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https://issues.apache.org/jira/browse/SPARK-18063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15597304#comment-15597304
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Apache Spark commented on SPARK-18063:
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User 'jiangxb1987' has created a pull request for this issue:
https://github.com/apache/spark/pull/15597
> Failed to infer constraints over multiple aliases
> -------------------------------------------------
>
> Key: SPARK-18063
> URL: https://issues.apache.org/jira/browse/SPARK-18063
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Jiang Xingbo
> Priority: Minor
>
> The `UnaryNode.getAliasedConstraints` function fails to replace all
> expressions by their alias where constraints contains more than one
> expression to be replaced. For example:
> {code}
> val tr = LocalRelation('a.int, 'b.string, 'c.int)
> val multiAlias = tr.where('a === 'c + 10).select('a.as('x), 'c.as('y))
> multiAlias.analyze.constraints
> {code}
> currently outputs:
> {code}
> ExpressionSet(Seq(
> IsNotNull(resolveColumn(multiAlias.analyze, "x")),
> IsNotNull(resolveColumn(multiAlias.analyze, "y"))
> )
> {code}
> The constraint {code}resolveColumn(multiAlias.analyze, "x") ===
> resolveColumn(multiAlias.analyze, "y") + 10){code} is missing.
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