[GitHub] [spark] aokolnychyi opened a new pull request #26751: [SPARK-30107][SQL] Expose nested schema pruning to all V2 sources

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aokolnychyi opened a new pull request #26751: [SPARK-30107][SQL] Expose nested schema pruning to all V2 sources
URL: https://github.com/apache/spark/pull/26751
 
 
   ### What changes were proposed in this pull request?
   
   This PR exposes the existing logic for nested schema pruning to all sources, which is in line with the description of `SupportsPushDownRequiredColumns` .
   
   Right now, `SchemaPruning` (rule, not helper utility) is applied in the optimizer directly on certain instances of `Table` ignoring `SupportsPushDownRequiredColumns` that is part of `ScanBuilder`. I think it would be cleaner to perform schema pruning and filter push-down in one place. Therefore, this PR moves all the logic into `V2ScanRelationPushDown`.
   
   ### Why are the changes needed?
   
   This change allows all V2 data sources to benefit from nested column pruning (if they support it).
   
   ### Does this PR introduce any user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   This PR mostly relies on existing tests. On top, it adds one test to verify that top-level schema pruning works as well as one test for predicates with subqueries.
   
   

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