• Evgeny Potemkin's avatar
    Bug#50843: Filesort used instead of clustered index led to · cc01fc3f
    Evgeny Potemkin authored
    performance degradation.
    
    Filesort + join cache combination is preferred to full index scan because it
    is usually faster. But it's not the case when the index is clustered one.
    
    Now test_if_skip_sort_order function prefers filesort only if index isn't
    clustered.
    cc01fc3f
innodb_mysql.test 15 KB