[SPARK-22489] Shouldn't change broadcast join buildSide if user clearly specified

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.0
• Fix Version/s: 2.3.0
• Component/s: SQL
• Assignee: Yuming Wang
• Reporter: Yuming Wang
• Created: 10/Nov/17 05:54
• Updated: 31/Jan/18 16:48
• Resolved: 30/Nov/17 23:38

Description

How to reproduce:

import org.apache.spark.sql.execution.joins.BroadcastHashJoinExec

spark.createDataFrame(Seq((1, "4"), (2, "2"))).toDF("key", "value").createTempView("table1")
spark.createDataFrame(Seq((1, "1"), (2, "2"))).toDF("key", "value").createTempView("table2")

val bl = sql(s"SELECT /*+ MAPJOIN(t1) */ * FROM table1 t1 JOIN table2 t2 ON t1.key = t2.key").queryExecution.executedPlan

println(bl.children.head.asInstanceOf[BroadcastHashJoinExec].buildSide)

The result is BuildRight, but should be BuildLeft.

Issue Links

• links to: [Github] Pull Request #19714 (wangyum)
• links to: [Github] Pull Request #19858 (wangyum)