save-buffer commented on PR #12289:
URL: https://github.com/apache/arrow/pull/12289#issuecomment-1129537998

   Just to be clear, it's not the Bloom filter that's slow (the slow parts tend 
to be full outer joins, where Bloom filter is disabled). It seems to be related 
to residual filters being slow, in particular KeyEncoder::DecodeNulls 


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