Wenchen Fan created SPARK-20897:
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Summary: 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
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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