[pick](branch-4.0)[fix](inverted index) Make select_best_reader deterministic for multi-index columns #61596#61692
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yiguolei merged 2 commits intoapache:branch-4.0from Mar 25, 2026
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…-index columns (apache#61596) ### What problem does this PR solve? Issue Number: close #DORIS-24685 Related PR: N/A Problem Summary: When multiple inverted indexes with different analyzers exist on the same column, `select_best_reader()` returns the first matching candidate based on iteration order of `_reader_entries`. Since `_reader_entries` ordering depends on the rowset schema's index ordering, and different segments can have different orderings (e.g. after sequential `BUILD INDEX` operations), the same query selects different indexes for different segments, producing inconsistent results. Fix: Replace all order-dependent candidate selection in `select_for_text()`, `select_for_numeric()`, and `select_best_reader()` with deterministic selection by smallest `index_id` via `pick_preferred()` and `pick_smallest_index_id()` helpers. This ensures consistent index selection regardless of schema ordering across segments.
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What problem does this PR solve?
Issue Number: close #xxx
Related PR: #61596
Problem Summary:
Pick #61596 to branch-4.0.
When a column has multiple inverted indexes (e.g., different analyzers), select_best_reader could return different readers depending on std::unordered_map iteration order, causing non-deterministic behavior. This fix sorts candidate readers by index_id to ensure deterministic selection.
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