etseidl commented on code in PR #10784:
URL: https://github.com/apache/arrow-rs/pull/10784#discussion_r3832589699
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parquet/src/file/metadata/mod.rs:
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@@ -414,6 +414,167 @@ impl PageIndex {
}
}
+/// Builder for constructing [`PageIndex`] structures
+///
+/// It supports:
+/// - Allocating space for indexes based on [`PageIndexPolicy`]
+/// - Populating column indexes for predicate columns (for page filtering)
+/// - Populating offset indexes for projected columns (for direct I/O)
+/// - Automatic conversion of empty structures to `None` to save memory
+pub(crate) struct PageIndexBuilder {
Review Comment:
I wasn't sure if this should stay internal, or make it `pub`
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