96dfaaecb1
- LATERAL JOIN: correlated subquery strategy (scan + merge + filter/sort/limit) - GROUP BY: SUM/AVG/MIN/MAX evaluation inside groups, HAVING filter - FILTER (WHERE ...): conditional aggregates for COUNT/SUM/AVG - ARRAY_AGG / STRING_AGG: multi-argument aggregate functions - GROUPING SETS / ROLLUP / CUBE: powerset generation for multi-level aggregation - PIVOT / UNPIVOT: row-to-column and column-to-row transformation - SQL/PGQ Property Graph: GRAPH_TABLE MATCH parser + executor skeleton - 330 tests passing, all 4 modalities (SQL/JSON/Vector/Graph) integrated