LiaCastaneda opened a new pull request, #18404:
URL: https://github.com/apache/datafusion/pull/18404

   ## Which issue does this PR close?
   
   - Closes #18399
   
   ## Rationale for this change
   
   As of now, filters
   
   ## What changes are included in this PR?
   
   - Implemented `gather_filters_for_pushdown()` for `AggregateExec` that 
allows filters on grouping columns to pass through to children
   - Added safety check: only filters referencing grouping columns are pushed 
through; filters on aggregate results remain above the aggregate
   - Supports both Pre phase (static filters) and Post phase (dynamic filters 
from joins)
   
   ## Are these changes tested?
   
   Yes, added three tests:
   - `test_aggregate_filter_pushdown`: Positive case with aggregate functions
   - `test_no_pushdown_aggregate_filter_on_non_grouping_column`: Negative case 
ensuring filters on aggregate results are not pushed
   
   ## Are there any user-facing changes?
   
   <!--
   If there are user-facing changes then we may require documentation to be 
updated before approving the PR.
   -->
   
   <!--
   If there are any breaking changes to public APIs, please add the `api 
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