Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5643#discussion_r34940308
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashSemiJoin.scala
---
@@ -0,0 +1,91 @@
+/*
+ * 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.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.execution.SparkPlan
+
+
+trait HashSemiJoin {
+ self: SparkPlan =>
+ val leftKeys: Seq[Expression]
+ val rightKeys: Seq[Expression]
+ val left: SparkPlan
+ val right: SparkPlan
+ val condition: Option[Expression]
+
+ override def output: Seq[Attribute] = left.output
+
+ @transient protected lazy val rightKeyGenerator: Projection =
+ newProjection(rightKeys, right.output)
+
+ @transient protected lazy val leftKeyGenerator: () => MutableProjection =
+ newMutableProjection(leftKeys, left.output)
+
+ @transient private lazy val boundCondition =
+ newPredicate(condition.getOrElse(Literal(true)), left.output ++
right.output)
+
+ protected def buildKeyHashSet(
+ buildIter: Iterator[InternalRow],
+ copy: Boolean): java.util.Set[InternalRow] = {
--- End diff --
Long term I wonder if its actually a win for us to build just a set instead
of using hashed relation everywhere. We have done a bunch optimization on
HashedRelation to make it serialize faster.
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