alamb commented on code in PR #9118:
URL: https://github.com/apache/arrow-rs/pull/9118#discussion_r2743767602
##########
parquet/src/arrow/push_decoder/reader_builder/mod.rs:
##########
@@ -588,6 +591,24 @@ impl RowGroupReaderBuilder {
&mut self.buffers,
)?;
+ // For mask-based selection, attach offset index metadata for
page-aware chunking.
+ let offset_index_metadata = if
plan_builder.resolve_selection_strategy()
+ == RowSelectionStrategy::Mask
+ && plan_builder.selection().is_some_and(|selection| {
+ selection.requires_page_aware_mask(
+ &self.projection,
+ self.row_group_offset_index(row_group_idx),
+ )
+ }) {
+ self.row_group_offset_index(row_group_idx)
+ .map(|columns| columns.to_vec().into())
+ } else {
+ None
+ };
+
+ let plan_builder = plan_builder
+ .with_offset_index_metadata(offset_index_metadata,
&self.projection);
Review Comment:
I am still struggling to make adequate test covearage. I am rethinking the
approach
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