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833aa97cec
When a query containing a WITH clause is printed by EXPLAIN EXTENDED command there should not be any data expansion in the query specifications of the WITH elements of this WITH clause.
942 lines
32 KiB
Plaintext
942 lines
32 KiB
Plaintext
create table t1 (a int, b varchar(32));
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insert into t1 values
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(4,'aaaa' ), (7,'bb'), (1,'ccc'), (4,'dd');
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insert into t1 values
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(3,'eee'), (7,'bb'), (1,'fff'), (4,'ggg');
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create table t2 (c int);
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insert into t2 values
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(2), (4), (5), (3);
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# select certain field in the specification of t
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with t as (select a from t1 where b >= 'c')
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select * from t2,t where t2.c=t.a;
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c a
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4 4
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3 3
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4 4
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select * from t2, (select a from t1 where b >= 'c') as t
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where t2.c=t.a;
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c a
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4 4
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3 3
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4 4
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explain
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with t as (select a from t1 where b >= 'c')
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select * from t2,t where t2.c=t.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 4
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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explain
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select * from t2, (select a from t1 where b >= 'c') as t
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where t2.c=t.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 4
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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# select '*' in the specification of t
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with t as (select * from t1 where b >= 'c')
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select * from t2,t where t2.c=t.a;
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c a b
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4 4 dd
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3 3 eee
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4 4 ggg
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select * from t2, (select * from t1 where b >= 'c') as t
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where t2.c=t.a;
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c a b
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4 4 dd
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3 3 eee
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4 4 ggg
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explain
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with t as (select * from t1 where b >= 'c')
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select * from t2,t where t2.c=t.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 4
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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explain
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select * from t2, (select * from t1 where b >= 'c') as t
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where t2.c=t.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 4
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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# rename fields returned by the specication when defining t
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with t(f1,f2) as (select * from t1 where b >= 'c')
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select * from t2,t where t2.c=t.f1;
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c f1 f2
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4 4 dd
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3 3 eee
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4 4 ggg
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explain
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with t(f1,f2) as (select * from t1 where b >= 'c')
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select * from t2,t where t2.c=t.f1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 4
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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# materialized query specifying t
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with t as (select a, count(*) from t1 where b >= 'c' group by a)
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select * from t2,t where t2.c=t.a;
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c a count(*)
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4 4 2
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3 3 1
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select * from t2, (select a, count(*) from t1 where b >= 'c' group by a) as t
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where t2.c=t.a;
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c a count(*)
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4 4 2
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3 3 1
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explain
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with t as (select a, count(*) from t1 where b >= 'c' group by a)
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select * from t2,t where t2.c=t.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
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1 PRIMARY <derived2> ref key0 key0 5 test.t2.c 2
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2 SUBQUERY t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary; Using filesort
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explain
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select * from t2, (select a, count(*) from t1 where b >= 'c' group by a) as t
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where t2.c=t.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
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1 PRIMARY <derived2> ref key0 key0 5 test.t2.c 2
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2 DERIVED t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary; Using filesort
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# specivication of t contains having
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with t as (select a, count(*) from t1 where b >= 'c'
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group by a having count(*)=1 )
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select * from t2,t where t2.c=t.a;
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c a count(*)
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3 3 1
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select * from t2, (select a, count(*) from t1 where b >= 'c'
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group by a having count(*)=1) t
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where t2.c=t.a;
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c a count(*)
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3 3 1
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# main query contains having
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with t as (select * from t2 where c <= 4)
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select a, count(*) from t1,t where t1.a=t.c group by a having count(*)=1;
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a count(*)
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3 1
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select a, count(*) from t1, (select * from t2 where c <= 4) t
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where t1.a=t.c group by a having count(*)=1;
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a count(*)
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3 1
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# main query contains group by + order by
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with t as (select * from t2 where c <= 4 )
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select a, count(*) from t1,t where t1.a=t.c group by a order by count(*);
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a count(*)
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3 1
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4 3
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select a, count(*) from t1, (select * from t2 where c <= 4 ) t
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where t1.a=t.c group by a order by count(*);
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a count(*)
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3 1
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4 3
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# main query contains group by + order by + limit
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with t as (select * from t2 where c <= 4 )
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select a, count(*) from t1,t
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where t1.a=t.c group by a order by count(*) desc limit 1;
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a count(*)
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4 3
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select a, count(*) from t1, (select * from t2 where c <= 4 ) t
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where t1.a=t.c group by a order by count(*) desc limit 1;
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a count(*)
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4 3
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# t is used in a subquery
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with t as (select a from t1 where a<5)
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select * from t2 where c in (select a from t);
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c
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4
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3
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select * from t2
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where c in (select a from (select a from t1 where a<5) as t);
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c
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4
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3
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explain
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with t as (select a from t1 where a<5)
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select * from t2 where c in (select a from t);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4
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1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1
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3 MATERIALIZED t1 ALL NULL NULL NULL NULL 8 Using where
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explain
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select * from t2
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where c in (select a from (select a from t1 where a<5) as t);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4
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1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
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2 MATERIALIZED t1 ALL NULL NULL NULL NULL 8 Using where
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# materialized t is used in a subquery
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with t as (select count(*) as c from t1 where b >= 'c' group by a)
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select * from t2 where c in (select c from t);
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c
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2
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select * from t2
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where c in (select c from (select count(*) as c from t1
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where b >= 'c' group by a) as t);
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c
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2
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explain
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with t as (select count(*) as c from t1 where b >= 'c' group by a)
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select * from t2 where c in (select c from t);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
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1 PRIMARY <derived2> ref key0 key0 8 test.t2.c 2 Using where; FirstMatch(t2)
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2 SUBQUERY t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary; Using filesort
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explain
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select * from t2
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where c in (select c from (select count(*) as c from t1
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where b >= 'c' group by a) as t);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
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1 PRIMARY <derived3> ref key0 key0 8 test.t2.c 2 Using where; FirstMatch(t2)
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3 DERIVED t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary; Using filesort
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# two references to t specified by a query
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# selecting a field: both in main query
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with t as (select a from t1 where b >= 'c')
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select * from t as r1, t as r2 where r1.a=r2.a;
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a a
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1 1
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1 1
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4 4
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4 4
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3 3
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1 1
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1 1
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4 4
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4 4
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select * from (select a from t1 where b >= 'c') as r1,
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(select a from t1 where b >= 'c') as r2
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where r1.a=r2.a;
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a a
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1 1
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1 1
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4 4
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4 4
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3 3
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1 1
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1 1
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4 4
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4 4
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explain
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with t as (select a from t1 where b >= 'c')
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select * from t as r1, t as r2 where r1.a=r2.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 8 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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explain
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select * from (select a from t1 where b >= 'c') as r1,
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(select a from t1 where b >= 'c') as r2
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where r1.a=r2.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 8 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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# two references to materialized t: both in main query
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with t as (select distinct a from t1 where b >= 'c')
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select * from t as r1, t as r2 where r1.a=r2.a;
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a a
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1 1
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4 4
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3 3
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select * from (select distinct a from t1 where b >= 'c') as r1,
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(select distinct a from t1 where b >= 'c') as r2
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where r1.a=r2.a;
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a a
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1 1
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4 4
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3 3
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explain
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with t as (select distinct a from t1 where b >= 'c')
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select * from t as r1, t as r2 where r1.a=r2.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 8 Using where
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1 PRIMARY <derived3> ref key0 key0 5 r1.a 2
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3 SUBQUERY t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary
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2 SUBQUERY t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary
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explain
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select * from (select distinct a from t1 where b >= 'c') as r1,
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(select distinct a from t1 where b >= 'c') as r2
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where r1.a=r2.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> ALL NULL NULL NULL NULL 8 Using where
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1 PRIMARY <derived3> ref key0 key0 5 r1.a 2
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3 DERIVED t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary
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2 DERIVED t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary
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# two references to t specified by a query
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# selecting all fields: both in main query
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with t as (select * from t1 where b >= 'c')
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select * from t as r1, t as r2 where r1.a=r2.a;
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a b a b
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1 ccc 1 ccc
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1 fff 1 ccc
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4 dd 4 dd
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4 ggg 4 dd
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3 eee 3 eee
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1 ccc 1 fff
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1 fff 1 fff
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4 dd 4 ggg
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4 ggg 4 ggg
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select * from (select * from t1 where b >= 'c') as r1,
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(select * from t1 where b >= 'c') as r2
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where r1.a=r2.a;
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a b a b
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1 ccc 1 ccc
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1 fff 1 ccc
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4 dd 4 dd
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4 ggg 4 dd
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3 eee 3 eee
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1 ccc 1 fff
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1 fff 1 fff
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4 dd 4 ggg
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4 ggg 4 ggg
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explain
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with t as (select * from t1 where b >= 'c')
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select * from t as r1, t as r2 where r1.a=r2.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 8 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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explain
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select * from (select * from t1 where b >= 'c') as r1,
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(select * from t1 where b >= 'c') as r2
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where r1.a=r2.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 8 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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# two references to t specifying explicitly column names
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with t(c) as (select a from t1 where b >= 'c')
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select * from t r1, t r2 where r1.c=r2.c;
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c c
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1 1
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1 1
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4 4
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4 4
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3 3
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1 1
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1 1
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4 4
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4 4
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# t two references of t used in different parts of a union
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with t as (select a from t1 where b >= 'c')
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select * from t where a < 2
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union
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select * from t where a >= 4;
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a
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1
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4
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select * from (select a from t1 where b >= 'c') as t
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where t.a < 2
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union
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select * from (select a from t1 where b >= 'c') as t
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where t.a >= 4;
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a
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1
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4
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explain
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with t as (select a from t1 where b >= 'c')
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select * from t where a < 2
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union
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select * from t where a >= 4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where
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3 UNION t1 ALL NULL NULL NULL NULL 8 Using where
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NULL UNION RESULT <union1,3> ALL NULL NULL NULL NULL NULL
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explain
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select * from (select a from t1 where b >= 'c') as t
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where t.a < 2
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union
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select * from (select a from t1 where b >= 'c') as t
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where t.a >= 4;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where
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3 UNION t1 ALL NULL NULL NULL NULL 8 Using where
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NULL UNION RESULT <union1,3> ALL NULL NULL NULL NULL NULL
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# specification of t contains union
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with t as (select a from t1 where b >= 'f'
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union
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select c as a from t2 where c < 4)
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select * from t2,t where t2.c=t.a;
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c a
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2 2
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4 4
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3 3
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select * from t2,
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(select a from t1 where b >= 'f'
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union
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select c as a from t2 where c < 4) as t
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where t2.c=t.a;
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c a
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2 2
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4 4
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3 3
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explain
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with t as (select a from t1 where b >= 'f'
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union
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select c as a from t2 where c < 4)
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select * from t2,t where t2.c=t.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
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1 PRIMARY <derived2> ref key0 key0 5 test.t2.c 2
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2 SUBQUERY t1 ALL NULL NULL NULL NULL 8 Using where
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3 UNION t2 ALL NULL NULL NULL NULL 4 Using where
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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explain
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select * from t2,
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(select a from t1 where b >= 'f'
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union
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select c as a from t2 where c < 4) as t
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where t2.c=t.a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
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1 PRIMARY <derived2> ref key0 key0 5 test.t2.c 2
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2 DERIVED t1 ALL NULL NULL NULL NULL 8 Using where
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3 UNION t2 ALL NULL NULL NULL NULL 4 Using where
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NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
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# t is defined in the with clause of a subquery
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select t1.a,t1.b from t1,t2
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where t1.a>t2.c and
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t2.c in (with t as (select * from t1 where t1.a<5)
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select t2.c from t2,t where t2.c=t.a);
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a b
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4 aaaa
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7 bb
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7 bb
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4 dd
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7 bb
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7 bb
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4 ggg
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select t1.a,t1.b from t1,t2
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where t1.a>t2.c and
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t2.c in (select t2.c
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from t2,(select * from t1 where t1.a<5) as t
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where t2.c=t.a);
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a b
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4 aaaa
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7 bb
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7 bb
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4 dd
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7 bb
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7 bb
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4 ggg
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explain
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select t1.a,t1.b from t1,t2
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where t1.a>t2.c and
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t2.c in (with t as (select * from t1 where t1.a<5)
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select t2.c from t2,t where t2.c=t.a);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4
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1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where
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2 MATERIALIZED t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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explain
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select t1.a,t1.b from t1,t2
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where t1.a>t2.c and
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t2.c in (select t2.c
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from t2,(select * from t1 where t1.a<5) as t
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where t2.c=t.a);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 4
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1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
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1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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2 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where
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2 MATERIALIZED t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
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# two different definitions of t: one in the with clause of the main query,
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# the other in the with clause of a subquery
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with t as (select c from t2 where c >= 4)
|
|
select t1.a,t1.b from t1,t
|
|
where t1.a=t.c and
|
|
t.c in (with t as (select * from t1 where t1.a<5)
|
|
select t2.c from t2,t where t2.c=t.a);
|
|
a b
|
|
4 aaaa
|
|
4 dd
|
|
4 ggg
|
|
select t1.a,t1.b from t1, (select c from t2 where c >= 4) as t
|
|
where t1.a=t.c and
|
|
t.c in (select t2.c from t2, (select * from t1 where t1.a<5) as t
|
|
where t2.c=t.a);
|
|
a b
|
|
4 aaaa
|
|
4 dd
|
|
4 ggg
|
|
explain
|
|
with t as (select c from t2 where c >= 4)
|
|
select t1.a,t1.b from t1,t
|
|
where t1.a=t.c and
|
|
t.c in (with t as (select * from t1 where t1.a<5)
|
|
select t2.c from t2,t where t2.c=t.a);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
|
|
1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where
|
|
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
explain
|
|
select t1.a,t1.b from t1, (select c from t2 where c >= 4) as t
|
|
where t1.a=t.c and
|
|
t.c in (select t2.c from t2, (select * from t1 where t1.a<5) as t
|
|
where t2.c=t.a);
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
|
|
1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where
|
|
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
# another with table tt is defined in the with clause of a subquery
|
|
# from the specification of t
|
|
with t as (select * from t1
|
|
where a>2 and
|
|
b in (with tt as (select * from t2 where t2.c<5)
|
|
select t1.b from t1,tt where t1.a=tt.c))
|
|
select t.a, count(*) from t1,t where t1.a=t.a group by t.a;
|
|
a count(*)
|
|
3 1
|
|
4 9
|
|
select t.a, count(*)
|
|
from t1,
|
|
(select * from t1
|
|
where a>2 and
|
|
b in (select t1.b
|
|
from t1,
|
|
(select * from t2 where t2.c<5) as tt
|
|
where t1.a=tt.c)) as t
|
|
where t1.a=t.a group by t.a;
|
|
a count(*)
|
|
3 1
|
|
4 9
|
|
explain
|
|
with t as (select * from t1
|
|
where a>2 and
|
|
b in (with tt as (select * from t2 where t2.c<5)
|
|
select t1.b from t1,tt where t1.a=tt.c))
|
|
select t.a, count(*) from t1,t where t1.a=t.a group by t.a;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary; Using filesort
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where
|
|
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
explain
|
|
select t.a, count(*)
|
|
from t1,
|
|
(select * from t1
|
|
where a>2 and
|
|
b in (select t1.b
|
|
from t1,
|
|
(select * from t2 where t2.c<5) as tt
|
|
where t1.a=tt.c)) as t
|
|
where t1.a=t.a group by t.a;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary; Using filesort
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
3 MATERIALIZED t2 ALL NULL NULL NULL NULL 4 Using where
|
|
3 MATERIALIZED t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
# with clause in the specification of a derived table
|
|
select *
|
|
from t1,
|
|
(with t as (select a from t1 where b >= 'c')
|
|
select * from t2,t where t2.c=t.a) as tt
|
|
where t1.b > 'f' and tt.a=t1.a;
|
|
a b c a
|
|
4 ggg 4 4
|
|
4 ggg 4 4
|
|
select *
|
|
from t1,
|
|
(select * from t2,
|
|
(select a from t1 where b >= 'c') as t
|
|
where t2.c=t.a) as tt
|
|
where t1.b > 'f' and tt.a=t1.a;
|
|
a b c a
|
|
4 ggg 4 4
|
|
4 ggg 4 4
|
|
explain
|
|
select *
|
|
from t1,
|
|
(with t as (select a from t1 where b >= 'c')
|
|
select * from t2,t where t2.c=t.a) as tt
|
|
where t1.b > 'f' and tt.a=t1.a;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 4
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (incremental, BNL join)
|
|
explain
|
|
select *
|
|
from t1,
|
|
(select * from t2,
|
|
(select a from t1 where b >= 'c') as t
|
|
where t2.c=t.a) as tt
|
|
where t1.b > 'f' and tt.a=t1.a;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 4
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (incremental, BNL join)
|
|
# with claused in the specification of a view
|
|
create view v1 as
|
|
with t as (select a from t1 where b >= 'c')
|
|
select * from t2,t where t2.c=t.a;
|
|
show create view v1;
|
|
View Create View character_set_client collation_connection
|
|
v1 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS with t as (select `t1`.`a` AS `a` from `t1` where `t1`.`b` >= 'c')select `t2`.`c` AS `c`,`t`.`a` AS `a` from (`t2` join `t`) where `t2`.`c` = `t`.`a` latin1 latin1_swedish_ci
|
|
select * from v1;
|
|
c a
|
|
4 4
|
|
3 3
|
|
4 4
|
|
explain
|
|
select * from v1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t2 ALL NULL NULL NULL NULL 4
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
# with claused in the specification of a materialized view
|
|
create view v2 as
|
|
with t as (select a, count(*) from t1 where b >= 'c' group by a)
|
|
select * from t2,t where t2.c=t.a;
|
|
show create view v2;
|
|
View Create View character_set_client collation_connection
|
|
v2 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS with t as (select `t1`.`a` AS `a`,count(0) AS `count(*)` from `t1` where `t1`.`b` >= 'c' group by `t1`.`a`)select `t2`.`c` AS `c`,`t`.`a` AS `a`,`t`.`count(*)` AS `count(*)` from (`t2` join `t`) where `t2`.`c` = `t`.`a` latin1 latin1_swedish_ci
|
|
select * from v2;
|
|
c a count(*)
|
|
4 4 2
|
|
3 3 1
|
|
explain
|
|
select * from v2;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where
|
|
1 PRIMARY <derived3> ref key0 key0 5 test.t2.c 2
|
|
3 SUBQUERY t1 ALL NULL NULL NULL NULL 8 Using where; Using temporary; Using filesort
|
|
# with clause in the specification of a view that whose definition
|
|
# table alias for a with table
|
|
create view v3 as
|
|
with t(c) as (select a from t1 where b >= 'c')
|
|
select * from t r1 where r1.c=4;
|
|
show create view v3;
|
|
View Create View character_set_client collation_connection
|
|
v3 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v3` AS with t as (select `t1`.`a` AS `c` from `t1` where `t1`.`b` >= 'c')select `r1`.`c` AS `c` from `t` `r1` where `r1`.`c` = 4 latin1 latin1_swedish_ci
|
|
select * from v3;
|
|
c
|
|
4
|
|
4
|
|
# with clause in the specification of a view that whose definition
|
|
# two table aliases for for the same with table
|
|
create view v4(c,d) as
|
|
with t(c) as (select a from t1 where b >= 'c')
|
|
select * from t r1, t r2 where r1.c=r2.c and r2.c=4;
|
|
show create view v4;
|
|
View Create View character_set_client collation_connection
|
|
v4 CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v4` AS with t as (select `t1`.`a` AS `c` from `t1` where `t1`.`b` >= 'c')select `r1`.`c` AS `c`,`r2`.`c` AS `d` from (`t` `r1` join `t` `r2`) where `r1`.`c` = `r2`.`c` and `r2`.`c` = 4 latin1 latin1_swedish_ci
|
|
select * from v4;
|
|
c d
|
|
4 4
|
|
4 4
|
|
4 4
|
|
4 4
|
|
explain
|
|
select * from v4;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where
|
|
1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
drop view v1,v2,v3,v4;
|
|
# currently any views containing with clause are not updatable
|
|
create view v1(a) as
|
|
with t as (select a from t1 where b >= 'c')
|
|
select t.a from t2,t where t2.c=t.a;
|
|
update v1 set a=0 where a > 4;
|
|
ERROR HY000: The target table v1 of the UPDATE is not updatable
|
|
drop view v1;
|
|
# prepare of a query containing a definition of a with table t
|
|
prepare stmt1 from "
|
|
with t as (select a from t1 where b >= 'c')
|
|
select * from t2,t where t2.c=t.a;
|
|
";
|
|
execute stmt1;
|
|
c a
|
|
4 4
|
|
3 3
|
|
4 4
|
|
execute stmt1;
|
|
c a
|
|
4 4
|
|
3 3
|
|
4 4
|
|
deallocate prepare stmt1;
|
|
# prepare of a query containing a definition of a materialized t
|
|
prepare stmt1 from "
|
|
with t as (select a, count(*) from t1 where b >= 'c' group by a)
|
|
select * from t2,t where t2.c=t.a;
|
|
";
|
|
execute stmt1;
|
|
c a count(*)
|
|
4 4 2
|
|
3 3 1
|
|
execute stmt1;
|
|
c a count(*)
|
|
4 4 2
|
|
3 3 1
|
|
deallocate prepare stmt1;
|
|
# prepare of a query containing two references to with table t
|
|
prepare stmt1 from "
|
|
with t as (select * from t1 where b >= 'c')
|
|
select * from t as r1, t as r2 where r1.a=r2.a;
|
|
";
|
|
execute stmt1;
|
|
a b a b
|
|
1 ccc 1 ccc
|
|
1 fff 1 ccc
|
|
4 dd 4 dd
|
|
4 ggg 4 dd
|
|
3 eee 3 eee
|
|
1 ccc 1 fff
|
|
1 fff 1 fff
|
|
4 dd 4 ggg
|
|
4 ggg 4 ggg
|
|
execute stmt1;
|
|
a b a b
|
|
1 ccc 1 ccc
|
|
1 fff 1 ccc
|
|
4 dd 4 dd
|
|
4 ggg 4 dd
|
|
3 eee 3 eee
|
|
1 ccc 1 fff
|
|
1 fff 1 fff
|
|
4 dd 4 ggg
|
|
4 ggg 4 ggg
|
|
deallocate prepare stmt1;
|
|
with t(f) as (select * from t1 where b >= 'c')
|
|
select * from t2,t where t2.c=t.f1;
|
|
ERROR HY000: WITH column list and SELECT field list have different column counts
|
|
with t(f1,f1) as (select * from t1 where b >= 'c')
|
|
select * from t2,t where t2.c=t.f1;
|
|
ERROR 42S21: Duplicate column name 'f1'
|
|
with t as (select * from t2 where c>3),
|
|
t as (select a from t1 where a>2)
|
|
select * from t,t1 where t1.a=t.c;
|
|
ERROR HY000: Duplicate query name in WITH clause
|
|
with t as (select a from s where a<5),
|
|
s as (select a from t1 where b>='d')
|
|
select * from t,s where t.a=s.a;
|
|
ERROR 42S02: Table 'test.s' doesn't exist
|
|
with recursive
|
|
t as (select a from s where a<5),
|
|
s as (select a from t1 where b>='d')
|
|
select * from t,s where t.a=s.a;
|
|
a a
|
|
4 4
|
|
4 4
|
|
3 3
|
|
1 1
|
|
4 4
|
|
4 4
|
|
with recursive t as (select * from s where a>2),
|
|
s as (select a from t1,r where t1.a>r.c),
|
|
r as (select c from t,t2 where t.a=t2.c)
|
|
select * from r where r.c<7;
|
|
ERROR HY000: No anchors for recursive WITH element 't'
|
|
with recursive
|
|
t as (select * from s where a>2),
|
|
s as (select a from t1,r where t1.a>r.c),
|
|
r as (select c from t,t2 where t.a=t2.c)
|
|
select * from r where r.c<7;
|
|
ERROR HY000: No anchors for recursive WITH element 't'
|
|
with recursive
|
|
t as (select * from t1
|
|
where a in (select c from s where b<='ccc') and b>'b'),
|
|
s as (select * from t1,t2
|
|
where t1.a=t2.c and t1.c in (select a from t where a<5))
|
|
select * from s where s.b>'aaa';
|
|
ERROR HY000: No anchors for recursive WITH element 't'
|
|
with recursive
|
|
t as (select * from t1 where b>'aaa' and b <='d')
|
|
select t.b from t,t2
|
|
where t.a=t2.c and
|
|
t2.c in (with recursive
|
|
s as (select t1.a from s,t1 where t1.a=s.a and t1.b<'c')
|
|
select * from s);
|
|
ERROR HY000: No anchors for recursive WITH element 's'
|
|
#erroneous definition of unreferenced with table t
|
|
with t as (select count(*) from t1 where d>='f' group by a)
|
|
select t1.b from t2,t1 where t1.a = t2.c;
|
|
ERROR 42S22: Unknown column 'd' in 'where clause'
|
|
with t as (select count(*) from t1 where b>='f' group by a)
|
|
select t1.b from t2,t1 where t1.a = t2.c;
|
|
b
|
|
aaaa
|
|
dd
|
|
eee
|
|
ggg
|
|
#erroneous definition of s referring to unreferenced t
|
|
with t(d) as (select count(*) from t1 where b<='ccc' group by b),
|
|
s as (select * from t1 where a in (select t2.d from t2,t where t2.c=t.d))
|
|
select t1.b from t1,t2 where t1.a=t2.c;
|
|
ERROR 42S22: Unknown column 't2.d' in 'field list'
|
|
with t(d) as (select count(*) from t1 where b<='ccc' group by b),
|
|
s as (select * from t1 where a in (select t2.c from t2,t where t2.c=t.c))
|
|
select t1.b from t1,t2 where t1.a=t2.c;
|
|
ERROR 42S22: Unknown column 't.c' in 'where clause'
|
|
with t(d) as (select count(*) from t1 where b<='ccc' group by b),
|
|
s as (select * from t1 where a in (select t2.c from t2,t where t2.c=t.d))
|
|
select t1.b from t1,t2 where t1.a=t2.c;
|
|
b
|
|
aaaa
|
|
dd
|
|
eee
|
|
ggg
|
|
#erroneous definition of unreferenced with table t
|
|
with t(f) as (select * from t1 where b >= 'c')
|
|
select t1.b from t2,t1 where t1.a = t2.c;
|
|
ERROR HY000: WITH column list and SELECT field list have different column counts
|
|
#erroneous definition of unreferenced with table t
|
|
with t(f1,f1) as (select * from t1 where b >= 'c')
|
|
select t1.b from t2,t1 where t1.a = t2.c;
|
|
ERROR 42S21: Duplicate column name 'f1'
|
|
# explain for query with unreferenced with table
|
|
explain
|
|
with t as (select a from t1 where b >= 'c')
|
|
select t1.b from t2,t1 where t1.a = t2.c;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 4
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
explain
|
|
with t as (select a, count(*) from t1 where b >= 'c' group by a)
|
|
select t1.b from t2,t1 where t1.a = t2.c;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 4
|
|
1 PRIMARY t1 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
|
|
# too many with elements in with clause
|
|
with s65 as (select * from t1), s64 as (select * from t1) , s63 as (select * from t1) , s62 as (select * from t1) , s61 as (select * from t1) , s60 as (select * from t1) , s59 as (select * from t1) , s58 as (select * from t1) , s57 as (select * from t1) , s56 as (select * from t1) , s55 as (select * from t1) , s54 as (select * from t1) , s53 as (select * from t1) , s52 as (select * from t1) , s51 as (select * from t1) , s50 as (select * from t1) , s49 as (select * from t1) , s48 as (select * from t1) , s47 as (select * from t1) , s46 as (select * from t1) , s45 as (select * from t1) , s44 as (select * from t1) , s43 as (select * from t1) , s42 as (select * from t1) , s41 as (select * from t1) , s40 as (select * from t1) , s39 as (select * from t1) , s38 as (select * from t1) , s37 as (select * from t1) , s36 as (select * from t1) , s35 as (select * from t1) , s34 as (select * from t1) , s33 as (select * from t1) , s32 as (select * from t1) , s31 as (select * from t1) , s30 as (select * from t1) , s29 as (select * from t1) , s28 as (select * from t1) , s27 as (select * from t1) , s26 as (select * from t1) , s25 as (select * from t1) , s24 as (select * from t1) , s23 as (select * from t1) , s22 as (select * from t1) , s21 as (select * from t1) , s20 as (select * from t1) , s19 as (select * from t1) , s18 as (select * from t1) , s17 as (select * from t1) , s16 as (select * from t1) , s15 as (select * from t1) , s14 as (select * from t1) , s13 as (select * from t1) , s12 as (select * from t1) , s11 as (select * from t1) , s10 as (select * from t1) , s9 as (select * from t1) , s8 as (select * from t1) , s7 as (select * from t1) , s6 as (select * from t1) , s5 as (select * from t1) , s4 as (select * from t1) , s3 as (select * from t1) , s2 as (select * from t1) , s1 as (select * from t1) select * from s65;
|
|
ERROR HY000: Too many WITH elements in WITH clause
|
|
drop table t1,t2;
|
|
#
|
|
# Bug mdev-9937: View used in the specification of with table
|
|
# refers to the base table with the same name
|
|
#
|
|
create table t1 (a int);
|
|
insert into t1 values (20), (30), (10);
|
|
create view v1 as select * from t1 where a > 10;
|
|
with t1 as (select * from v1) select * from t1;
|
|
a
|
|
20
|
|
30
|
|
drop view v1;
|
|
drop table t1;
|
|
#
|
|
# Bug mdev-10058: Invalid derived table with WITH clause
|
|
#
|
|
CREATE TABLE t1 (a INT);
|
|
CREATE TABLE t2 (a INT);
|
|
CREATE TABLE t3 (a INT);
|
|
INSERT INTO t1 VALUES (1),(2),(3);
|
|
INSERT INTO t2 VALUES (1),(2),(3);
|
|
INSERT INTO t3 VALUES (1),(2),(3);
|
|
SELECT * FROM (WITH a AS (SELECT * FROM t1) (t2 NATURAL JOIN t3));
|
|
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 't2 NATURAL JOIN t3))' at line 1
|
|
SELECT * FROM (WITH a AS (SELECT * FROM t1) SELECT * FROM t2 NATURAL JOIN t3) AS d1;
|
|
a
|
|
1
|
|
2
|
|
3
|
|
DROP TABLE t1,t2,t3;
|
|
#
|
|
# Bug mdev-10344: the WITH clause of the query refers to a view that uses
|
|
# a base table with the same name as a CTE table from the clause
|
|
#
|
|
create table ten(a int primary key);
|
|
insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
|
create table one_k(a int primary key);
|
|
insert into one_k select A.a + B.a* 10 + C.a * 100 from ten A, ten B, ten C;
|
|
create view v1 as select * from ten;
|
|
select * from v1;
|
|
a
|
|
0
|
|
1
|
|
2
|
|
3
|
|
4
|
|
5
|
|
6
|
|
7
|
|
8
|
|
9
|
|
drop view v1;
|
|
drop table ten, one_k;
|
|
#
|
|
# MDEV-10057 : Crash with EXPLAIN + WITH + constant query
|
|
#
|
|
CREATE TABLE t1 (a INT);
|
|
INSERT INTO t1 VALUES (1),(2),(3);
|
|
SELECT * FROM (WITH a AS (SELECT * FROM t1) SELECT 1) AS t1;
|
|
1
|
|
1
|
|
EXPLAIN SELECT * FROM (WITH a AS (SELECT * FROM t1) SELECT 1) AS t1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY <derived2> system NULL NULL NULL NULL 1
|
|
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
|
DROP TABLE t1;
|
|
#
|
|
# MDEV-10058: Suspicious EXPLAIN output for a derived table + WITH + joined table
|
|
#
|
|
CREATE TABLE t1 (a INT);
|
|
CREATE TABLE t2 (a INT);
|
|
CREATE TABLE t3 (a INT);
|
|
INSERT INTO t1 VALUES (1),(2),(3);
|
|
INSERT INTO t2 VALUES (1),(2),(3);
|
|
INSERT INTO t3 VALUES (1),(2),(3);
|
|
EXPLAIN SELECT * FROM (WITH a AS (SELECT * FROM t1) (t2 NATURAL JOIN t3));
|
|
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 't2 NATURAL JOIN t3))' at line 1
|
|
explain SELECT * FROM (WITH a AS (SELECT * FROM t1) SELECT * FROM t2 NATURAL JOIN t3) AS d1;
|
|
id select_type table type possible_keys key key_len ref rows Extra
|
|
1 PRIMARY t2 ALL NULL NULL NULL NULL 3
|
|
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
|
|
DROP TABLE t1,t2,t3;
|
|
#
|
|
# MDEV-10729: Server crashes in st_select_lex::set_explain_type
|
|
#
|
|
CREATE TABLE t1 (i1 INT, KEY(i1)) ENGINE=MyISAM;
|
|
INSERT INTO t1 VALUES (4),(8);
|
|
CREATE TABLE t2 (a2 INT, b2 INT, KEY(b2)) ENGINE=MyISAM;
|
|
INSERT INTO t2 VALUES (8,7);
|
|
CREATE TABLE t3 (i3 INT) ENGINE=MyISAM;
|
|
INSERT INTO t3 VALUES (2),(6);
|
|
SELECT * FROM t1, t2 WHERE a2 = i1 and b2 >= i1 AND i1 IN ( SELECT i3 FROM t3 )
|
|
UNION
|
|
SELECT * FROM t1, t2 WHERE a2 = i1 and b2 >= i1 AND i1 IN ( SELECT i3 FROM t3 )
|
|
;
|
|
i1 a2 b2
|
|
DROP TABLE t1,t2,t3;
|
|
#
|
|
# MDEV-10923: mergeable CTE used twice in the query
|
|
#
|
|
create table employees (
|
|
name varchar(32),
|
|
dept varchar(32),
|
|
country varchar(8)
|
|
);
|
|
insert into employees
|
|
values
|
|
('Sergei Golubchik', 'Development', 'DE'),
|
|
('Claudio Nanni', 'Support', 'ES'),
|
|
('Sergei Petrunia', 'Development', 'RU');
|
|
with eng as
|
|
(
|
|
select * from employees
|
|
where dept in ('Development','Support')
|
|
),
|
|
eu_eng as
|
|
(
|
|
select * from eng where country IN ('DE','ES','RU')
|
|
)
|
|
select * from eu_eng T1
|
|
where
|
|
not exists (select 1 from eu_eng T2
|
|
where T2.country=T1.country
|
|
and T2.name <> T1.name);
|
|
name dept country
|
|
Sergei Golubchik Development DE
|
|
Claudio Nanni Support ES
|
|
Sergei Petrunia Development RU
|
|
drop table employees;
|
|
#
|
|
# MDEV-11818: EXPLAIN EXTENDED for a query with optimized away CTE table
|
|
#
|
|
CREATE TABLE t1 (i INT, c VARCHAR(3));
|
|
INSERT INTO t1 VALUES (1,'foo');
|
|
EXPLAIN EXTENDED
|
|
WITH cte AS ( SELECT * FROM t1 ) SELECT i FROM cte;
|
|
id select_type table type possible_keys key key_len ref rows filtered Extra
|
|
1 SIMPLE t1 system NULL NULL NULL NULL 1 100.00
|
|
Warnings:
|
|
Note 1003 with cte as (select `test`.`t1`.`i` AS `i`,`test`.`t1`.`c` AS `c` from `test`.`t1`)select 1 AS `i` from dual
|
|
DROP TABLE t1;
|