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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/02/15 19:44:09 UTC

[GitHub] venkata91 opened a new pull request #23803: [SPARK-26894][SQL] Handle Alias as well in AggregateEstimation to propagate child stats

venkata91 opened a new pull request #23803: [SPARK-26894][SQL] Handle Alias as well in AggregateEstimation to propagate child stats
URL: https://github.com/apache/spark/pull/23803
 
 
   ## What changes were proposed in this pull request?
   
   Currently aliases are not handled in the Aggregate Estimation due to which stats are not getting propagated. This causes CBO join-reordering to not give optimal join plans. ProjectEstimation is already taking care of aliases, we need same logic for AggregateEstimation as well to properly propagate stats when CBO is enabled.
   
   ## How was this patch tested?
   
   This patch is manually tested using the query Q83 of TPCDS benchmark (scale 1000)
   

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