ramitg254 commented on code in PR #5715: URL: https://github.com/apache/hive/pull/5715#discussion_r2019789175
########## ql/src/java/org/apache/hadoop/hive/ql/ddl/table/column/drop/AlterTableDropColumnAnalyser.java: ########## @@ -0,0 +1,62 @@ +/* + * 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.hadoop.hive.ql.ddl.table.column.drop; + +import java.util.Map; + +import org.apache.hadoop.hive.common.TableName; +import org.apache.hadoop.hive.ql.QueryState; +import org.apache.hadoop.hive.ql.ddl.DDLWork; +import org.apache.hadoop.hive.ql.ddl.DDLSemanticAnalyzerFactory.DDLType; +import org.apache.hadoop.hive.ql.ddl.table.AbstractAlterTableAnalyzer; +import org.apache.hadoop.hive.ql.exec.TaskFactory; +import org.apache.hadoop.hive.ql.io.AcidUtils; +import org.apache.hadoop.hive.ql.metadata.Table; +import org.apache.hadoop.hive.ql.parse.ASTNode; +import org.apache.hadoop.hive.ql.parse.HiveParser; +import org.apache.hadoop.hive.ql.parse.SemanticException; + +/** + * Analyzer for drop column command. + */ +@DDLType(types = HiveParser.TOK_ALTERTABLE_DROPCOL) +public class AlterTableDropColumnAnalyser extends AbstractAlterTableAnalyzer { + + public AlterTableDropColumnAnalyser(QueryState queryState) throws SemanticException { + super(queryState); + } + + @Override + protected void analyzeCommand(TableName tableName, Map<String, String> partitionSpec, ASTNode command) + throws SemanticException { + boolean ifExists = (command.getFirstChildWithType(HiveParser.TOK_IFEXISTS)!=null); Review Comment: removed parenthesis ########## ql/src/java/org/apache/hadoop/hive/ql/ddl/table/column/drop/AlterTableDropColumnOperation.java: ########## @@ -0,0 +1,93 @@ +/* + * 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.hadoop.hive.ql.ddl.table.column.drop; + +import com.google.common.collect.ImmutableSet; +import org.apache.hadoop.hive.metastore.api.FieldSchema; +import org.apache.hadoop.hive.metastore.api.StorageDescriptor; +import org.apache.hadoop.hive.ql.ErrorMsg; +import org.apache.hadoop.hive.ql.ddl.DDLOperationContext; +import org.apache.hadoop.hive.ql.ddl.table.AbstractAlterTableOperation; +import org.apache.hadoop.hive.ql.ddl.table.AlterTableUtils; +import org.apache.hadoop.hive.ql.io.orc.OrcSerde; +import org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe; +import org.apache.hadoop.hive.ql.metadata.HiveException; +import org.apache.hadoop.hive.ql.metadata.Partition; +import org.apache.hadoop.hive.ql.metadata.Table; +import org.apache.hadoop.hive.serde2.MetadataTypedColumnsetSerDe; +import org.apache.hadoop.hive.serde2.avro.AvroSerdeUtils; +import org.apache.hadoop.hive.serde2.columnar.ColumnarSerDe; +import org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe; + +import java.util.ArrayList; +import java.util.List; +import java.util.Set; + +/** + * Operation process of dropping column. + */ +public class AlterTableDropColumnOperation extends AbstractAlterTableOperation<AlterTableDropColumnDesc> { + + public AlterTableDropColumnOperation(DDLOperationContext context, AlterTableDropColumnDesc desc) { + super(context, desc); + } + + private static final Set<String> VALID_SERIALIZATION_LIBS = ImmutableSet.of( + MetadataTypedColumnsetSerDe.class.getName(), LazySimpleSerDe.class.getName(), ColumnarSerDe.class.getName(), + ParquetHiveSerDe.class.getName(), OrcSerde.class.getName(), "org.apache.iceberg.mr.hive.HiveIcebergSerDe"); + + @Override + protected void doAlteration(Table table, Partition partition) throws HiveException { + StorageDescriptor sd = getStorageDescriptor(table, partition); + String serializationLib = sd.getSerdeInfo().getSerializationLib(); + AvroSerdeUtils.handleAlterTableForAvro(context.getConf(), serializationLib, table.getTTable().getParameters()); + + if ("org.apache.hadoop.hive.serde.thrift.columnsetSerDe".equals(serializationLib)) { + context.getConsole().printInfo("Dropping column for columnsetSerDe and changing to LazySimpleSerDe"); + sd.getSerdeInfo().setSerializationLib(LazySimpleSerDe.class.getName()); + } + + boolean isOrcSchemaEvolution = serializationLib.equals(OrcSerde.class.getName()) && + AlterTableUtils.isSchemaEvolutionEnabled(table, context.getConf()); + if (isOrcSchemaEvolution) { + throw new HiveException(ErrorMsg.CANNOT_DROP_COLUMN, desc.getDbTableName()); + } + + if (ParquetHiveSerDe.isParquetTable(table) && AlterTableUtils.isSchemaEvolutionEnabled(table, context.getConf()) && + !desc.isCascade() && table.isPartitioned()) { + LOG.warn("Cannot drop column from a partitioned parquet table without the CASCADE option"); + throw new HiveException(ErrorMsg.CANNOT_DROP_COLUMN, desc.getDbTableName()); + } + + List<FieldSchema> cols = new ArrayList<>(sd.getCols()); + int droppingIndex = -1; + for (int i = 0; i < cols.size(); i++) { + if (cols.get(i).getName().equalsIgnoreCase(desc.getColName())) { + droppingIndex = i; + break; + } + } + if(droppingIndex==-1){ + if(desc.isIfExists())return; Review Comment: added braces -- This is an automated message from the Apache Git Service. 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