zeroshade opened a new pull request, #45093:
URL: https://github.com/apache/arrow/pull/45093
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### Rationale for this change
For some consumers, it is convenient to expose a way to retrieve the
necessary byte ranges of a parquet file to read specific column chunks from row
groups without having to go through a full `ReadRangeCache`. Ultimately, it's a
fairly simple function since we already have all the infrastructure implemented
to compute these ranges.
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### What changes are included in this PR?
A single function added to `parquet::FileReader` named `GetReadRanges` which
computes and retrieves the coalesced read ranges for specified row groups and
column indices.
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