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MDEV-13049 Querying INFORMATION_SCHEMA becomes slow in MariaDB 10.1
Optimizations: * avoid faster ext_table_discovery_simple() *only* when there are engines with discover_table_names() method *and* they look at file names. P_S implements discover_table_names(), but it's not a reason to use slower extension_based_table_discovery(). * don't pre-sort table names if ORDER BY or GROUP BY was specified * starting from 10.3 only sort table names for SHOW commands
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