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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2018/01/04 18:09:00 UTC
[jira] [Commented] (SPARK-22961) Constant columns no longer picked
as constraints in 2.3
[ https://issues.apache.org/jira/browse/SPARK-22961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16311771#comment-16311771 ]
Apache Spark commented on SPARK-22961:
--------------------------------------
User 'adrian-ionescu' has created a pull request for this issue:
https://github.com/apache/spark/pull/20155
> Constant columns no longer picked as constraints in 2.3
> -------------------------------------------------------
>
> Key: SPARK-22961
> URL: https://issues.apache.org/jira/browse/SPARK-22961
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0, 3.0.0
> Reporter: Adrian Ionescu
> Labels: constraints, optimizer, regression
>
> We're no longer picking up {{x = 2}} as a constraint from something like {{df.withColumn("x", lit(2))}}
> The unit test below succeeds in {{branch-2.2}}:
> {code}
> test("constraints should be inferred from aliased literals") {
> val originalLeft = testRelation.subquery('left).as("left")
> val optimizedLeft = testRelation.subquery('left).where(IsNotNull('a) && 'a <=> 2).as("left")
> val right = Project(Seq(Literal(2).as("two")), testRelation.subquery('right)).as("right")
> val condition = Some("left.a".attr === "right.two".attr)
> val original = originalLeft.join(right, Inner, condition)
> val correct = optimizedLeft.join(right, Inner, condition)
> comparePlans(Optimize.execute(original.analyze), correct.analyze)
> }
> {code}
> but fails in {{branch-2.3}} with:
> {code}
> == FAIL: Plans do not match ===
> 'Join Inner, (two#0 = a#0) 'Join Inner, (two#0 = a#0)
> !:- Filter isnotnull(a#0) :- Filter ((2 <=> a#0) && isnotnull(a#0))
> : +- LocalRelation <empty>, [a#0, b#0, c#0] : +- LocalRelation <empty>, [a#0, b#0, c#0]
> +- Project [2 AS two#0] +- Project [2 AS two#0]
> +- LocalRelation <empty>, [a#0, b#0, c#0] +- LocalRelation <empty>, [a#0, b#0, c#0]
> {code}
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