Github user manishgupta88 commented on a diff in the pull request: https://github.com/apache/carbondata/pull/2990#discussion_r242869441 --- Diff: integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/schema/CarbonAlterTableColRenameDataTypeChangeCommand.scala --- @@ -0,0 +1,329 @@ +/* + * 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.spark.sql.execution.command.schema + +import scala.collection.JavaConverters._ +import scala.collection.mutable + +import org.apache.spark.sql.{CarbonEnv, Row, SparkSession} +import org.apache.spark.sql.execution.command.{AlterTableColRenameAndDataTypeChangeModel, DataTypeInfo, MetadataCommand} +import org.apache.spark.sql.hive.CarbonSessionCatalog +import org.apache.spark.util.AlterTableUtil + +import org.apache.carbondata.common.exceptions.sql.MalformedCarbonCommandException +import org.apache.carbondata.common.logging.LogServiceFactory +import org.apache.carbondata.core.features.TableOperation +import org.apache.carbondata.core.locks.{ICarbonLock, LockUsage} +import org.apache.carbondata.core.metadata.converter.ThriftWrapperSchemaConverterImpl +import org.apache.carbondata.core.metadata.datatype.DecimalType +import org.apache.carbondata.core.metadata.schema.table.CarbonTable +import org.apache.carbondata.core.metadata.schema.table.column.CarbonColumn +import org.apache.carbondata.events.{AlterTableColRenameAndDataTypeChangePostEvent, AlterTableColRenameAndDataTypeChangePreEvent, OperationContext, OperationListenerBus} +import org.apache.carbondata.format.{ColumnSchema, SchemaEvolutionEntry, TableInfo} +import org.apache.carbondata.spark.util.DataTypeConverterUtil + +private[sql] case class CarbonAlterTableColRenameDataTypeChangeCommand( + alterTableColRenameAndDataTypeChangeModel: AlterTableColRenameAndDataTypeChangeModel) + extends MetadataCommand { + + override def processMetadata(sparkSession: SparkSession): Seq[Row] = { + val LOGGER = LogServiceFactory.getLogService(this.getClass.getCanonicalName) + val tableName = alterTableColRenameAndDataTypeChangeModel.tableName + val dbName = alterTableColRenameAndDataTypeChangeModel.databaseName + .getOrElse(sparkSession.catalog.currentDatabase) + var isColumnRenameOnly = false + var isDataTypeChangeOnly = false + var isBothColRenameAndDataTypeChange = false --- End diff -- Using only 1 flag can serve the required purpose of code. So make use of only 2 flags `isDataTypeChangeOnly ` and modify the code logic accordingly. You can use the rename flag from `alterTableColRenameAndDataTypeChangeModel` model
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