[GitHub] [spark] anchovYu commented on pull request #39773: [SPARK-42217][SQL] Support implicit lateral column alias in queries with Window

["anchovYu (via GitHub)" <gi...@apache.org>]

anchovYu commented on PR #39773:
URL: https://github.com/apache/spark/pull/39773#issuecomment-1411595045

   @srielau Thanks for bringing up this concern. 
   LCA in this PR doesn't introduce nested Window, it is a feature already been supported by Spark. But LCA does make this pattern easier to access.
   
   I suggest to merge this PR first, but further iterate on if we want to control the default behavior using a config, or if we want to partially forbid it. I believe basic support in Window is still needed anyway, e.g. select 1 as a, a, ..(followed by some  regular window expression), which is enabled by this PR.


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