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https://issues.apache.org/jira/browse/SPARK-14040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15207294#comment-15207294
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Sunitha Kambhampati commented on SPARK-14040:
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I can reproduce this on my master ( v2.0 snapshot, synced to today). I tried
the first scenario from the description.
> Null-safe and equality join produces incorrect result with filtered dataframe
> -----------------------------------------------------------------------------
>
> Key: SPARK-14040
> URL: https://issues.apache.org/jira/browse/SPARK-14040
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.0
> Environment: Ubuntu Linux 15.10
> Reporter: Denton Cockburn
>
> Initial issue reported here:
> http://stackoverflow.com/questions/36131942/spark-join-produces-wrong-results
> val b = Seq(("a", "b", 1), ("a", "b", 2)).toDF("a", "b", "c")
> val a = b.where("c = 1").withColumnRenamed("a",
> "filta").withColumnRenamed("b", "filtb")
> a.join(b, $"filta" <=> $"a" and $"filtb" <=> $"b" and a("c") <=>
> b("c"), "left_outer").show
> Produces 2 rows instead of the expected 1.
> a.withColumn("newc", $"c").join(b, $"filta" === $"a" and $"filtb" ===
> $"b" and $"newc" === b("c"), "left_outer").show
> Also produces 2 rows instead of the expected 1.
> The only one that seemed to work correctly was:
> a.join(b, $"filta" === $"a" and $"filtb" === $"b" and a("c") ===
> b("c"), "left_outer").show
> But that produced a warning for :
> WARN Column: Constructing trivially true equals predicate, 'c#18232 =
> c#18232'
> As pointed out by commenter zero323:
> "The second behavior looks indeed like a bug related to the fact that you
> still have a.c in your data. It looks like it is picked downstream before b.c
> and the evaluated condition is actually a.newc = a.c"
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