hhhizzz commented on code in PR #10288:
URL: https://github.com/apache/arrow-rs/pull/10288#discussion_r3610658580
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parquet/src/arrow/arrow_reader/selection.rs:
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@@ -824,6 +818,54 @@ impl MaskCursor {
})
}
+ /// Returns the next mask chunk without crossing a row range that was not
loaded.
Review Comment:
I added a source-level diagram to `MaskCursor` showing a selection mask, two
projected columns with different page boundaries, the resulting
`LoadedRowRanges` intersection, and the skip/decode operations.
The example also explains that loaded ranges are decode boundaries rather
than output batch boundaries, and shows how the mask fragments are combined
before filtering.
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