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| author | Sergey Petrunya <psergey@askmonty.org> | 2012-04-26 06:40:36 +0530 |
|---|---|---|
| committer | Sergey Petrunya <psergey@askmonty.org> | 2012-04-26 06:40:36 +0530 |
| commit | ca8aa3901c5596d8d393f0f0ded5ea7292ed01c8 (patch) | |
| tree | 146f11589edf6e64628ef3d8cee7baa0bd198ada /mysql-test/r/show_explain.result | |
| parent | 8c4fc9ba75db308ba60a2efefa7cf5aa6b9b6447 (diff) | |
| download | mariadb-git-ca8aa3901c5596d8d393f0f0ded5ea7292ed01c8.tar.gz | |
MWL#182: Explain running statements
- Code cleanup
Diffstat (limited to 'mysql-test/r/show_explain.result')
| -rw-r--r-- | mysql-test/r/show_explain.result | 58 |
1 files changed, 57 insertions, 1 deletions
diff --git a/mysql-test/r/show_explain.result b/mysql-test/r/show_explain.result index 6742c6eacfe..07ccab1419e 100644 --- a/mysql-test/r/show_explain.result +++ b/mysql-test/r/show_explain.result @@ -1,4 +1,4 @@ -drop table if exists t0, t1; +drop table if exists t0, t1, t2; create table t0 (a int); insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1 (a int); @@ -125,4 +125,60 @@ id select_type table type possible_keys key key_len ref rows Extra 2 DEPENDENT SUBQUERY b ALL NULL NULL NULL NULL 10 Using where a (select max(a) from t0 b where b.a+a.a<10) 0 9 +# Try to do SHOW EXPLAIN for a query that runs a SET command: +# I've found experimentally that select_id==2 here... +# +set @show_explain_probe_select_id=2; +set debug='d,show_explain_probe_1'; +set @foo= (select max(a) from t0 where sin(a) >0); +show explain for $thr2; +ERROR HY000: Error when executing command SHOW EXPLAIN: Target is not running EXPLAINable command +# +# Attempt SHOW EXPLAIN for an UPDATE +# +create table t2 as select a as a, a as dummy from t0 limit 2; +set @show_explain_probe_select_id=2; +set debug='d,show_explain_probe_1'; +update t2 set dummy=0 where (select max(a) from t0 where t2.a + t0.a <3) >3 ; +show explain for $thr2; +ERROR HY000: Error when executing command SHOW EXPLAIN: Target is not running EXPLAINable command +show explain for $thr2; +ERROR HY000: Error when executing command SHOW EXPLAIN: Target is not running EXPLAINable command +drop table t2; +# +# Attempt SHOW EXPLAIN for a DELETE +# +create table t2 as select a as a, a as dummy from t0 limit 2; +set @show_explain_probe_select_id=2; +set debug='d,show_explain_probe_1'; +delete from t2 where (select max(a) from t0 where t2.a + t0.a <3) >3 ; +show explain for $thr2; +ERROR HY000: Error when executing command SHOW EXPLAIN: Target is not running EXPLAINable command +show explain for $thr2; +ERROR HY000: Error when executing command SHOW EXPLAIN: Target is not running EXPLAINable command +drop table t2; +# +# Multiple SHOW EXPLAIN calls for one select +# +create table t2 as select a as a, a as dummy from t0 limit 3; +set @show_explain_probe_select_id=2; +set debug='d,show_explain_probe_1'; +select t2.a, ((select max(a) from t0 where t2.a + t0.a <3) >3) as SUBQ from t2; +show explain for $thr2; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t2 ALL NULL NULL NULL NULL 3 +2 DEPENDENT SUBQUERY t0 ALL NULL NULL NULL NULL 10 Using where +show explain for $thr2; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t2 ALL NULL NULL NULL NULL 3 +2 DEPENDENT SUBQUERY t0 ALL NULL NULL NULL NULL 10 Using where +show explain for $thr2; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY t2 ALL NULL NULL NULL NULL 3 +2 DEPENDENT SUBQUERY t0 ALL NULL NULL NULL NULL 10 Using where +a SUBQ +0 0 +1 0 +2 0 +drop table t2; drop table t0,t1; |