Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/11403#discussion_r55453649 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala --- @@ -1318,6 +1318,34 @@ class DataFrameSuite extends QueryTest with SharedSQLContext { } + test("reuse exchange") { + withSQLConf("spark.sql.autoBroadcastJoinThreshold" -> "2") { + val df = sqlContext.range(100) + val join = df.join(df, "id") + val plan = join.queryExecution.executedPlan + checkAnswer(join, df) + assert( + join.queryExecution.executedPlan.collect { case e: ShuffleExchange => true }.size === 1) + assert(join.queryExecution.executedPlan.collect { case e: ReusedExchange => true }.size === 1) + val broadcasted = broadcast(join) + val join2 = join.join(broadcasted, "id").join(broadcasted, "id") + checkAnswer(join2, df) + assert( + join2.queryExecution.executedPlan.collect { case e: ShuffleExchange => true }.size === 1) + assert( + join2.queryExecution.executedPlan.collect { case e: BroadcastExchange => true }.size === 1) + assert( + join2.queryExecution.executedPlan.collect { case e: ReusedExchange => true }.size === 4) + } + } + + test("same result on aggregate") { --- End diff -- I almost suggested that it would be nice to have a test to handle the case where `sameResult` is false, but if we were to mess that up then we'd catch it pretty quickly via other test failures.
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