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c945233a19
The problem was caused by the following scenario: - range optimizer picks an index IDX1 which doesn't match the ORDER BY ... LIMIT clause. - test_if_skip_sort_order() decides to switch to index IDX2 which matches the ORDER BY ... LIMIT. - it runs SQL_SELECT::test_quick_select() for the second time to produce an quick select for IDX2. - However, test_quick_select() would figure that full index scan on IDX1 is still cheaper (its calculations ignore the LIMIT n). Fixed this by - passing force_quick_range=true to test_quick_select() - in test_quick_select, don't consider full index scans if the mentioned parameter is true. Numerous changes in .result files are caused by test_quick_select() being run after "early/late NULLs filtering" feature has injected NOT NULL condition.