| /** |
| * 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.coprocessor; |
| |
| import static org.apache.phoenix.util.PhoenixRuntime.CONNECTIONLESS; |
| import static org.apache.phoenix.util.PhoenixRuntime.JDBC_PROTOCOL; |
| import static org.apache.phoenix.util.PhoenixRuntime.JDBC_PROTOCOL_SEPARATOR; |
| |
| import java.sql.DriverManager; |
| import java.sql.SQLException; |
| import java.util.BitSet; |
| import java.util.List; |
| |
| import org.apache.phoenix.compile.ColumnResolver; |
| import org.apache.phoenix.compile.CreateTableCompiler; |
| import org.apache.phoenix.compile.ExpressionCompiler; |
| import org.apache.phoenix.compile.FromCompiler; |
| import org.apache.phoenix.compile.StatementContext; |
| import org.apache.phoenix.compile.WhereCompiler; |
| import org.apache.phoenix.expression.Expression; |
| import org.apache.phoenix.jdbc.PhoenixConnection; |
| import org.apache.phoenix.jdbc.PhoenixStatement; |
| import org.apache.phoenix.parse.ParseNode; |
| import org.apache.phoenix.parse.SQLParser; |
| import org.apache.phoenix.parse.SelectStatement; |
| import org.apache.phoenix.schema.ColumnNotFoundException; |
| import org.apache.phoenix.schema.PColumn; |
| import org.apache.phoenix.schema.PColumnImpl; |
| import org.apache.phoenix.schema.PTable; |
| import org.apache.phoenix.schema.PTableImpl; |
| import org.apache.phoenix.schema.TableRef; |
| import org.apache.phoenix.util.MetaDataUtil; |
| |
| import com.google.common.collect.Lists; |
| |
| |
| public class WhereConstantParser { |
| |
| public static PTable addViewInfoToPColumnsIfNeeded(PTable view) throws SQLException { |
| boolean[] viewColumnConstantsMatched = new boolean[view.getColumns().size()]; |
| byte[][] viewColumnConstantsToBe = new byte[view.getColumns().size()][]; |
| if (view.getViewStatement() == null) { |
| return view; |
| } |
| SelectStatement select = new SQLParser(view.getViewStatement()).parseQuery(); |
| ParseNode whereNode = select.getWhere(); |
| ColumnResolver resolver = FromCompiler.getResolver(new TableRef(view)); |
| StatementContext context = new StatementContext(new PhoenixStatement(getConnectionlessConnection()), resolver); |
| Expression expression = null; |
| try { |
| expression = WhereCompiler.compile(context, whereNode); |
| } |
| catch (ColumnNotFoundException e) { |
| // if we could not find a column used in the view statement (which means its was dropped) |
| // this view is not valid any more |
| return null; |
| } |
| CreateTableCompiler.ViewWhereExpressionVisitor visitor = |
| new CreateTableCompiler.ViewWhereExpressionVisitor(view, viewColumnConstantsToBe); |
| expression.accept(visitor); |
| |
| BitSet isViewColumnReferencedToBe = new BitSet(view.getColumns().size()); |
| // Used to track column references in a view |
| ExpressionCompiler expressionCompiler = new CreateTableCompiler.ColumnTrackingExpressionCompiler(context, isViewColumnReferencedToBe); |
| whereNode.accept(expressionCompiler); |
| |
| List<PColumn> result = Lists.newArrayList(); |
| for (PColumn column : PTableImpl.getColumnsToClone(view)) { |
| boolean isViewReferenced = isViewColumnReferencedToBe.get(column.getPosition()); |
| if ( (visitor.isUpdatable() || view.getPKColumns().get(MetaDataUtil.getAutoPartitionColIndex(view)).equals(column)) |
| && viewColumnConstantsToBe[column.getPosition()] != null) { |
| result.add(new PColumnImpl(column, viewColumnConstantsToBe[column.getPosition()], isViewReferenced)); |
| viewColumnConstantsMatched[column.getPosition()]=true; |
| } |
| // If view is not updatable, viewColumnConstants should be empty. We will still |
| // inherit our parent viewConstants, but we have no additional ones. |
| else if(isViewReferenced ){ |
| result.add(new PColumnImpl(column, column.getViewConstant(), isViewReferenced)); |
| } |
| else { |
| result.add(column); |
| } |
| } |
| return PTableImpl.builderWithColumns(view, result) |
| .build(); |
| } |
| |
| private static PhoenixConnection getConnectionlessConnection() throws SQLException { |
| return DriverManager |
| .getConnection(JDBC_PROTOCOL + JDBC_PROTOCOL_SEPARATOR + CONNECTIONLESS) |
| .unwrap(PhoenixConnection.class); |
| } |
| |
| } |