leanken commented on a change in pull request #29104: URL: https://github.com/apache/spark/pull/29104#discussion_r456996725
########## File path: sql/core/src/main/scala/org/apache/spark/sql/execution/joins/BroadcastNullAwareHashJoinExec.scala ########## @@ -0,0 +1,163 @@ +/* + * 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.joins + +import org.apache.spark.broadcast.Broadcast +import org.apache.spark.rdd.RDD +import org.apache.spark.sql.catalyst.InternalRow +import org.apache.spark.sql.catalyst.expressions._ +import org.apache.spark.sql.catalyst.optimizer.{BuildRight, BuildSide} +import org.apache.spark.sql.catalyst.plans._ +import org.apache.spark.sql.catalyst.plans.physical._ +import org.apache.spark.sql.execution.{ExplainUtils, SparkPlan} +import org.apache.spark.sql.execution.metric.SQLMetrics +import org.apache.spark.sql.internal.SQLConf + +private case class NotInSubqueryHashJoinParams( + buildSideRelation: HashedRelation, + buildSideIsNullExists: Boolean, + buildSideIsEmpty: Boolean, + streamedSideKey: Attribute, + streamedSideKeyIndex: Int) + +object NotInSubqueryConditionPattern { + def singleColumnPatternMatch(condition: Option[Expression]): (Boolean, Attribute, Attribute) = { + condition.get match { + case Or(EqualTo(leftAttr: AttributeReference, rightAttr: AttributeReference), + IsNull(EqualTo(tmpLeft: AttributeReference, tmpRight: AttributeReference))) + if leftAttr.semanticEquals(tmpLeft) && rightAttr.semanticEquals(tmpRight) => + (true, leftAttr, rightAttr) + case _ => (false, null, null) + } + } +} + +case class BroadcastNullAwareHashJoinExec( + left: SparkPlan, + right: SparkPlan, + buildSide: BuildSide, + joinType: JoinType, + condition: Option[Expression]) extends BaseJoinExec { + + // TODO support multi column not in subquery in future. + // See. http://www.vldb.org/pvldb/vol2/vldb09-423.pdf Section 6 + // multi-column null aware anti join is much more complicated than single column ones. + require(right.output.length == 1, "not in subquery hash join optimize only single column.") + require(joinType == LeftAnti, "joinType must be LeftAnti.") + require(buildSide == BuildRight, "buildSide must be BuildRight.") + require(SQLConf.get.notInSubqueryHashJoinEnabled, + "notInSubqueryHashJoinEnabled must turn on for BroadcastNullAwareHashJoinExec.") + + override def leftKeys: Seq[Expression] = Nil + override def rightKeys: Seq[Expression] = Nil + + override lazy val metrics = Map( + "numOutputRows" -> SQLMetrics.createMetric(sparkContext, "number of output rows")) + + private val (streamed, broadcast) = (left, right) + + override def simpleStringWithNodeId(): String = { + val opId = ExplainUtils.getOpId(this) + s"$nodeName $joinType ${buildSide} ($opId)".trim + } + + override def requiredChildDistribution: Seq[Distribution] = { + UnspecifiedDistribution :: BroadcastDistribution(IdentityBroadcastMode) :: Nil + } + + private[this] def genResultProjection: UnsafeProjection = { + UnsafeProjection.create(output, output) + } + + override def output: Seq[Attribute] = { + left.output + } + + private def buildParams(buildSideRows: Array[InternalRow]): NotInSubqueryHashJoinParams = { + val (_, leftAttr, rightAttr) = + NotInSubqueryConditionPattern.singleColumnPatternMatch(condition) + + val leftNotInKeyFound = left.output.exists(_.semanticEquals(leftAttr)) + val (streamedKey, streamedKeyIndex) = if (leftNotInKeyFound) { + (leftAttr, AttributeSeq(left.output).indexOf(leftAttr.exprId)) + } else { + (rightAttr, AttributeSeq(left.output).indexOf(rightAttr.exprId)) + } + + NotInSubqueryHashJoinParams( + HashedRelation(buildSideRows.iterator, + BindReferences.bindReferences[Expression]( + Seq(right.output.head), AttributeSeq(right.output)), + buildSideRows.length), + buildSideRows.exists(row => row.isNullAt(0)), + buildSideRows.isEmpty, + streamedKey, + streamedKeyIndex + ) + } + + private def leftAntiNullAwareJoin( + relation: Broadcast[Array[InternalRow]]): RDD[InternalRow] = { + val params = buildParams(relation.value) + streamed.execute().mapPartitionsInternal { streamedIter => + if (params.buildSideIsEmpty) { + streamedIter + } else if (params.buildSideIsNullExists) { + Iterator.empty + } else { + val keyGenerator = UnsafeProjection.create( + BindReferences.bindReferences[Expression]( + Seq(params.streamedSideKey), + AttributeSeq(left.output)) + ) + streamedIter.filter(row => { + val streamedRowIsNull = row.isNullAt(params.streamedSideKeyIndex) + val lookupRow: UnsafeRow = keyGenerator(row) + val notInKeyEqual = params.buildSideRelation.get(lookupRow) != null + if (!streamedRowIsNull && !notInKeyEqual) { + true + } else { + false + } + }) + } + } + } + + protected override def doExecute(): RDD[InternalRow] = { Review comment: done ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
