[jira] [Assigned] (SPARK-22916) shouldn't bias towards build right if user does not specify

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22916?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-22916:
------------------------------------

    Assignee:     (was: Apache Spark)

> shouldn't bias towards build right if user does not specify
> -----------------------------------------------------------
>
>                 Key: SPARK-22916
>                 URL: https://issues.apache.org/jira/browse/SPARK-22916
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Feng Liu
>
> This is an issue very similar to SPARK-22489. When there are no broadcast hints, the current spark strategies will prefer to build right, without considering the sizes of the two sides. To reproduce:
> {code:java}
> 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"), (3, "3"))).toDF("key", "value").createTempView("table2")
> val bl = sql(s"SELECT * FROM table1 t1 JOIN table2 t2 ON t1.key = t2.key").queryExecution.executedPlan
> {code}
> The plan is going to broadcast right side (`t2`), even though it is larger.



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