jianxind opened a new pull request #7607:
URL: https://github.com/apache/arrow/pull/7607
1. Add AVX2/AVX512 build version of aggregate sum/mean function.
Use set_source_files_properties to append the SIMD build option.
Register the SIMD path at runtime by CPU feature.
Move the sum/mean implementation to header file thus SIMD version can
reuse.
Also rework the implementation based on bit_block_counter.
2. Introduce ARROW_USER_SIMD_LEVEL env for test scope.
ex "ARROW_USER_SIMD_LEVEL=sse4_2 make unittest" on a AVX2 capable
device.
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