etseidl commented on code in PR #11157:
URL: https://github.com/apache/arrow-rs/pull/11157#discussion_r4146203784
##########
parquet/src/file/metadata/reader.rs:
##########
@@ -108,6 +117,191 @@ impl From<bool> for PageIndexPolicy {
}
}
+/// Struct to specify column chunks for which metadata is required.
+///
+/// Column chunks are identified by row group index and leaf column index (the
index of the
+/// column in [`SchemaDescriptor::columns`], not the index of a root or Arrow
field). This struct
+/// allows for specifying vertical slices of column chunk data (via
[`Self::columns`]),
+/// horizontal slices (via [`Self::row_groups`]), or the intersection of the
two
+/// (via [`Self::row_groups_and_columns`]).
+///
+/// At present this is only used to select elements of the [Page Index] for
decoding.
Review Comment:
While we're on cloning, if you have a moment to opine on #11297 I'd
appreciate your thoughts.
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