[GitHub] mgaido91 commented on issue #23802: [SPARK-26893][SQL] Allow partition pruning with subquery filters on file source

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mgaido91 commented on issue #23802: [SPARK-26893][SQL] Allow partition pruning with subquery filters on file source
URL: https://github.com/apache/spark/pull/23802#issuecomment-464729445
 
 
   > if subquery filter can be a partition filter, why can't it be a data filter?
   
   the point is: when it is a partition filter it is present only once in the plan, while if it is a dataFilter it is present both in the FileScanExec and in the Filter (which cannot be removed in this case because we cannot enforce that the data source performs properly the filtering according to the dataFilters).

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