Github user viirya commented on the issue:
https://github.com/apache/spark/pull/13701
@yhuai I've run the test to check if row groups are actually filtered. I
manually print the number of blocks retrieved in
`SpecificParquetRecordReaderBase`. I set the block size to 1024 and rerun the
benchmark above. Without this patch, the number of blocks is 8063. After this
patch, the blocks is filtered and the number blocks is 0. So we can make sure
that the row groups are actually filtered now.
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