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Posted to github@arrow.apache.org by "XiangpengHao (via GitHub)" <gi...@apache.org> on 2025/07/02 20:30:56 UTC

Re: [PR] Parquet filter pushdown v4 [arrow-rs]

XiangpengHao commented on code in PR #7850:
URL: https://github.com/apache/arrow-rs/pull/7850#discussion_r2180919509


##########
parquet/src/arrow/async_reader/mod.rs:
##########
@@ -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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