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https://issues.apache.org/jira/browse/SPARK-20897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-20897.
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Resolution: Fixed
Fix Version/s: 2.2.0
> cached self-join should not fail
> --------------------------------
>
> Key: SPARK-20897
> URL: https://issues.apache.org/jira/browse/SPARK-20897
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Wenchen Fan
> Assignee: Wenchen Fan
> Fix For: 2.2.0
>
>
> code to reproduce this bug:
> {code}
> // force to plan sort merge join
> spark.conf.set("spark.sql.autoBroadcastJoinThreshold", "0")
> val df = Seq(1 -> "a").toDF("i", "j")
> val df1 = df.as("t1")
> val df2 = df.as("t2")
> assert(df1.join(df2, $"t1.i" === $"t2.i").cache().count() == 1)
> {code}
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