friendlymatthew opened a new pull request, #9226:
URL: https://github.com/apache/arrow-rs/pull/9226
# Which issue does this PR close?
- Closes #9180
# Rationale for this change
This PR adds a fast path that detects single row group reads at construction
time and stores the constant index value directly, avoiding Hashmap allocation
and iterator overhead
For multiple row groups, the existing iterator-based approach is used
unchanged
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