feat(mysql): implement columnStats using INFORMATION_SCHEMA.STATISTICS#233
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feat(mysql): implement columnStats using INFORMATION_SCHEMA.STATISTICS#233samuelayanshina wants to merge 1 commit into
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Enable column cardinality statistics for the MySQL connector by querying INFORMATION_SCHEMA.STATISTICS, which provides index-based cardinality estimates without requiring additional permissions. - Add generateColumnStatisticsQuery() to KtxMysqlDialect - Add getColumnStatistics() and columnStats() to KtxMysqlScanConnector - Flip columnStats capability from false to true - Add MysqlStatsRow and KtxMysqlColumnStatisticsResult interfaces - Add tests for dialect query generation and connector stats retrieval - Update dialect conformance fixture for mysql
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The MySQL connector had columnStats disabled generateColumnStatisticsQuery returned null and the capability was set to false. This PR implements column cardinality statistics for MySQL, bringing it to parity with the Postgres connector.
What changed:
Why INFORMATION_SCHEMA.STATISTICS:
MySQL doesn't expose a pg_stats equivalent for all columns. INFORMATION_SCHEMA.STATISTICS provides reliable cardinality estimates for indexed columns without requiring extra permissions or prior ANALYZE TABLE calls, making it the most practical approach for MySQL 5.7+.