Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/19240
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Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/19240#discussion_r139042816
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -2256,7 +2256,10 @@ object CleanupAliases extends
GitHub user tdas opened a pull request:
https://github.com/apache/spark/pull/19240
[SPARK-22018][SQL]Preserve top-level alias metadata when collapsing projects
## What changes were proposed in this pull request?
If there are two projects like as follows.
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