haohuaijin commented on code in PR #9766:
URL: https://github.com/apache/arrow-rs/pull/9766#discussion_r3135455795
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parquet/src/arrow/arrow_reader/read_plan.rs:
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@@ -305,6 +385,35 @@ impl LimitedReadPlanBuilder {
}
}
+/// Produce a new `BooleanArray` of the same length as `filter` in which only
+/// the first `n` `true` positions from `filter` remain `true`; any `true`
+/// positions beyond the first `n` are replaced with `false`.
+///
+/// `filter` must not contain nulls (callers apply [`prep_null_mask_filter`]
+/// first). If `filter` has at most `n` `true` values, a clone is returned.
+fn truncate_filter_after_n_trues(filter: &BooleanArray, n: usize) ->
BooleanArray {
Review Comment:
create a issue to track https://github.com/apache/arrow-rs/issues/9803
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