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Sergei Petrunia authored
MDEV-26337: subquery with groupby and ROLLUP returns incorrect results on LEFT JOIN on INDEXED values Disable LATERAL DERIVED optimization for subqueries that have WITH ROLLUP. This bug could affect queries with grouping derived tables / views / CTEs with ROLLUP. The bug could manifest itself if the corresponding materialized derived tables are subject to split optimization. The current implementation of the split optimization produces rows from the derived table in an arbitrary order. So these rows must be accumulated in another temporary table and sorted according to the used GROUP BY clause in order to be able to generate the additional ROLLUP rows. This patch prohibits to use split optimization for grouping derived tables / views / CTEs with ROLLUP.
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