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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2021/11/16 04:00:05 UTC

[GitHub] [spark] beliefer commented on pull request #34554: [SPARK-37286][SQL] Move compileFilter and compileAggregates from JDBCRDD to JdbcDialect

beliefer commented on pull request #34554:
URL: https://github.com/apache/spark/pull/34554#issuecomment-969835723


   Now Spark’s pushdown is that as long as there is a function that can’t be pushed down, it won’t be pushed down at all.
   On the other hand, spark does not need to implement partial pushdown, because the additional group by caused also has a lot of overhead.


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