[jira] [Commented] (SPARK-23079) Fix query constraints propagation with aliases

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-23079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16326334#comment-16326334 ] 

Apache Spark commented on SPARK-23079:
--------------------------------------

User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/20270

> Fix query constraints propagation with aliases
> ----------------------------------------------
>
>                 Key: SPARK-23079
>                 URL: https://issues.apache.org/jira/browse/SPARK-23079
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.1
>            Reporter: Gengliang Wang
>            Priority: Major
>
> Previously, PR #19201 fix the problem of non-converging constraints.
> After that PR #19149 improve the loop and constraints is inferred only once.
> So the problem of non-converging constraints is gone.
> Also, in current code, the case below will fail.
> ```
> spark.range(5).write.saveAsTable("t")
> val t = spark.read.table("t")
> val left = t.withColumn("xid", $"id" + lit(1)).as("x")
> val right = t.withColumnRenamed("id", "xid").as("y")
> val df = left.join(right, "xid").filter("id = 3").toDF()
> checkAnswer(df, Row(4, 3))
> ```
> Because of `aliasMap` replace all the aliased child. See the test case in PR for details.
>  
>  



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