kazuyukitanimura opened a new pull request #35156:
URL: https://github.com/apache/spark/pull/35156


   ### What changes were proposed in this pull request?
   This PR proposes to improve `DataSourceV2Strategy` to be able to push down 
boolean column filters. Currently boolean column filters do not get pushed down 
and may cause unnecessary IO.
   This is a follow up PR of the same change for (V1) `DataSourceStrategy`.
   
   
   ### Why are the changes needed?
   The following query does not push down the filter in the current 
implementation
   ```
   SELECT * FROM t WHERE boolean_field
   ```
   although the following query pushes down the filter as expected.
   ```
   SELECT * FROM t WHERE boolean_field = true
   ```
   This is because the Physical Planner (`DataSourceV2Strategy`) currently only 
pushes down limited expression patterns like`EqualTo`.
   It is fair for Spark SQL users to expect `boolean_field` performs the same 
as `boolean_field = true`.
   
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   
   ### How was this patch tested?
   Added unit tests


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