| /* |
| * 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.ignite.internal.catalog.commands; |
| |
| import static org.apache.ignite.internal.catalog.CatalogParamsValidationUtils.validateIdentifier; |
| import static org.apache.ignite.internal.catalog.commands.CatalogUtils.schemaOrThrow; |
| import static org.apache.ignite.internal.catalog.commands.CatalogUtils.tableOrThrow; |
| import static org.apache.ignite.internal.lang.IgniteStringFormatter.format; |
| import static org.apache.ignite.internal.util.CollectionUtils.copyOrNull; |
| import static org.apache.ignite.internal.util.CollectionUtils.nullOrEmpty; |
| |
| import java.util.List; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| import org.apache.ignite.internal.catalog.Catalog; |
| import org.apache.ignite.internal.catalog.CatalogCommand; |
| import org.apache.ignite.internal.catalog.CatalogValidationException; |
| import org.apache.ignite.internal.catalog.descriptors.CatalogHashIndexDescriptor; |
| import org.apache.ignite.internal.catalog.descriptors.CatalogIndexColumnDescriptor; |
| import org.apache.ignite.internal.catalog.descriptors.CatalogIndexDescriptor; |
| import org.apache.ignite.internal.catalog.descriptors.CatalogSchemaDescriptor; |
| import org.apache.ignite.internal.catalog.descriptors.CatalogSortedIndexDescriptor; |
| import org.apache.ignite.internal.catalog.descriptors.CatalogTableDescriptor; |
| import org.apache.ignite.internal.catalog.storage.DropColumnsEntry; |
| import org.apache.ignite.internal.catalog.storage.UpdateEntry; |
| |
| /** |
| * A command that deletes columns from the table. |
| */ |
| public class AlterTableDropColumnCommand extends AbstractTableCommand { |
| /** Returns builder to create a command to delete columns from the table. */ |
| public static AlterTableDropColumnCommandBuilder builder() { |
| return new Builder(); |
| } |
| |
| private final Set<String> columns; |
| |
| /** |
| * Constructs the object. |
| * |
| * @param tableName Name of the table to delete columns from. Should not be null or blank. |
| * @param schemaName Name of the schema the table of interest belongs to. Should not be null or blank. |
| * @param ifTableExists Flag indicating whether the {@code IF EXISTS} was specified. |
| * @param columns Set of the columns to delete. There should be at least one column. |
| * @throws CatalogValidationException if any of restrictions above is violated. |
| */ |
| private AlterTableDropColumnCommand( |
| String tableName, |
| String schemaName, |
| boolean ifTableExists, |
| Set<String> columns |
| ) throws CatalogValidationException { |
| super(schemaName, tableName, ifTableExists); |
| |
| // Set.copyOf() will throw NPE if any elements of the given set is null |
| validate(columns); |
| |
| this.columns = copyOrNull(columns); |
| } |
| |
| @Override |
| public List<UpdateEntry> get(Catalog catalog) { |
| CatalogSchemaDescriptor schema = schemaOrThrow(catalog, schemaName); |
| |
| CatalogTableDescriptor table = tableOrThrow(schema, tableName); |
| |
| Set<String> indexedColumns = aliveIndexesForTable(catalog, table.id()) |
| .flatMap(AlterTableDropColumnCommand::indexColumnNames) |
| .collect(Collectors.toSet()); |
| |
| // To validate always in the same order let's sort given columns |
| columns.stream().sorted().forEach(columnName -> { |
| if (table.column(columnName) == null) { |
| throw new CatalogValidationException(format( |
| "Column with name '{}' not found in table '{}.{}'", columnName, schemaName, tableName)); |
| } |
| |
| if (table.isPrimaryKeyColumn(columnName)) { |
| throw new CatalogValidationException(format("Deleting column `{}` belonging to primary key is not allowed", columnName)); |
| } |
| |
| if (indexedColumns.contains(columnName)) { |
| List<String> indexesNames = aliveIndexesForTable(catalog, table.id()) |
| .filter(index -> indexColumnNames(index).anyMatch(columnName::equals)) |
| .map(CatalogIndexDescriptor::name) |
| .collect(Collectors.toList()); |
| |
| throw new CatalogValidationException(format( |
| "Deleting column '{}' used by index(es) {}, it is not allowed", columnName, indexesNames)); |
| } |
| }); |
| |
| return List.of( |
| new DropColumnsEntry(table.id(), columns) |
| ); |
| } |
| |
| private static Stream<CatalogIndexDescriptor> aliveIndexesForTable(Catalog catalog, int tableId) { |
| return catalog.indexes(tableId).stream().filter(index -> index.status().isAlive()); |
| } |
| |
| private static Stream<String> indexColumnNames(CatalogIndexDescriptor index) { |
| switch (index.indexType()) { |
| case HASH: |
| return ((CatalogHashIndexDescriptor) index).columns().stream(); |
| |
| case SORTED: |
| return ((CatalogSortedIndexDescriptor) index).columns().stream().map(CatalogIndexColumnDescriptor::name); |
| |
| default: |
| throw new AssertionError(index.indexType().toString()); |
| } |
| } |
| |
| private static void validate(Set<String> columns) { |
| if (nullOrEmpty(columns)) { |
| throw new CatalogValidationException("Columns not specified"); |
| } |
| |
| for (String name : columns) { |
| validateIdentifier(name, "Name of the column"); |
| } |
| } |
| |
| /** |
| * Implementation of {@link AlterTableDropColumnCommandBuilder}. |
| */ |
| private static class Builder implements AlterTableDropColumnCommandBuilder { |
| private Set<String> columns; |
| |
| private String schemaName; |
| |
| private String tableName; |
| |
| private boolean ifTableExists; |
| |
| @Override |
| public AlterTableDropColumnCommandBuilder schemaName(String schemaName) { |
| this.schemaName = schemaName; |
| |
| return this; |
| } |
| |
| @Override |
| public AlterTableDropColumnCommandBuilder tableName(String tableName) { |
| this.tableName = tableName; |
| |
| return this; |
| } |
| |
| @Override |
| public AlterTableDropColumnCommandBuilder ifTableExists(boolean ifTableExists) { |
| this.ifTableExists = ifTableExists; |
| |
| return this; |
| } |
| |
| @Override |
| public AlterTableDropColumnCommandBuilder columns(Set<String> columns) { |
| this.columns = columns; |
| |
| return this; |
| } |
| |
| @Override |
| public CatalogCommand build() { |
| return new AlterTableDropColumnCommand( |
| tableName, |
| schemaName, |
| ifTableExists, |
| columns |
| ); |
| } |
| } |
| } |