mirror of
https://github.com/MariaDB/server.git
synced 2025-08-01 03:47:19 +03:00
Apply earlier patch: correct handling of subqueries that
were not yet optimized or already executed and deleted.
This commit is contained in:
Sergey Petrunya
@ -15,7 +15,7 @@ ERROR HY000: Error when executing command SHOW EXPLAIN: Target is not running EX
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show explain for $thr1;
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ERROR HY000: Error when executing command SHOW EXPLAIN: Target is not running EXPLAINable command
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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select count(*) from t1 where a < 100000;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -25,7 +25,7 @@ count(*)
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select max(c) from t1 where a < 10;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range a a 5 NULL 10 Using where
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1 SIMPLE t1 range a a 5 NULL 10 Using index condition
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max(c)
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9
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# We can catch EXPLAIN, too.
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@ -40,7 +40,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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set optimizer_switch= @show_expl_tmp;
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# UNION, first branch
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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explain select a from t0 A union select a+1 from t0 B;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -53,7 +53,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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# UNION, second branch
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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explain select a from t0 A union select a+1 from t0 B;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -66,7 +66,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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# Uncorrelated subquery, select
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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select a, (select max(a) from t0 B) from t0 A where a<1;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -76,7 +76,7 @@ a (select max(a) from t0 B)
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0 9
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# Uncorrelated subquery, explain
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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explain select a, (select max(a) from t0 B) from t0 A where a<1;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -87,7 +87,7 @@ id select_type table type possible_keys key key_len ref rows Extra
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2 SUBQUERY B ALL NULL NULL NULL NULL 10
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# correlated subquery, select
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -97,7 +97,7 @@ a (select max(a) from t0 b where b.a+a.a<10)
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0 9
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# correlated subquery, explain
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -107,7 +107,7 @@ a (select max(a) from t0 b where b.a+a.a<10)
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0 9
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# correlated subquery, select, while inside the subquery
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set @show_explain_probe_select_id=2;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -117,7 +117,7 @@ a (select max(a) from t0 b where b.a+a.a<10)
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0 9
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# correlated subquery, explain, while inside the subquery
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set @show_explain_probe_select_id=2;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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@ -125,4 +125,13 @@ id select_type table type possible_keys key key_len ref rows Extra
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2 DEPENDENT SUBQUERY b ALL NULL NULL NULL NULL 10 Using where
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a (select max(a) from t0 b where b.a+a.a<10)
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0 9
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# correlated subquery, explain, while inside the subquery
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_join_exec_end';
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select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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show explain for $thr2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Query plan already deleted
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a (select max(a) from t0 b where b.a+a.a<10)
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0 9
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drop table t0,t1;
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@ -12,17 +12,17 @@ drop table if exists t0, t1;
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# is that we use the following commands for synchronization:
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#
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# set @show_explain_probe_select_id=1;
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# set debug='d,show_explain_probe_1';
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# set debug='d,show_explain_probe_join_exec_start';
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# send select count(*) from t1 where a < 100000;
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#
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# When ran with mysqltest_embedded, this translates into:
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#
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# Thread1> DBUG_PUSH("d,show_explain_probe_1");
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# Thread1> DBUG_PUSH("d,show_explain_probe_join_exec_start");
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# Thread1> create another thread for doing "send ... reap"
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# Thread2> mysql_parse("select count(*) from t1 where a < 100000");
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#
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# That is, "select count(*) ..." is ran in a thread for which DBUG_PUSH(...)
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# has not been called. As a result, show_explain_probe_1 does not fire, and
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# has not been called. As a result, show_explain_probe_join_exec_start does not fire, and
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# "select count(*) ..." does not wait till its SHOW EXPLAIN command, and the
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# test fails.
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#
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@ -70,7 +70,7 @@ let $wait_condition= select State='show_explain_trap' from information_schema.pr
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#
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connection con1;
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send select count(*) from t1 where a < 100000;
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connection default;
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@ -102,7 +102,7 @@ set optimizer_switch= @show_expl_tmp;
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--echo # UNION, first branch
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send explain select a from t0 A union select a+1 from t0 B;
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connection default;
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--source include/wait_condition.inc
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@ -113,7 +113,7 @@ reap;
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--echo # UNION, second branch
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send explain select a from t0 A union select a+1 from t0 B;
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connection default;
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--source include/wait_condition.inc
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@ -124,7 +124,7 @@ reap;
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--echo # Uncorrelated subquery, select
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send select a, (select max(a) from t0 B) from t0 A where a<1;
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connection default;
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--source include/wait_condition.inc
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@ -135,7 +135,7 @@ reap;
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--echo # Uncorrelated subquery, explain
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send explain select a, (select max(a) from t0 B) from t0 A where a<1;
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connection default;
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--source include/wait_condition.inc
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@ -145,7 +145,7 @@ reap;
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--echo # correlated subquery, select
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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connection default;
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--source include/wait_condition.inc
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@ -155,7 +155,7 @@ reap;
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--echo # correlated subquery, explain
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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connection default;
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--source include/wait_condition.inc
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@ -165,7 +165,7 @@ reap;
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--echo # correlated subquery, select, while inside the subquery
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set @show_explain_probe_select_id=2; # <---
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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connection default;
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--source include/wait_condition.inc
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@ -175,7 +175,7 @@ reap;
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--echo # correlated subquery, explain, while inside the subquery
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set @show_explain_probe_select_id=2;
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set debug='d,show_explain_probe_1';
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set debug='d,show_explain_probe_join_exec_start';
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send select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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connection default;
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--source include/wait_condition.inc
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@ -184,6 +184,16 @@ connection con1;
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reap;
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--echo # correlated subquery, explain, while inside the subquery
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set @show_explain_probe_select_id=1;
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set debug='d,show_explain_probe_join_exec_end';
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send select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
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connection default;
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--source include/wait_condition.inc
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evalp show explain for $thr2;
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connection con1;
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reap;
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# TODO: explain in the parent subuqery when the un-correlated child has been
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# run (and have done irreversible cleanups)
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@ -195,4 +205,7 @@ reap;
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## TODO: Test this: have several SHOW EXPLAIN requests be queued up for a
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## thread and served together.
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## TODO: SHOW EXPLAIN while the primary query is running EXPLAIN EXTENDED/PARTITIONS
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##
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drop table t0,t1;
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@ -3555,16 +3555,11 @@ void st_select_lex::set_explain_type(bool on_the_fly)
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using_materialization= TRUE;
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}
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if (this == master_unit()->fake_select_lex)
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type= "UNION RESULT";
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if (&master_unit()->thd->lex->select_lex == this)
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{
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type= is_primary ? "PRIMARY" : "SIMPLE";
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}
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if (!on_the_fly)
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// else
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else
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{
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if (this == first)
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{
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@ -3594,9 +3589,14 @@ void st_select_lex::set_explain_type(bool on_the_fly)
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else
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{
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type= is_uncacheable ? "UNCACHEABLE UNION": "UNION";
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if (this == master_unit()->fake_select_lex)
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type= "UNION RESULT";
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}
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}
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}
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if (!on_the_fly)
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options|= SELECT_DESCRIBE;
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}
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@ -3744,10 +3744,17 @@ bool st_select_lex::is_merged_child_of(st_select_lex *ancestor)
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}
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int print_explain_message_line(select_result_sink *result,
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SELECT_LEX *select_lex,
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bool on_the_fly,
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uint8 options,
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const char *message);
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int st_select_lex::print_explain(select_result_sink *output)
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{
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int res;
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if (join && join->optimized == 2)
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if (join && join->have_query_plan == JOIN::QEP_AVAILABLE)
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{
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res= join->print_explain(output, TRUE,
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FALSE, // need_tmp_table,
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@ -3773,13 +3780,18 @@ int st_select_lex::print_explain(select_result_sink *output)
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}
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else
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{
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/* Produce "not yet optimized" line */
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const char *msg="Not yet optimized";
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res= join->print_explain(output, TRUE,
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FALSE, // need_tmp_table,
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FALSE, // bool need_order,
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FALSE, // bool distinct,
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msg); //const char *message
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const char *msg;
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if (!join)
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DBUG_ASSERT(0); // psergey: TODO: can this happen or not?
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if (join->have_query_plan == JOIN::QEP_NOT_PRESENT_YET)
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msg= "Not yet optimized";
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else
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{
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DBUG_ASSERT(join->have_query_plan == JOIN::QEP_DELETED);
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msg= "Query plan already deleted";
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}
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res= print_explain_message_line(output, this, TRUE /* on_the_fly */,
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0, msg);
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}
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err:
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return 0;
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@ -931,7 +931,8 @@ err:
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int JOIN::optimize()
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{
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int res= optimize_inner();
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optimized= 2;
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if (!res)
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have_query_plan= QEP_AVAILABLE;
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return res;
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}
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/**
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@ -2104,7 +2105,22 @@ void JOIN::exec()
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Enable SHOW EXPLAIN only if we're in the top-level query.
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*/
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thd->apc_target.enable();
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DBUG_EXECUTE_IF("show_explain_probe_join_exec_start",
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if (dbug_user_var_equals_int(thd,
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"show_explain_probe_select_id",
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select_lex->select_number))
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dbug_serve_apcs(thd, 1);
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);
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exec_inner();
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DBUG_EXECUTE_IF("show_explain_probe_join_exec_end",
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if (dbug_user_var_equals_int(thd,
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"show_explain_probe_select_id",
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select_lex->select_number))
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dbug_serve_apcs(thd, 1);
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);
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thd->apc_target.disable();
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}
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@ -2127,13 +2143,6 @@ void JOIN::exec_inner()
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int tmp_error;
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DBUG_ENTER("JOIN::exec");
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DBUG_EXECUTE_IF("show_explain_probe_1",
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if (dbug_user_var_equals_int(thd,
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"show_explain_probe_select_id",
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select_lex->select_number))
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dbug_serve_apcs(thd, 1);
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);
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thd_proc_info(thd, "executing");
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error= 0;
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if (procedure)
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@ -2421,9 +2430,17 @@ void JOIN::exec_inner()
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DBUG_PRINT("info",("Creating group table"));
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/* Free first data from old join */
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fprintf(stderr,"Q: %s\n", thd->query());
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//DBUG_ASSERT(0);
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/*
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psergey-todo: this is the place of pre-mature JOIN::free call.
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*/
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curr_join->join_free();
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//psergey-todo: SHOW EXPLAIN probe here
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if (curr_join->make_simple_join(this, curr_tmp_table))
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DBUG_VOID_RETURN;
|
||||
//psergey-todo: SHOW EXPLAIN probe here
|
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calc_group_buffer(curr_join, group_list);
|
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count_field_types(select_lex, &curr_join->tmp_table_param,
|
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curr_join->tmp_all_fields1,
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@ -2544,7 +2561,9 @@ void JOIN::exec_inner()
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if (curr_tmp_table->distinct)
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curr_join->select_distinct=0; /* Each row is unique */
|
||||
|
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//psergey-todo: SHOW EXPLAIN probe here
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curr_join->join_free(); /* Free quick selects */
|
||||
//psergey-todo: SHOW EXPLAIN probe here
|
||||
if (curr_join->select_distinct && ! curr_join->group_list)
|
||||
{
|
||||
thd_proc_info(thd, "Removing duplicates");
|
||||
@ -10114,6 +10133,7 @@ void JOIN::cleanup(bool full)
|
||||
DBUG_ENTER("JOIN::cleanup");
|
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DBUG_PRINT("enter", ("full %u", (uint) full));
|
||||
|
||||
have_query_plan= QEP_DELETED;
|
||||
if (table)
|
||||
{
|
||||
JOIN_TAB *tab;
|
||||
@ -20706,6 +20726,41 @@ void JOIN::clear()
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
Print an EXPLAIN line with all NULLs and given message in the 'Extra' column
|
||||
*/
|
||||
int print_explain_message_line(select_result_sink *result,
|
||||
SELECT_LEX *select_lex,
|
||||
bool on_the_fly,
|
||||
uint8 options,
|
||||
const char *message)
|
||||
{
|
||||
const CHARSET_INFO *cs= system_charset_info;
|
||||
Item *item_null= new Item_null();
|
||||
List<Item> item_list;
|
||||
|
||||
if (on_the_fly)
|
||||
select_lex->set_explain_type(on_the_fly);
|
||||
|
||||
item_list.push_back(new Item_int((int32)
|
||||
select_lex->select_number));
|
||||
item_list.push_back(new Item_string(select_lex->type,
|
||||
strlen(select_lex->type), cs));
|
||||
for (uint i=0 ; i < 7; i++)
|
||||
item_list.push_back(item_null);
|
||||
if (options & DESCRIBE_PARTITIONS)
|
||||
item_list.push_back(item_null);
|
||||
if (options & DESCRIBE_EXTENDED)
|
||||
item_list.push_back(item_null);
|
||||
|
||||
item_list.push_back(new Item_string(message,strlen(message),cs));
|
||||
|
||||
if (result->send_data(item_list))
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int print_fake_select_lex_join(select_result_sink *result, bool on_the_fly,
|
||||
SELECT_LEX *select_lex, uint8 select_options)
|
||||
{
|
||||
@ -20810,7 +20865,7 @@ int JOIN::print_explain(select_result_sink *result, bool on_the_fly,
|
||||
DBUG_PRINT("info", ("Select 0x%lx, type %s, message %s",
|
||||
(ulong)join->select_lex, join->select_lex->type,
|
||||
message ? message : "NULL"));
|
||||
DBUG_ASSERT(this->optimized == 2);
|
||||
DBUG_ASSERT(this->have_query_plan == QEP_AVAILABLE);
|
||||
/* Don't log this into the slow query log */
|
||||
|
||||
if (!on_the_fly)
|
||||
@ -20825,7 +20880,9 @@ int JOIN::print_explain(select_result_sink *result, bool on_the_fly,
|
||||
*/
|
||||
if (message)
|
||||
{
|
||||
item_list.push_back(new Item_int((int32)
|
||||
// join->thd->lex->describe <- as options
|
||||
#if 0
|
||||
item_list.push_bace(new Item_int((int32)
|
||||
join->select_lex->select_number));
|
||||
item_list.push_back(new Item_string(join->select_lex->type,
|
||||
strlen(join->select_lex->type), cs));
|
||||
@ -20839,9 +20896,16 @@ int JOIN::print_explain(select_result_sink *result, bool on_the_fly,
|
||||
item_list.push_back(new Item_string(message,strlen(message),cs));
|
||||
if (result->send_data(item_list))
|
||||
error= 1;
|
||||
#endif
|
||||
//psergey-todo: is passing join->thd->lex->describe correct for SHOW EXPLAIN?
|
||||
if (print_explain_message_line(result, join->select_lex, on_the_fly,
|
||||
join->thd->lex->describe, message))
|
||||
error= 1;
|
||||
|
||||
}
|
||||
else if (join->select_lex == join->unit->fake_select_lex)
|
||||
{
|
||||
//psergey-todo: is passing join->thd->lex->describe correct for SHOW EXPLAIN?
|
||||
if (print_fake_select_lex_join(result, on_the_fly,
|
||||
join->select_lex,
|
||||
join->thd->lex->describe))
|
||||
@ -20853,7 +20917,7 @@ int JOIN::print_explain(select_result_sink *result, bool on_the_fly,
|
||||
table_map used_tables=0;
|
||||
//if (!join->select_lex->type)
|
||||
if (on_the_fly)
|
||||
join->select_lex->set_explain_type(on_the_fly); //psergey-todo: this adds SELECT_DESCRIBE to options! bad for on-the-fly
|
||||
join->select_lex->set_explain_type(on_the_fly);
|
||||
|
||||
bool printing_materialize_nest= FALSE;
|
||||
uint select_id= join->select_lex->select_number;
|
||||
|
||||
@ -1137,9 +1137,11 @@ public:
|
||||
const char *zero_result_cause; ///< not 0 if exec must return zero result
|
||||
|
||||
bool union_part; ///< this subselect is part of union
|
||||
int optimized; ///< flag to avoid double optimization in EXPLAIN
|
||||
bool optimized; ///< flag to avoid double optimization in EXPLAIN
|
||||
bool initialized; ///< flag to avoid double init_execution calls
|
||||
|
||||
enum { QEP_NOT_PRESENT_YET, QEP_AVAILABLE, QEP_DELETED} have_query_plan;
|
||||
|
||||
/*
|
||||
Additional WHERE and HAVING predicates to be considered for IN=>EXISTS
|
||||
subquery transformation of a JOIN object.
|
||||
@ -1221,6 +1223,7 @@ public:
|
||||
ref_pointer_array_size= 0;
|
||||
zero_result_cause= 0;
|
||||
optimized= 0;
|
||||
have_query_plan= QEP_NOT_PRESENT_YET;
|
||||
initialized= 0;
|
||||
cond_equal= 0;
|
||||
having_equal= 0;
|
||||
|
||||
Reference in New Issue
Block a user