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* feat(mysql): implement columnStats using INFORMATION_SCHEMA.STATISTICS 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 * fix(mysql): filter to leading index columns to avoid inflated cardinality Add AND SEQ_IN_INDEX = 1 to INFORMATION_SCHEMA.STATISTICS query to ensure only leading index columns are returned. For composite indexes, non-leading columns report the cardinality of the index prefix rather than the column's own distinct count, which inflates distinctCount. Add regression test asserting SEQ_IN_INDEX = 1 is present in the query. * fix: add trailing newline to dialect.test.ts --------- Co-authored-by: Andrey Avtomonov <andreybavt@gmail.com> |
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