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211 lines
6.1 KiB
Text
211 lines
6.1 KiB
Text
#
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# Tests for SHOW EXPLAIN FOR functionality
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#
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--source include/have_debug.inc
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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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#
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# Testcases in this file do not work with embedded server. The reason for this
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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_dbug='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_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_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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-- source include/not_embedded.inc
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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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create table t1 (a int);
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insert into t1 select A.a + 10*B.a + 100*C.a from t0 A, t0 B, t0 C;
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alter table t1 add b int, add c int, add filler char(32);
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update t1 set b=a, c=a, filler='fooo';
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alter table t1 add key(a), add key(b);
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#
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# Try killing a non-existent thread
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#
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--error ER_NO_SUCH_THREAD
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show explain for 2*1000*1000*1000;
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--error ER_NOT_SUPPORTED_YET
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show explain for (select max(a) from t0);
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#
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# Setup two threads and their ids
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#
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let $thr1=`select connection_id()`;
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connect (con1, localhost, root,,);
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connection con1;
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let $thr2=`select connection_id()`;
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connection default;
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# SHOW EXPLAIN FOR <idle thread>
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--error ER_ERROR_WHEN_EXECUTING_COMMAND
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evalp show explain for $thr2;
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# SHOW EXPLAIN FOR <ourselves>
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--error ER_ERROR_WHEN_EXECUTING_COMMAND
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evalp show explain for $thr1;
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let $wait_condition= select State='show_explain_trap' from information_schema.processlist where id=$thr2;
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#
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# Test SHOW EXPLAIN for simple queries
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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_dbug='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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--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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send select max(c) from t1 where a < 10;
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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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--echo # We can catch EXPLAIN, too.
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set @show_expl_tmp= @@optimizer_switch;
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set optimizer_switch='index_condition_pushdown=on,mrr=on,mrr_sort_keys=on';
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send explain select max(c) from t1 where a < 10;
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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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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_dbug='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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evalp show explain for $thr2;
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connection con1;
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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_dbug='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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evalp show explain for $thr2;
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connection con1;
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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_dbug='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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evalp show explain for $thr2;
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connection con1;
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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_dbug='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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evalp show explain for $thr2;
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connection con1;
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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_dbug='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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evalp show explain for $thr2;
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connection con1;
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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_dbug='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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evalp show explain for $thr2;
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connection con1;
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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_dbug='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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evalp show explain for $thr2;
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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=2;
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set debug_dbug='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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evalp show explain for $thr2;
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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_dbug='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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# TODO: hit JOIN::optimize for non-select commands: UPDATE/DELETE, SET.
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## TODO: Test this: multiple SHOW EXPLAIN calls in course of running of one select
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##
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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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