mariadb/mysql-test/t/analyze_stmt.test

#
#  Tests for "ANALYZE $statement" feature (PostgreSQL's analog is called EXPLAIN ANALYZE)
#
--disable_warnings
drop table if exists t0,t1,t2,t3;
--enable_warnings

create table t0 (a int) engine=myisam;
INSERT INTO t0 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table t1 (a int) engine=myisam;
INSERT INTO t1 select * from t0;

--echo # Try a few basic selects to see that r_rows and r_filtered columns work
analyze select * from t1;
analyze select * from t1 where a<5;
analyze select * from t1 where a>100;

--echo # ANALYZE DELETE will delete rows:
analyze delete from t1 where a in (2,3,4);
select * from t1;
drop table t1;

--echo # ANALYZE UPDATE will make updates:
create table t1(a int, b int);
insert into t1 select a,a from t0;
analyze update t1 set b=100+b where a in (6,7,8);
select * from t1;
drop table t1;

--echo # Check that UNION works
create table t1(a int, b int);
insert into t1 select a,a from t0;
analyze (select * from t1 A where a<5) union (select * from t1 B where a in (5,6));
analyze (select * from t1 A where a<5) union (select * from t1 B where a in (1,2));
drop table t1;
drop table t0;

--echo # 
--echo # Try a subquery.
--echo # 
create table t0 (a int, b int);
insert into t0 values
  (0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);

create table t1 (a int, b int);
insert into t1 values (1,1),(2,2),(3,3);

#
#   t1      t0
#   a=1     (0,1)       2 rows
#   a=2     (0,1,2)     3 rows
#   a=3     (0,1,2,3)   4 rows
#
#  TOTAL    TOTAL= 9 rows.  3 executions, avg=3 rows.
#  WHERE is satisfied for 1 row per query, which gives filtered=33.3

--echo # See .test file for the right values of r_rows and r_filtered.
analyze select a, a in (select t0.b from t0 where t0.b+1=t1.b+1) from t1;

--echo # Try a subquery that is never executed
analyze select a, a in (select t0.b from t0 where t0.b+1=t1.b+1) from t1 where t1.a > 5;

drop table t0, t1;

--echo #
--echo # Tests for join buffering
--echo #
create table t0 (a int, b int);
insert into t0 values
  (0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9);
create table t1 like t0;
insert into t1 select * from t0;

explain select * from t0, t1 where t0.a<5 and t1.a<5;
--echo # These should have filtered=50
analyze select * from t0, t1 where t0.a<5 and t1.a<5;

explain select * from t0, t1 where t0.a<5 and t1.b=t0.b;
--echo # Now, t1 should have filtered=10
analyze select * from t0, t1 where t0.a<5 and t1.b=t0.b;

explain select * from t0, t1 where t0.a<5 and t1.a<5 and t1.b=t0.b;
--echo # Now, t1 should have filtered=10
analyze select * from t0, t1 where t0.a<5 and t1.a<5 and t1.b=t0.b;

--echo # TODO: Check what is counted for "range checked for each record".

--echo #
--echo # Test for joins
--echo #
create table t2 (key1 int, key2x int, col1 int, key(key1), key(key2x));
insert into t2 select A.a + 10 *B.a +100 * C.a, 
                      (A.a + 10 *B.a +100 * C.a)*2,
                      A.a + 10 *B.a +100 * C.a 
               from t0 A, t0 B, t0 C;

--echo # This always has matches, filtered=100%.
analyze select * from t1,t2 where t2.key1=t1.a;

--echo # This shows r_rows=0. It is actually 0.5 (should r_rows be changed to double?)
analyze select * from t1,t2 where t2.key2x=t1.a;
        select * from t1,t2 where t2.key2x=t1.a;

--echo # This has t2.filtered=40% (there are 5 values: {0,1,2,3,4}. two of them have mod=0)
analyze select * from t1,t2 where t2.key2x=t1.a and mod(t2.col1,4)=0;

drop table t0,t1,t2;