XiangpengHao commented on code in PR #7850:
URL: https://github.com/apache/arrow-rs/pull/7850#discussion_r2180919509
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parquet/src/arrow/async_reader/mod.rs:
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@@ -613,8 +623,18 @@ where
.fetch(&mut self.input, predicate.projection(), selection)
.await?;
+ let mut cache_projection = predicate.projection().clone();
+ cache_projection.intersect(&projection);
Review Comment:
A column is cached if and only if it appears both in output projection and
filter projection
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