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From: cloud-fan <git@git.apache.org>
To: reviews@spark.apache.org
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References: <git-pr-14719-spark@git.apache.org>
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Subject: [GitHub] spark pull request #14719: [SPARK-17154][SQL] Wrong result can be returned o...
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Message-Id: <20160907132524.2EDCBDFF58@git1-us-west.apache.org>
Date: Wed,  7 Sep 2016 13:25:24 +0000 (UTC)
archived-at: Wed, 07 Sep 2016 13:25:26 -0000

Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14719#discussion_r77820548
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala ---
    @@ -524,11 +524,16 @@ class Analyzer(
               val newRight = right transformUp {
                 case r if r == oldRelation => newRelation
               } transformUp {
    -            case other => other transformExpressions {
    -              case a: Attribute =>
    -                attributeRewrites.get(a).getOrElse(a).withQualifier(a.qualifier)
    -            }
    +            case other =>
    +              val transformed = other transformExpressions {
    +                case a: Attribute =>
    +                  attributeRewrites.get(a).getOrElse(a).withQualifier(a.qualifier)
    +              }
    +
    +              transformed.setPlanId(other.planId)
    +              transformed
               }
    +          newRight.setPlanId(right.planId)
    --- End diff --
    
    I don't quite understand this. If it's a self-join, and `left` and `right` is same plan(same plan id), then after `dedupRight`, `left` and `right` is not same plan but still have same plan id right? How do we resolve `UnresolvedAttribute` with plan id? I think it's still ambiguous.


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