add support for more MySQL aggregate functions and improve their handling. #1188
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I've made to improve the handling of aggregate functions in MySQL queries:
Added support for window functions:
Added a new generateWindowSpecification() method that creates window function specifications
Window specifications can include:
PARTITION BY clause
ORDER BY clause
Frame clause (ROWS or RANGE based)
Enhanced aggregate function handling:
Added tracking of whether a window function has been generated
Randomly decides whether to add a window specification to aggregate functions
Improved query generation:
Better handling of GROUP BY clauses when aggregates are present
Proper tracking of columns for grouping
Support for HAVING clauses with aggregate conditions
Example for generated queries now
Query with Both Aggregates and Window Functions
SELECT columnn1, COUNT(DISTINCT column2), GROUP_CONCAT(column3) OVER (PARTITION BY column4), MAX(column5) OVER (ORDER BY column6 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) FROM table1 GROUP BY column7, column8 HAVING SUM(column9) > 1000 ORDER BY column10 ASC LIMIT 20;