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perf: Use bitmask to filter Parquet predicate-pushdown items #17993
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performance
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python
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Aug 1, 2024
coastalwhite
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coastalwhite
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ritchie46,
c-peters,
alexander-beedie,
MarcoGorelli,
reswqa and
orlp
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August 2, 2024 10:57
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #17993 +/- ##
==========================================
- Coverage 80.49% 80.39% -0.11%
==========================================
Files 1496 1496
Lines 196728 197480 +752
Branches 2817 2820 +3
==========================================
+ Hits 158360 158759 +399
- Misses 37847 38199 +352
- Partials 521 522 +1 ☔ View full report in Codecov by Sentry. |
ritchie46
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Aug 5, 2024
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performance
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This adds the
prefiltered
option toscan_parquet(parallel='...')
which first evaluates the predicates and then only reads the relevant rows. For large files with predicates that are clustered or biased towards selecting or not-selecting, this provides a significant speed-up.