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igor@olga.mysql.com authored
UNION over correlated and uncorrelated SELECTS. In such subqueries each uncorrelated SELECT should be considered as uncacheable. Otherwise join_free is called for it and in many cases it causes some problems.
3c814f22
UNION over correlated and uncorrelated SELECTS. In such subqueries each uncorrelated SELECT should be considered as uncacheable. Otherwise join_free is called for it and in many cases it causes some problems.