etseidl commented on code in PR #10784:
URL: https://github.com/apache/arrow-rs/pull/10784#discussion_r3836326347
##########
parquet/src/file/metadata/mod.rs:
##########
@@ -412,6 +412,176 @@ impl PageIndex {
None
}
}
+
+ /// Convert this `PageIndex` into a [`PageIndexBuilder`]
+ pub fn into_builder(self) -> PageIndexBuilder {
+ self.into()
+ }
+}
+
+/// 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 struct PageIndexBuilder {
+ column_indexes: Option<Vec<Vec<Option<ColumnIndexMetaData>>>>,
+ offset_indexes: Option<Vec<Vec<Option<OffsetIndexMetaData>>>>,
Review Comment:
I'd be interested in what you came up with. Ultimately I think we'd want to
reproduce a sparse representation throughout the metadata (row groups, column
chunks). Baby steps...
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