spark ReplaceCharWithVarchar 源码
spark ReplaceCharWithVarchar 代码
文件路径:/sql/core/src/main/scala/org/apache/spark/sql/catalyst/analysis/ReplaceCharWithVarchar.scala
/*
* 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.catalyst.analysis
import org.apache.spark.sql.catalyst.catalog.CatalogTable
import org.apache.spark.sql.catalyst.plans.logical.{AddColumns, AlterColumn, CreateTable, LogicalPlan, ReplaceColumns, ReplaceTable}
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.catalyst.util.CharVarcharUtils
import org.apache.spark.sql.execution.command.{AlterTableAddColumnsCommand, AlterTableChangeColumnCommand, CreateDataSourceTableCommand, CreateTableCommand}
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types.StructType
object ReplaceCharWithVarchar extends Rule[LogicalPlan] {
override def apply(plan: LogicalPlan): LogicalPlan = {
if (!conf.getConf(SQLConf.CHAR_AS_VARCHAR)) return plan
plan.resolveOperators {
// V2 commands
case cmd: CreateTable =>
cmd.copy(tableSchema = replaceCharWithVarcharInSchema(cmd.tableSchema))
case cmd: ReplaceTable =>
cmd.copy(tableSchema = replaceCharWithVarcharInSchema(cmd.tableSchema))
case cmd: AddColumns =>
cmd.copy(columnsToAdd = cmd.columnsToAdd.map { col =>
col.copy(dataType = CharVarcharUtils.replaceCharWithVarchar(col.dataType))
})
case cmd: AlterColumn =>
cmd.copy(dataType = cmd.dataType.map(CharVarcharUtils.replaceCharWithVarchar))
case cmd: ReplaceColumns =>
cmd.copy(columnsToAdd = cmd.columnsToAdd.map { col =>
col.copy(dataType = CharVarcharUtils.replaceCharWithVarchar(col.dataType))
})
// V1 commands
case cmd: CreateTableCommand =>
cmd.copy(table = replaceCharWithVarcharInTableMeta(cmd.table))
case cmd: CreateDataSourceTableCommand =>
cmd.copy(table = replaceCharWithVarcharInTableMeta(cmd.table))
case cmd: AlterTableAddColumnsCommand =>
cmd.copy(colsToAdd = cmd.colsToAdd.map { col =>
col.copy(dataType = CharVarcharUtils.replaceCharWithVarchar(col.dataType))
})
case cmd: AlterTableChangeColumnCommand =>
cmd.copy(newColumn = cmd.newColumn.copy(
dataType = CharVarcharUtils.replaceCharWithVarchar(cmd.newColumn.dataType)))
}
}
private def replaceCharWithVarcharInSchema(schema: StructType): StructType = {
CharVarcharUtils.replaceCharWithVarchar(schema).asInstanceOf[StructType]
}
private def replaceCharWithVarcharInTableMeta(tbl: CatalogTable): CatalogTable = {
tbl.copy(schema = replaceCharWithVarcharInSchema(tbl.schema))
}
}
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