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98 lines
2.4 KiB
Plaintext
98 lines
2.4 KiB
Plaintext
#
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# EXPLAIN FORMAT=JSON tests. These are tests developed for MariaDB.
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#
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--disable_warnings
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drop table if exists t0,t1;
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--enable_warnings
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create table t0(a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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explain format=json select * from t0;
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explain format=json select * from t0 where 1>2;
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explain format=json select * from t0 where a<3;
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--echo # Try a basic join
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create table t1 (a int, b int, filler char(32), key(a));
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insert into t1
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select
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a.a + b.a* 10 + c.a * 100,
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a.a + b.a* 10 + c.a * 100,
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'filler'
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from t0 a, t0 b, t0 c;
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explain format=json select * from t0,t1 where t1.a=t0.a;
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--echo # Try range and index_merge
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create table t2 (a1 int, a2 int, b1 int, b2 int, key(a1,a2), key(b1,b2));
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insert into t2 select a,a,a,a from t1;
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explain format=json select * from t2 where a1<5;
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explain format=json select * from t2 where a1=1 or b1=2;
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explain format=json select * from t2 where a1=1 or (b1=2 and b2=3);
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--echo # Try ref access on two key components
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explain format=json select * from t0,t2 where t2.b1=t0.a and t2.b2=4;
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drop table t1,t2;
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--echo #
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--echo # Try a UNION
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--echo #
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explain format=json select * from t0 A union select * from t0 B;
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explain format=json select * from t0 A union all select * from t0 B;
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--echo #
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--echo # Subqueries
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--echo #
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create table t1 (a int, b int);
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insert into t1 select a,a from t0;
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explain format=json select a, a > (select max(b) from t1 where t1.b=t0.a) from t0;
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explain format=json
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select * from t0 where
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a > (select max(b) from t1 where t1.b=t0.a) or a < 3 ;
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drop table t1;
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--echo #
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--echo # Join buffering
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--echo #
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create table t1 (a int, b int);
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insert into t1 select tbl1.a+10*tbl2.a, tbl1.a+10*tbl2.a from t0 tbl1, t0 tbl2;
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explain format=json
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select * from t1 tbl1, t1 tbl2 where tbl1.a=tbl2.a and tbl1.b < 3 and tbl2.b < 5;
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drop table t1;
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--echo #
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--echo # Single-table UPDATE/DELETE
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--echo #
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explain format=json delete from t0;
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explain format=json delete from t0 where 1 > 2;
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explain format=json delete from t0 where a < 3;
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explain format=json update t0 set a=3 where a in (2,3,4);
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--echo #
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--echo # A derived table
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--echo #
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create table t1 (a int, b int);
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insert into t1 select a,a from t0;
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explain format=json
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select * from (select a, count(*) as cnt from t1 group by a) as tbl
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where cnt>0;
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explain format=json
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select * from (select a, count(*) as cnt from t1 group by a) as tbl1, t1 as
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tbl2 where cnt=tbl2.a;
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drop table t0;
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