feat(dsql): enhance query plan explainability with type coercion detection and rewrite references#161
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…ction and rewrite references - Add structured trigger phrases and routing criteria for query plan diagnosis - Add type coercion index bypass detection (implicit cast compatibility matrix) - Extend catalog queries with indexed column type retrieval - Add generic SQL rewrite reference (11 patterns: OR-to-IN, subquery unnesting, etc.) - Add DSQL-specific rewrite reference (reltuples estimate, split large joins for DP threshold) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
plan-interpretation.mdcatalog-queries.mdwith indexed column type retrieval queriesquery-rewrites-generic.mdwith 11 general SQL rewrite patterns (OR-to-IN, LEFT-to-INNER JOIN, subquery unnesting variants, predicate pushdown, GROUP BY into subquery, etc.)query-rewrites-dsql-specific.mdwith 2 DSQL-specific rewrites (reltuples estimate, split large joins for DP threshold)Test plan
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