minni31 opened a new pull request, #12142:
URL: https://github.com/apache/gluten/pull/12142

   ## What changes were proposed in this pull request?
   
   Register `bitmap_construct_agg` as a supported aggregate expression in the 
Velox backend, allowing it to be executed natively instead of falling back to 
vanilla Spark.
   
   ### Changes:
   - Add `BITMAP_CONSTRUCT_AGG` constant to `ExpressionNames`
   - Register `Sig[BitmapConstructAgg]` in Spark 3.5, 4.0, and 4.1 shims
   - Add `bitmap_construct_agg` to C++ plan validator allowed aggregate list
   
   ## Why are the changes needed?
   
   `bitmap_construct_agg` is currently not routed to the native Velox engine, 
causing it to fall back to vanilla Spark execution. By registering it as a 
supported expression, queries using bitmap aggregation can benefit from Velox's 
native execution performance.
   
   ## How was this patch tested?
   
   - Built successfully for Spark 3.5 profile
   - Ran `GlutenBitmapExpressionsQuerySuite` — all 10 tests passed
   


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