… ask for a rows with little more complicated query, it confuses me even more: mysql> explain select c from test_idx where… index Join type “range”, but I know that MySQL uses it for IN queries even if it is not actually range, so… and Percona Server 5.5 5.1.54-rel12.5-log Percona Server with XtraDB (GPL), Release 12.5, Revision 188…
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