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--source include/have_debug.inc --echo # --echo # Bug #725050: print keyuse info when hash join is used --echo # create table t1 (a int, b int); insert into t1 values (2,2), (1,1); create table t2 (a int); insert into t2 values (2), (3); set session join_cache_level=3; SET @saved_dbug = @@SESSION.debug_dbug; set @@debug_dbug= 'd,opt'; explain select t1.b from t1,t2 where t1.b=t2.a; select t1.b from t1,t2 where t1.b=t2.a; set session join_cache_level=default; drop table t1,t2; SET debug_dbug= @saved_dbug;