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18 lines
610 B
Text
18 lines
610 B
Text
#
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# Bug #725050: print keyuse info when hash join is used
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#
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create table t1 (a int, b int);
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insert into t1 values (2,2), (1,1);
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create table t2 (a int);
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insert into t2 values (2), (3);
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set session join_cache_level=3;
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set @@debug_dbug= 'd,opt';
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explain select t1.b from t1,t2 where t1.b=t2.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
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1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t1.b 2 Using where; Using join buffer (flat, BNLH join)
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select t1.b from t1,t2 where t1.b=t2.a;
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b
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2
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set session join_cache_level=default;
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drop table t1,t2;
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