Tushar7012 commented on PR #19975:
URL: https://github.com/apache/datafusion/pull/19975#issuecomment-3796992474

   Updated! Changed `view_idx: usize` to `builder_idx: u32` to reduce memory 
overhead.
   
   This saves 4 bytes per entry on 64-bit systems while still supporting up to 
4 billion distinct values - should be more than enough for practical use cases.
   
   Let me know if you'd like me to explore further optimizations or if this 
looks good!


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