sdf-jkl commented on PR #9118:
URL: https://github.com/apache/arrow-rs/pull/9118#issuecomment-3825722402

   **So, the test cases we need for the new issue are:**
   - manually created selectors that skip a page and mask-based materialized. 
No filters needed. Final projection with multiple columns with different page 
layouts.
   - Filters create an RLE selection first, that later becomes mask-based. try 
different cols with different page layouts for applying mask-based selection. 
The final projection can be one col (other than predicate ones) to make this 
test more focused. `ArrowPredicates` with multiple columns in projection would 
be great.
   - An end-to-end test that tests both different col predicates and different 
col final projection.


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