spark RewriteRowLevelCommand 源码
spark RewriteRowLevelCommand 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/RewriteRowLevelCommand.scala
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* 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.
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package org.apache.spark.sql.catalyst.analysis
import scala.collection.mutable
import org.apache.spark.sql.catalyst.expressions.{AttributeReference, ExprId, V2ExpressionUtils}
import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.connector.catalog.SupportsRowLevelOperations
import org.apache.spark.sql.connector.write.{RowLevelOperation, RowLevelOperationInfoImpl, RowLevelOperationTable}
import org.apache.spark.sql.connector.write.RowLevelOperation.Command
import org.apache.spark.sql.execution.datasources.v2.DataSourceV2Relation
import org.apache.spark.sql.util.CaseInsensitiveStringMap
trait RewriteRowLevelCommand extends Rule[LogicalPlan] {
protected def buildOperationTable(
table: SupportsRowLevelOperations,
command: Command,
options: CaseInsensitiveStringMap): RowLevelOperationTable = {
val info = RowLevelOperationInfoImpl(command, options)
val operation = table.newRowLevelOperationBuilder(info).build()
RowLevelOperationTable(table, operation)
}
protected def buildRelationWithAttrs(
relation: DataSourceV2Relation,
table: RowLevelOperationTable,
metadataAttrs: Seq[AttributeReference]): DataSourceV2Relation = {
val attrs = dedupAttrs(relation.output ++ metadataAttrs)
relation.copy(table = table, output = attrs)
}
protected def dedupAttrs(attrs: Seq[AttributeReference]): Seq[AttributeReference] = {
val exprIds = mutable.Set.empty[ExprId]
attrs.flatMap { attr =>
if (exprIds.contains(attr.exprId)) {
None
} else {
exprIds += attr.exprId
Some(attr)
}
}
}
protected def resolveRequiredMetadataAttrs(
relation: DataSourceV2Relation,
operation: RowLevelOperation): Seq[AttributeReference] = {
V2ExpressionUtils.resolveRefs[AttributeReference](
operation.requiredMetadataAttributes,
relation)
}
}
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