lsyldliu commented on code in PR #25880: URL: https://github.com/apache/flink/pull/25880#discussion_r1908095068
########## flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/operations/materializedtable/AlterMaterializedTableAsQueryOperation.java: ########## @@ -0,0 +1,142 @@ +/* + * 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.flink.table.operations.materializedtable; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.table.api.Schema; +import org.apache.flink.table.api.ValidationException; +import org.apache.flink.table.api.internal.TableResultImpl; +import org.apache.flink.table.api.internal.TableResultInternal; +import org.apache.flink.table.catalog.CatalogMaterializedTable; +import org.apache.flink.table.catalog.Column; +import org.apache.flink.table.catalog.ObjectIdentifier; +import org.apache.flink.table.catalog.ResolvedCatalogBaseTable; +import org.apache.flink.table.catalog.ResolvedCatalogMaterializedTable; +import org.apache.flink.table.catalog.ResolvedSchema; +import org.apache.flink.table.catalog.TableChange; +import org.apache.flink.table.operations.Operation; +import org.apache.flink.table.operations.OperationUtils; +import org.apache.flink.table.operations.QueryOperation; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import java.util.stream.Collectors; + +import static org.apache.flink.table.catalog.CatalogBaseTable.TableKind.MATERIALIZED_TABLE; + +/** Operation to describe an ALTER MATERIALIZED TABLE AS query operation. */ +@Internal +public class AlterMaterializedTableAsQueryOperation extends AlterMaterializedTableOperation { + + protected final ObjectIdentifier tableIdentifier; + + private final QueryOperation queryOperation; + + public AlterMaterializedTableAsQueryOperation( + ObjectIdentifier tableIdentifier, QueryOperation queryOperation) { + super(tableIdentifier); + this.tableIdentifier = tableIdentifier; + this.queryOperation = queryOperation; + } + + public QueryOperation getQueryOperation() { + return queryOperation; + } + + @Override + public TableResultInternal execute(Context ctx) { + ResolvedCatalogBaseTable<?> resolvedCatalogBaseTable = + ctx.getCatalogManager().getTableOrError(tableIdentifier).getResolvedTable(); + if (MATERIALIZED_TABLE != resolvedCatalogBaseTable.getTableKind()) { + throw new ValidationException( + String.format( + "Table %s is not a materialized table, does not support materialized table related operation.", + tableIdentifier)); + } + + ResolvedCatalogMaterializedTable oldResolvedMaterializedTable = + (ResolvedCatalogMaterializedTable) resolvedCatalogBaseTable; + + // validate new schema and derived origin primary key and watermark spec + ResolvedSchema resolvedQuerySchema = queryOperation.getResolvedSchema(); + ResolvedSchema oldResolvedSchema = oldResolvedMaterializedTable.getResolvedSchema(); + List<TableChange> tableChanges = + validateAndExtractNewColumns(oldResolvedSchema, resolvedQuerySchema).stream() + .map(TableChange::add) + .collect(Collectors.toList()); + ResolvedSchema newResolvedSchema = + new ResolvedSchema( + resolvedQuerySchema.getColumns(), + oldResolvedSchema.getWatermarkSpecs(), + oldResolvedSchema.getPrimaryKey().orElse(null)); + Schema newSchema = Schema.newBuilder().fromResolvedSchema(newResolvedSchema).build(); + + // update schema and definition query + String definitionQuery = queryOperation.asSerializableString(); + CatalogMaterializedTable catalogMaterializedTable = + oldResolvedMaterializedTable.getOrigin().copy(newSchema, definitionQuery); + + ResolvedCatalogMaterializedTable newResolvedMaterializedTable = + new ResolvedCatalogMaterializedTable(catalogMaterializedTable, newResolvedSchema); + ctx.getCatalogManager() + .alterTable(newResolvedMaterializedTable, tableChanges, tableIdentifier, false); + + return TableResultImpl.TABLE_RESULT_OK; + } + + @Override + public String asSummaryString() { + Map<String, Object> params = new LinkedHashMap<>(); + params.put("identifier", tableIdentifier); + return OperationUtils.formatWithChildren( + "ALTER MATERIALIZED TABLE", + params, + Collections.singletonList(queryOperation), + Operation::asSummaryString); + } + + private List<Column> validateAndExtractNewColumns( + ResolvedSchema oldSchema, ResolvedSchema newSchema) { + List<Column> newAddedColumns = new ArrayList<>(); + + if (oldSchema.getColumns().size() > newSchema.getColumns().size()) { + throw new ValidationException( + "Cannot alter table. The new schema has fewer columns than the original schema."); + } + + for (int i = 0; i < oldSchema.getColumns().size(); i++) { + Column oldColumn = oldSchema.getColumns().get(i); + Column newColumn = newSchema.getColumns().get(i); + if (!oldColumn.equals(newColumn)) { + throw new ValidationException( + String.format( + "Cannot alter table. The schema of existing column %s has changed.", + oldColumn.getName())); + } + } + for (int i = oldSchema.getColumns().size(); i < newSchema.getColumns().size(); i++) { + Column newColumn = newSchema.getColumns().get(i); Review Comment: Can you help create a jira issue to track it? I think we should forbid the duplicated name case. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
