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https://issues.apache.org/jira/browse/SPARK-23195?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-23195.
-----------------------------
    Resolution: Won't Fix

> Hint of cached data is lost
> ---------------------------
>
>                 Key: SPARK-23195
>                 URL: https://issues.apache.org/jira/browse/SPARK-23195
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.1, 2.3.0
>            Reporter: Xiao Li
>            Priority: Major
>
> {noformat}
> withSQLConf(SQLConf.AUTO_BROADCASTJOIN_THRESHOLD.key -> "-1") {
>   val df1 = spark.createDataFrame(Seq((1, "4"), (2, "2"))).toDF("key", 
> "value")
>   val df2 = spark.createDataFrame(Seq((1, "1"), (2, "2"))).toDF("key", 
> "value")
>   broadcast(df2).cache()
>   df2.collect()
>   val df3 = df1.join(df2, Seq("key"), "inner")
>   val numBroadCastHashJoin = df3.queryExecution.executedPlan.collect {
>     case b: BroadcastHashJoinExec => b
>   }.size
>   assert(numBroadCastHashJoin === 1)
> }
> {noformat}
> The broadcast hint is not respected.



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