QuakeWang opened a new pull request, #9187:
URL: https://github.com/apache/paimon/pull/9187
### Purpose
Primary-key sorted-index scans previously located each data file by linearly
walking its source group. Repeating the lookup for every file made source
localization quadratic in the number of source files.
Build a file-name-to-source-location map alongside the existing offsets so
file-local readers use constant-time lookups while preserving row-count
validation.
### Tests
- `mvn -pl paimon-core -DwildcardSuites=none
-Dtest=PrimaryKeySortedIndexScanTest test`
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