.setRaw(true);
                scan.setMaxVersions();
                ResultScanner statsScanner = statsTable.getScanner(scan);
                Result r;
                mutations.clear();
                int count = 0;
                while ((r = statsScanner.next()) != null) {
                    Delete delete = null;
                    for (Cell keyValue : r.rawCells()) {
                        if (KeyValue.Type.codeToType(keyValue.getTypeByte()) == KeyValue.Type.Put) {
                            if (delete == null) {
                                delete = new Delete(keyValue.getRowArray(), keyValue.getRowOffset(), keyValue.getRowLength());
                            }
                            KeyValue deleteKeyValue = new KeyValue(keyValue.getRowArray(), keyValue.getRowOffset(),
                                    keyValue.getRowLength(), keyValue.getFamilyArray(), keyValue.getFamilyOffset(),
                                    keyValue.getFamilyLength(), keyValue.getQualifierArray(),
                                    keyValue.getQualifierOffset(), keyValue.getQualifierLength(),
                                    keyValue.getTimestamp(), KeyValue.Type.Delete, ByteUtil.EMPTY_BYTE_ARRAY, 0, 0);
                            delete.addDeleteMarker(deleteKeyValue);
                        }
                    }
                    if (delete != null) {
                        mutations.add(delete);
                        if (count > 10) {
                            statsTable.batch(mutations, null);
                            mutations.clear();
                            count = 0;
                        }
                        count++;
                    }
                }
                if (!mutations.isEmpty()) {
                    statsTable.batch(mutations, null);
                }
                return true;
            }
        }
        return false;
    }

    private static void mapTableToNamespace(Admin admin, Table metatable, String srcTableName,
            String destTableName, ReadOnlyProps props, Long ts, String phoenixTableName, PTableType pTableType,PName tenantId)
                    throws SnapshotCreationException, IllegalArgumentException, IOException, InterruptedException,
                    SQLException {
        if (!SchemaUtil.isNamespaceMappingEnabled(pTableType,
                props)) { throw new IllegalArgumentException(SchemaUtil.isSystemTable(srcTableName.getBytes())
                        ? "For system table " + QueryServices.IS_SYSTEM_TABLE_MAPPED_TO_NAMESPACE
                                + " also needs to be enabled along with " + QueryServices.IS_NAMESPACE_MAPPING_ENABLED
                        : QueryServices.IS_NAMESPACE_MAPPING_ENABLED + " is not enabled"); }
        mapTableToNamespace(admin, srcTableName, destTableName, pTableType);

        byte[] tableKey = SchemaUtil.getTableKey(tenantId != null ? tenantId.getString() : null,
                SchemaUtil.getSchemaNameFromFullName(phoenixTableName),
                SchemaUtil.getTableNameFromFullName(phoenixTableName));
        List<Cell> columnCells = metatable.get(new Get(tableKey))
                .getColumnCells(PhoenixDatabaseMetaData.TABLE_FAMILY_BYTES, QueryConstants.EMPTY_COLUMN_BYTES);
        if (ts == null) {
            if (!columnCells.isEmpty()) {
                ts = columnCells.get(0).getTimestamp();
            } else if (PTableType.SYSTEM != pTableType) { throw new IllegalArgumentException(
                    "Timestamp passed is null and cannot derive timestamp for " + tableKey + " from meta table!!"); }
        }
        if (ts != null) {
            // Update flag to represent table is mapped to namespace
            LOGGER.info(String.format("Updating meta information of phoenix table '%s' to map to namespace..",
                    phoenixTableName));
            Put put = new Put(tableKey, ts);
            put.addColumn(QueryConstants.DEFAULT_COLUMN_FAMILY_BYTES, PhoenixDatabaseMetaData.IS_NAMESPACE_MAPPED_BYTES,
                    PBoolean.INSTANCE.toBytes(Boolean.TRUE));
            metatable.put(put);
        }
    }

    public static void mapTableToNamespace(Admin admin, String srcTableName, String destTableName, PTableType pTableType) throws IOException {
        TableName srcTable = TableName.valueOf(SchemaUtil.normalizeIdentifier(srcTableName));
        TableName dstTable = TableName.valueOf(destTableName);
        boolean srcTableExists=admin.tableExists(srcTable);
        // we need to move physical table in actual namespace for TABLE and Index
        if (srcTableExists && (PTableType.TABLE.equals(pTableType)
                || PTableType.INDEX.equals(pTableType) || PTableType.SYSTEM.equals(pTableType))) {
            boolean destTableExists=admin.tableExists(dstTable);
            if (!destTableExists) {
                String snapshotName = QueryConstants.UPGRADE_TABLE_SNAPSHOT_PREFIX + srcTableName;
                LOGGER.info("Disabling table " + srcTableName + " ..");
                admin.disableTable(srcTable);
                LOGGER.info(String.format("Taking snapshot %s of table %s..", snapshotName, srcTableName));
                admin.snapshot(snapshotName, srcTable);
                LOGGER.info(
                        String.format("Restoring snapshot %s in destination table %s..", snapshotName, destTableName));
                admin.cloneSnapshot(snapshotName, dstTable);
                LOGGER.info(String.format("deleting old table %s..", srcTableName));
                admin.deleteTable(srcTable);
                LOGGER.info(String.format("deleting snapshot %s..", snapshotName));
                admin.deleteSnapshot(snapshotName);
            } else {
                LOGGER.info(String.format("Destination Table %s already exists. No migration needed.", destTableName));
            }
        }
    }

    /*
     * Method to map existing phoenix table to a namespace. Should not be use if tables has views and indexes ,instead
     * use map table utility in psql.py
     */
    public static void mapTableToNamespace(Admin admin, Table metatable, String tableName,
            ReadOnlyProps props, Long ts, PTableType pTableType, PName tenantId) throws SnapshotCreationException,
                    IllegalArgumentException, IOException, InterruptedException, SQLException {
        String destTablename = SchemaUtil
                .normalizeIdentifier(SchemaUtil.getPhysicalTableName(tableName, props).getNameAsString());
        mapTableToNamespace(admin, metatable, tableName, destTablename, props, ts, tableName, pTableType, tenantId);
    }

    public static void upgradeTable(PhoenixConnection conn, String srcTable) throws SQLException,
            SnapshotCreationException, IllegalArgumentException, IOException, InterruptedException {
        ReadOnlyProps readOnlyProps = conn.getQueryServices().getProps();
        if (conn.getSchema() != null) { throw new IllegalArgumentException(
                "Schema should not be set for connection!!"); }
        if (!SchemaUtil.isNamespaceMappingEnabled(PTableType.TABLE,
                readOnlyProps)) { throw new IllegalArgumentException(
                        QueryServices.IS_NAMESPACE_MAPPING_ENABLED + " is not enabled!!"); }
        try (Admin admin = conn.getQueryServices().getAdmin();
                Table metatable = conn.getQueryServices()
                        .getTable(SchemaUtil
                                .getPhysicalName(PhoenixDatabaseMetaData.SYSTEM_CATALOG_NAME_BYTES, readOnlyProps)
                                .getName());) {
            String fullTableName = SchemaUtil.normalizeIdentifier(srcTable);
            String schemaName = SchemaUtil.getSchemaNameFromFullName(fullTableName);
            String tableName = SchemaUtil.getTableNameFromFullName(fullTableName);
            // Confirm table is not already upgraded
            PTable table = PhoenixRuntime.getTable(conn, fullTableName);
            
            // Upgrade is not required if schemaName is not present.
            if (schemaName.equals("") && !PTableType.VIEW
                    .equals(table.getType())) { throw new IllegalArgumentException("Table doesn't have schema name"); }

            if (table.isNamespaceMapped()) { throw new IllegalArgumentException("Table is already upgraded"); }
            if (!schemaName.equals("")) {
                LOGGER.info(String.format("Creating schema %s..", schemaName));
                conn.createStatement().execute("CREATE SCHEMA IF NOT EXISTS " + schemaName);
            }
            String oldPhysicalName = table.getPhysicalName().getString();
            String newPhysicalTablename = SchemaUtil.normalizeIdentifier(
                    SchemaUtil.getPhysicalTableName(oldPhysicalName, readOnlyProps).getNameAsString());
            LOGGER.info(String.format("Upgrading %s %s..", table.getType(), fullTableName));
            LOGGER.info(String.format("oldPhysicalName %s newPhysicalTablename %s..", oldPhysicalName, newPhysicalTablename));
            LOGGER.info(String.format("teanantId %s..", conn.getTenantId()));

            TableViewFinderResult childViewsResult = new TableViewFinderResult();
            try (Table childLinkTable =
                    conn.getQueryServices()
                            .getTable(SchemaUtil.getPhysicalName(
                                PhoenixDatabaseMetaData.SYSTEM_CHILD_LINK_NAME_BYTES, readOnlyProps)
                                    .getName())) {
                byte[] tenantId = conn.getTenantId() != null ? conn.getTenantId().getBytes() : null;
                ViewUtil.findAllRelatives(childLinkTable, tenantId, schemaName.getBytes(),
                    tableName.getBytes(), LinkType.CHILD_TABLE, childViewsResult);
            }

            // Upgrade the data or main table
            mapTableToNamespace(admin, metatable, fullTableName, newPhysicalTablename, readOnlyProps,
                    PhoenixRuntime.getCurrentScn(readOnlyProps), fullTableName, table.getType(),conn.getTenantId());
            // clear the cache and get new table
            conn.removeTable(conn.getTenantId(), fullTableName,
                table.getParentName() != null ? table.getParentName().getString() : null,
                table.getTimeStamp());
            byte[] tenantIdBytes = conn.getTenantId() == null ? ByteUtil.EMPTY_BYTE_ARRAY : conn.getTenantId().getBytes();
            conn.getQueryServices().clearTableFromCache(
                    tenantIdBytes,
                    table.getSchemaName().getBytes(), table.getTableName().getBytes(),
                    PhoenixRuntime.getCurrentScn(readOnlyProps));
            MetaDataMutationResult result =
                    new MetaDataClient(conn).updateCache(conn.getTenantId(), schemaName, tableName,
                        true);
            if (result.getMutationCode() != MutationCode.TABLE_ALREADY_EXISTS) { throw new TableNotFoundException(
              schemaName, fullTableName); }
            table = result.getTable();
            
            // check whether table is properly upgraded before upgrading indexes
            if (table.isNamespaceMapped()) {
                for (PTable index : table.getIndexes()) {
                    String srcTableName = index.getPhysicalName().getString();
                    String destTableName = null;
                    String phoenixTableName = index.getName().getString();
                    boolean updateLink = true;
                    if (srcTableName.contains(QueryConstants.NAMESPACE_SEPARATOR)) {
                        // Skip already migrated
                        LOGGER.info(String.format("skipping as it seems index '%s' is already upgraded..",
                                index.getName()));
                        continue;
                    }
                    if (MetaDataUtil.isLocalIndex(srcTableName)) {
                        LOGGER.info(String.format("local index '%s' found with physical hbase table name ''..",
                                index.getName(), srcTableName));
                        destTableName = Bytes
                                .toString(MetaDataUtil.getLocalIndexPhysicalName(newPhysicalTablename.getBytes()));
                        // update parent_table property in local index table descriptor
                        conn.createStatement()
                                .execute(String.format("ALTER TABLE %s set " + MetaDataUtil.PARENT_TABLE_KEY + "='%s'",
                                        phoenixTableName, table.getPhysicalName()));
                    } else if (MetaDataUtil.isViewIndex(srcTableName)) {
                        LOGGER.info(String.format("View index '%s' found with physical hbase table name ''..",
                                index.getName(), srcTableName));
                        destTableName = Bytes
                                .toString(MetaDataUtil.getViewIndexPhysicalName(newPhysicalTablename.getBytes()));
                    } else {
                        LOGGER.info(String.format("Global index '%s' found with physical hbase table name ''..",
                                index.getName(), srcTableName));
                        destTableName = SchemaUtil
                                .getPhysicalTableName(index.getPhysicalName().getString(), readOnlyProps)
                                .getNameAsString();
                    }
                    LOGGER.info(String.format("Upgrading index %s..", index.getName()));
                    if (!(table.getType() == PTableType.VIEW && !MetaDataUtil.isViewIndex(srcTableName)
                            && IndexType.LOCAL != index.getIndexType())) {
                        mapTableToNamespace(admin, metatable, srcTableName, destTableName, readOnlyProps,
                                PhoenixRuntime.getCurrentScn(readOnlyProps), phoenixTableName, index.getType(),
                                conn.getTenantId());
                    }
                    if (updateLink) {
                        LOGGER.info(String.format("Updating link information for index '%s' ..", index.getName()));
                        updateLink(conn, srcTableName, destTableName,index.getSchemaName(),index.getTableName());
                        conn.commit();
                    }
                    conn.getQueryServices().clearTableFromCache(
                            tenantIdBytes,
                            index.getSchemaName().getBytes(), index.getTableName().getBytes(),
                            PhoenixRuntime.getCurrentScn(readOnlyProps));
                }
                updateIndexesSequenceIfPresent(conn, table);
                conn.commit();
            } else {
                throw new RuntimeException("Error: problem occured during upgrade. Table is not upgraded successfully");
            }
            if (table.getType() == PTableType.VIEW) {
                LOGGER.info(String.format("Updating link information for view '%s' ..", table.getTableName()));
                updateLink(conn, oldPhysicalName, newPhysicalTablename,table.getSchemaName(),table.getTableName());
                conn.commit();
                
                // if the view is a first level child, then we need to create the PARENT_TABLE link
                // that was overwritten by the PHYSICAL_TABLE link 
                if (table.getParentName().equals(table.getPhysicalName())) {
                    LOGGER.info(String.format("Creating PARENT link for view '%s' ..", table.getTableName()));
                    // Add row linking view to its parent 
                    PreparedStatement linkStatement = conn.prepareStatement(MetaDataClient.CREATE_VIEW_LINK);
                    linkStatement.setString(1, Bytes.toStringBinary(tenantIdBytes));
                    linkStatement.setString(2, table.getSchemaName().getString());
                    linkStatement.setString(3, table.getTableName().getString());
                    linkStatement.setString(4, table.getParentName().getString());
                    linkStatement.setByte(5, LinkType.PARENT_TABLE.getSerializedValue());
                    linkStatement.setString(6, null);
                    linkStatement.execute();
                    conn.commit();
                }
                
                conn.getQueryServices().clearTableFromCache(
                    tenantIdBytes,
                    table.getSchemaName().getBytes(), table.getTableName().getBytes(),
                    PhoenixRuntime.getCurrentScn(readOnlyProps));
            }
            // Upgrade all child views
            if (table.getType() == PTableType.TABLE) {
                mapChildViewsToNamespace(conn.getURL(), conn.getClientInfo(), childViewsResult.getLinks());
            }
        }
    }

    private static void updateIndexesSequenceIfPresent(PhoenixConnection connection, PTable dataTable)
            throws SQLException {
        PName tenantId = connection.getTenantId();
        PName physicalName = dataTable.getPhysicalName();
        PName oldPhysicalName = PNameFactory.newName(
                physicalName.toString().replace(QueryConstants.NAMESPACE_SEPARATOR, QueryConstants.NAME_SEPARATOR));
        String oldSchemaName = MetaDataUtil.getViewIndexSequenceSchemaName(oldPhysicalName, false);
        String newSchemaName = MetaDataUtil.getViewIndexSequenceSchemaName(physicalName, true);
        String newSequenceName = MetaDataUtil.getViewIndexSequenceName(physicalName, tenantId, true);
        // create new entry with new schema format
        String upsert = "UPSERT INTO " + PhoenixDatabaseMetaData.SYSTEM_SEQUENCE + " SELECT NULL,\'" + newSchemaName +
            "\',\'" + newSequenceName
                + "\'," + START_WITH + "," + CURRENT_VALUE + "," + INCREMENT_BY + "," + CACHE_SIZE + "," + MIN_VALUE
                + "," + MAX_VALUE + "," + CYCLE_FLAG + "," + LIMIT_REACHED_FLAG + " FROM "
                + PhoenixDatabaseMetaData.SYSTEM_SEQUENCE + " WHERE " + PhoenixDatabaseMetaData.TENANT_ID
                + " IS NULL AND " + PhoenixDatabaseMetaData.SEQUENCE_SCHEMA + " = '" + oldSchemaName + "'";
        connection.createStatement().executeUpdate(upsert);
    }

    private static void updateLink(PhoenixConnection conn, String srcTableName,
            String destTableName, PName schemaName, PName tableName) throws SQLException {
        String updateLinkSql = String.format(UPDATE_LINK, destTableName);
        boolean hasTenantId = conn.getTenantId() != null && conn.getTenantId().getBytes().length!=0;
        if (hasTenantId) {
            updateLinkSql += " AND TENANT_ID  = ? ";
        }
        PreparedStatement updateLinkStatment = conn.prepareStatement(updateLinkSql);
        updateLinkStatment.setString(1, schemaName.getString());
        updateLinkStatment.setString(2, schemaName.getString());
        updateLinkStatment.setString(3, tableName.getString());
        updateLinkStatment.setString(4, srcTableName);
        if (hasTenantId) {
            updateLinkStatment.setString(5, conn.getTenantId().getString());
        }
        updateLinkStatment.execute();
        String deleteLinkSql = DELETE_LINK;
        if (hasTenantId) {
            deleteLinkSql += (" AND TENANT_ID  = ? ");
        }
        PreparedStatement deleteLinkStatment = conn.prepareStatement(deleteLinkSql);
        deleteLinkStatment.setString(1, schemaName.getString());
        deleteLinkStatment.setString(2, schemaName.getString());
        deleteLinkStatment.setString(3, tableName.getString());
        deleteLinkStatment.setString(4, srcTableName);
        if (hasTenantId) {
            deleteLinkStatment.setString(5, conn.getTenantId().getString());
        }
        deleteLinkStatment.execute();
    }
    
    private static void mapChildViewsToNamespace(String connUrl, Properties props, List<TableInfo> viewInfoList)
            throws SQLException, SnapshotCreationException, IllegalArgumentException, IOException,
            InterruptedException {
        String tenantId = null;
        String prevTenantId = null;
        PhoenixConnection conn = null;
        for (TableInfo viewInfo : viewInfoList) {
            tenantId = viewInfo.getTenantId()!=null ? Bytes.toString(viewInfo.getTenantId()) : null;
            String viewName = SchemaUtil.getTableName(viewInfo.getSchemaName(), viewInfo.getTableName());
            if (!java.util.Objects.equals(prevTenantId, tenantId)) {
                if (tenantId != null) {
                    props.setProperty(PhoenixRuntime.TENANT_ID_ATTRIB, tenantId);
                } else {
                    props.remove(PhoenixRuntime.TENANT_ID_ATTRIB);
                }
                if (conn!=null)
                    conn.close();
                conn = DriverManager.getConnection(connUrl, props).unwrap(PhoenixConnection.class);
            }
            LOGGER.info(String.format("Upgrading view %s for tenantId %s..", viewName,tenantId));
            UpgradeUtil.upgradeTable(conn, viewName);
            prevTenantId = tenantId;
        }
    }

    public static void mergeViewIndexIdSequences(ConnectionQueryServices cqs, PhoenixConnection metaConnection)
        throws SQLException{
         /* before PHOENIX-5132, there was a per-tenant sequence to generate view index ids,
           which could cause problems if global and tenant-owned view indexes were mixed for the
           same physical base table. Now there's just one sequence for all view indexes of the same
           physical table, but we have to check to see if there are any legacy sequences, and
           merge them into a single sequence equal to max + 101 (for a safety margin)
           of the largest legacy sequence to avoid collisons.
         */
         //map of physical table names to view index sequences
        Map<String, List<SequenceKey>> sequenceTableMap = new HashMap<>();
        DatabaseMetaData metaData = metaConnection.getMetaData();

        try (ResultSet sequenceRS = metaData.getTables(null, null,
            "%" + MetaDataUtil.VIEW_INDEX_SEQUENCE_NAME_PREFIX + "%",
            new String[] {PhoenixDatabaseMetaData.SEQUENCE_TABLE_TYPE})) {
            while (sequenceRS.next()) {
                String tenantId = sequenceRS.getString(TABLE_CAT);
                String schemaName = sequenceRS.getString(TABLE_SCHEM);
                String sequenceName = sequenceRS.getString(TABLE_NAME);
                int numBuckets = sequenceRS.getInt(SALT_BUCKETS);
                SequenceKey key = new SequenceKey(tenantId, schemaName, sequenceName, numBuckets);
                String baseTableName;
                //under the old naming convention, view index sequences
                // of non-namespace mapped tables stored their physical table name in the sequence schema for
                //some reason. Namespace-mapped tables stored it in the sequence name itself.
                //Note the difference between VIEW_INDEX_SEQUENCE_PREFIX (_SEQ_)
                //and VIEW_INDEX_SEQUENCE_NAME_PREFIX (_ID_)
                if (schemaName != null && schemaName.contains(MetaDataUtil.VIEW_INDEX_SEQUENCE_PREFIX)) {
                    baseTableName = schemaName.replace(MetaDataUtil.VIEW_INDEX_SEQUENCE_PREFIX, "");
                } else {
                    baseTableName = SchemaUtil.getTableName(schemaName,
                        sequenceName.replace(MetaDataUtil.VIEW_INDEX_SEQUENCE_NAME_PREFIX, ""));
                }
                if (!sequenceTableMap.containsKey(baseTableName)) {
                    sequenceTableMap.put(baseTableName, new ArrayList<SequenceKey>());
                }
                sequenceTableMap.get(baseTableName).add(key);
            }
        }
        for (String baseTableName : sequenceTableMap.keySet()){
            Map<SequenceKey, Long> currentSequenceValues = new HashMap<SequenceKey, Long>();
            long maxViewIndexId = Long.MIN_VALUE;
            PName name = PNameFactory.newName(baseTableName);
            boolean hasNamespaceMapping =
                SchemaUtil.isNamespaceMappingEnabled(null, cqs.getConfiguration()) ||
                    cqs.getProps().getBoolean(QueryServices.IS_NAMESPACE_MAPPING_ENABLED, false);
            List<SequenceKey> existingSequenceKeys = sequenceTableMap.get(baseTableName);
            for (SequenceKey sequenceKey : existingSequenceKeys){
                long[] currentValueArray = new long[1];
                SQLException[] sqlExceptions = new SQLException[1];
                cqs.incrementSequences(
                    Lists.newArrayList(new SequenceAllocation(sequenceKey, 1L)),
                    EnvironmentEdgeManager.currentTimeMillis(),
                    currentValueArray, new SQLException[1]);

                if (sqlExceptions[0] != null) {
                    LOGGER.error("Unable to convert view index sequence because of error. " +
                        "It will need to be converted manually, " +
                        " or there's a risk that two view indexes of the same base table " +
                        "will have colliding view index ids.", sqlExceptions[0]);
                    continue;
                }
                if (currentValueArray[0] > maxViewIndexId){
                    maxViewIndexId = currentValueArray[0];
                }
                currentSequenceValues.put(sequenceKey, currentValueArray[0]);
            }
            //just in case someone is creating a view index RIGHT NOW, increment maxViewIndexId
            //by 100 to make very sure there are no collisions
            maxViewIndexId += 100;
            try {
                //In one case (namespaced-mapped base table, global view index), the new sequence
                //is the same as the old sequence, so rather than create it we just increment it
                //to the right value.
                SequenceKey newSequenceKey = new SequenceKey(null, MetaDataUtil.getViewIndexSequenceSchemaName(name, hasNamespaceMapping),
                    MetaDataUtil.getViewIndexSequenceName(name, null, hasNamespaceMapping), cqs.getSequenceSaltBuckets());
                if (currentSequenceValues.containsKey(newSequenceKey)){
                    long incrementValue = maxViewIndexId - currentSequenceValues.get(newSequenceKey);
                    SQLException[] incrementExceptions = new SQLException[1];
                    List<SequenceAllocation> incrementAllocations = Lists.newArrayList(new SequenceAllocation(newSequenceKey, incrementValue));
                    cqs.incrementSequences(incrementAllocations, EnvironmentEdgeManager.currentTimeMillis(),
                        new long[1], incrementExceptions);
                    if (incrementExceptions[0] != null){
                        throw incrementExceptions[0];
                    }
                } else {
                    cqs.createSequence(null, newSequenceKey.getSchemaName(),
                        newSequenceKey.getSequenceName(), maxViewIndexId, 1, 1,
                        Long.MIN_VALUE, Long.MAX_VALUE,
                        false, EnvironmentEdgeManager.currentTimeMillis());
                }
            } catch(SequenceAlreadyExistsException sae) {
                LOGGER.info("Tried to create view index sequence "
                    + SchemaUtil.getTableName(sae.getSchemaName(), sae.getSequenceName()) +
                    " during upgrade but it already existed. This is probably fine.");
            }
        }
    }

    public static final String getSysCatalogSnapshotName(long currentSystemTableTimestamp) {
        String tableString = SYSTEM_CATALOG_NAME;
        Format formatter = new SimpleDateFormat("yyyyMMddHHmmss");
        String date = formatter.format(new Date(System.currentTimeMillis()));
        String upgradingFrom = getVersion(currentSystemTableTimestamp);
        return "SNAPSHOT_" + tableString + "_" + upgradingFrom + "_TO_" + CURRENT_CLIENT_VERSION + "_" + date;
    }
    
    public static boolean isNoUpgradeSet(Properties props) {
        return Boolean.compare(true, Boolean.valueOf(props.getProperty(DO_NOT_UPGRADE))) == 0;
    }
    
    public static void doNotUpgradeOnFirstConnection(Properties props) {
        props.setProperty(DO_NOT_UPGRADE, String.valueOf(true));
    }
}