optimize RowGroupIndexReader for single row group reads
#9226
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Dandandan
approved these changes
Jan 20, 2026
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@friendlymatthew do you have some performance results? |
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Which issue does this PR close?
RowGroupIndexReaderfor single row group reads #9180Rationale 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