Dandandan commented on code in PR #9414:
URL: https://github.com/apache/arrow-rs/pull/9414#discussion_r2966107445
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parquet/src/arrow/arrow_reader/mod.rs:
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@@ -430,6 +434,32 @@ impl<T> ArrowReaderBuilder<T> {
..self
}
}
+
+ /// Set a scatter threshold for filter deferral.
Review Comment:
Yeah - I also think this is quite a bit better - I think it's OK if a filter
"only" selects 50% of the rows, if it is nicely packed that will probably be
able to skip almost 50% of the pages and lead to efficient IO and decoding.
But (especially when combining multiple filters), chances are the filter
gets too fragmented, a 50% packed one is better than a 25% selective one that
just does select 1 / skip 1 / select 1 ...
I think you could go even go further and check which combination of filtera
are giving the best of both worlds (selectivity and fragmentation)
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