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538 lines
16 KiB
Text
538 lines
16 KiB
Text
#
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# Tests for SHOW EXPLAIN FORMAT=JSON FOR functionality.
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# FORMAT=JSON is essential here, tests for traditional SHOW EXPLAIN FOR
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# can be found at show_explain.test
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#
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--source include/have_debug.inc
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--source include/have_debug_sync.inc
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--source include/have_innodb.inc
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--source include/have_perfschema.inc
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# Using valgrind can cause 'reap' to fail. See comment below
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--source include/not_valgrind.inc
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--disable_warnings
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drop table if exists t0, t1, t2, t3, t4;
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drop view if exists v1;
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--enable_warnings
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SET @old_debug= @@session.debug_dbug;
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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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set debug_sync='RESET';
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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 to call SHOW EXPLAIN with a missing thread ID
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#
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--error ER_PARSE_ERROR
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show explain format=JSON for;
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#
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# Also test MySQL-compatible syntax EXPLAIN FOR CONNECTION which was introduced for MDEV-10000
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#
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--error ER_PARSE_ERROR
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explain format=JSON for connection;
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#
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# Try to call SHOW EXPLAIN/EXPLAIN FOR CONNECTION for a non-existent thread
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#
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--error ER_NO_SUCH_THREAD
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show explain FORMAT=json for 123456789;
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--error ER_NO_SUCH_THREAD
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explain FORMAT=json for connection 123456789;
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--error ER_SET_CONSTANTS_ONLY
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show explain FORMAT=json for (select max(a) from t0);
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--error ER_SET_CONSTANTS_ONLY
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explain FORMAT=json for connection (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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SET @old_debug= @@session.debug_dbug;
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connection default;
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# SHOW EXPLAIN FOR <idle thread>
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--error ER_TARGET_NOT_EXPLAINABLE
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evalp show explain format=JSON for $thr2;
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--error ER_TARGET_NOT_EXPLAINABLE
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evalp explain format=json for connection $thr2;
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# SHOW EXPLAIN FOR <ourselves>
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--error ER_TARGET_NOT_EXPLAINABLE
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evalp show explain format=json for $thr1;
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--error ER_TARGET_NOT_EXPLAINABLE
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evalp explain FORMAT=JSON for connection $thr1;
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# Not supported format of output
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--error ER_UNKNOWN_EXPLAIN_FORMAT
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evalp show explain FORMAT=HTML for $thr1;
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--error ER_UNKNOWN_EXPLAIN_FORMAT
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evalp explain FORMAT=XML for connection $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/EXPLAIN FOR CONNECTION 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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--source include/explain-no-costs.inc
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evalp show explain FORMAT=JSON 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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--source include/explain-no-costs.inc
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evalp explain FORMAT=JSON for connection $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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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $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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--source include/explain-no-costs.inc
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evalp show explain format=json for $thr2;
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connection con1;
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reap;
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--echo # Same for EXPLAIN FOR CONNECTION
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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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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $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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SET debug_dbug=@old_debug;
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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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--source include/explain-no-costs.inc
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evalp show explain format = JSON for $thr2;
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connection con1;
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reap;
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SET debug_dbug=@old_debug;
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--echo # UNION, second branch
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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 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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--source include/explain-no-costs.inc
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evalp show explain format=JSON for $thr2;
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connection con1;
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reap;
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SET debug_dbug=@old_debug;
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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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SET debug_dbug=@old_debug;
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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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SET debug_dbug=@old_debug;
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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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SET debug_dbug=@old_debug;
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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 explain 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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SET debug_dbug=@old_debug;
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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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--source include/explain-no-costs.inc
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evalp show explain format=JSON for $thr2;
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connection con1;
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reap;
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SET debug_dbug=@old_debug;
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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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--source include/explain-no-costs.inc
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evalp show explain format=JSON for $thr2;
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connection con1;
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reap;
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SET debug_dbug=@old_debug;
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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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--source include/explain-no-costs.inc
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evalp show explain format=JSON for $thr2;
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connection con1;
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reap;
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SET debug_dbug=@old_debug;
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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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# ^^ Is this at all possible after 5.3?
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# Maybe, for 5.3 try this:
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# - run before/after the parent has invoked child's optimization
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# - run after materialization
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--echo # Try to do SHOW EXPLAIN for a query that runs a SET command:
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--echo # I've found experimentally that select_id==2 here...
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--echo #
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create table t2 (a int);
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insert into t2 values (1),(2);
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set @show_explain_probe_select_id=3; # Stop in the subquery.
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SET debug_dbug='+d,show_explain_probe_join_exec_start';
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# t2 has 2 rows so we will stop in the subquery twice:
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# - first one to serve the SHOW ANALYZE request
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# - second one when waiting to be KILLed.
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send set @foo= (select max(a) from t2
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where a + (select max(a) from t0 where t0.a>t2.a) < 10000);
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connection default;
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--source include/wait_condition.inc
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--error ER_TARGET_NOT_EXPLAINABLE
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evalp show explain format=JSON for $thr2;
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evalp kill query $thr2;
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connection con1;
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--error ER_QUERY_INTERRUPTED
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reap;
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SET debug_dbug=@old_debug;
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drop table t2;
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--echo #
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--echo # Attempt SHOW EXPLAIN for an UPDATE
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--echo #
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create table t2 as select a as a, a as dummy from t0 limit 2;
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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 update t2 set dummy=0 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
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connection default;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=JSON for $thr2;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=JSON for $thr2;
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connection con1;
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reap;
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--echo #
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--echo # EXPLAIN FOR CONNECTION for an UPDATE
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--echo #
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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 update t2 set dummy=0 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
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connection default;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $thr2;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $thr2;
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connection con1;
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reap;
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drop table t2;
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SET debug_dbug=@old_debug;
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--echo #
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--echo # Attempt SHOW EXPLAIN for a DELETE
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--echo #
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create table t2 as select a as a, a as dummy from t0 limit 2;
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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 delete from t2 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
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connection default;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=JSON for $thr2;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=JSON for $thr2;
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connection con1;
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reap;
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drop table t2;
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SET debug_dbug=@old_debug;
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--echo #
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--echo # Attempt EXPLAIN FOR CONNECTION for a DELETE
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--echo #
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create table t2 as select a as a, a as dummy from t0 limit 2;
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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 delete from t2 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
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connection default;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $thr2;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $thr2;
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connection con1;
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reap;
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drop table t2;
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SET debug_dbug=@old_debug;
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--echo #
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--echo # Multiple SHOW EXPLAIN calls for one select
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--echo #
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create table t2 as select a as a, a as dummy from t0 limit 3;
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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 t2.a, ((select max(a) from t0 where t2.a + t0.a <3) >3) as SUBQ from t2;
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connection default;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=json for $thr2;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=json for $thr2;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=json for $thr2;
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connection con1;
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reap;
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drop table t2;
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SET debug_dbug=@old_debug;
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--echo #
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--echo # Multiple EXPLAIN FOR CONNECTION calls for one select
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--echo #
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create table t2 as select a as a, a as dummy from t0 limit 3;
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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 t2.a, ((select max(a) from t0 where t2.a + t0.a <3) >3) as SUBQ from t2;
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connection default;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $thr2;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $thr2;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp explain format=JSON for connection $thr2;
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connection con1;
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reap;
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drop table t2;
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SET debug_dbug=@old_debug;
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--echo #
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--echo # SHOW EXPLAIN for SELECT ... ORDER BY with "Using filesort"
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--echo #
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explain select * from t0 order by a;
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SET debug_dbug='+d,show_explain_probe_join_exec_start';
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set @show_explain_probe_select_id=1;
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send select * from t0 order by a;
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connection default;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=json for $thr2;
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connection con1;
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reap;
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SET debug_dbug=@old_debug;
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--echo #
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--echo # SHOW EXPLAIN for SELECT ... with "Using temporary"
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--echo #
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connection default;
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explain select distinct a from t0;
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connection con1;
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SET debug_dbug='+d,show_explain_probe_join_exec_start';
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set @show_explain_probe_select_id=1;
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send select distinct a from t0;
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connection default;
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--source include/wait_condition.inc
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--source include/explain-no-costs.inc
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evalp show explain format=json for $thr2;
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connection con1;
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reap;
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SET debug_dbug=@old_debug;
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--echo #
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--echo # SHOW EXPLAIN for SELECT ... with "Using temporary; Using filesort"
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--echo #
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connection default;
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explain select distinct a from t0;
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connection con1;
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|
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SET debug_dbug='+d,show_explain_probe_join_exec_start';
|
||
set @show_explain_probe_select_id=1;
|
||
|
||
send select distinct a from t0;
|
||
connection default;
|
||
--source include/wait_condition.inc
|
||
--source include/explain-no-costs.inc
|
||
evalp show explain format=json for $thr2;
|
||
connection con1;
|
||
reap;
|
||
SET debug_dbug=@old_debug;
|
||
|
||
|
||
--echo #
|
||
--echo # Check if queries in non-default charsets work.
|
||
--echo #
|
||
|
||
--disable_service_connection
|
||
|
||
set names cp1251;
|
||
# The below are two Russian letters with codes E3FB in cp1251 encoding.
|
||
select charset('<27><>');
|
||
select hex('<27><>');
|
||
|
||
set @show_explain_probe_select_id=1;
|
||
SET debug_dbug='+d,show_explain_probe_join_exec_start';
|
||
|
||
send
|
||
select * from t0 where length('<27><>') = a;
|
||
|
||
connection default;
|
||
set names utf8;
|
||
--source include/wait_condition.inc
|
||
--source include/explain-no-costs.inc
|
||
evalp show explain format=JSON for $thr2;
|
||
set names default;
|
||
|
||
connection con1;
|
||
# The constant should be two letters, the last looking like 'bl'
|
||
reap;
|
||
|
||
SET debug_dbug=@old_debug;
|
||
set names default;
|
||
|
||
drop table if exists t0,t1,t2;
|
||
|
||
--enable_service_connection
|
||
|
||
--echo #
|
||
--echo # MDEV-28124: Server crashes in Explain_aggr_filesort::print_json_members
|
||
--echo # upon SHOW ANALYZE/EXPLAIN FORMAT=JSON
|
||
--echo #
|
||
|
||
let $wait_condition= select State='show_explain_trap' from information_schema.processlist where id=$thr2;
|
||
connection con1;
|
||
set @show_explain_probe_query= 'SELECT count(*) - count(*) FROM sys.waits_by_user_by_latency';
|
||
set debug_dbug='+d,explain_notify_tables_are_closed';
|
||
|
||
# Statement guarantees to produce 0 on every run
|
||
send SELECT count(*) - count(*) FROM sys.waits_by_user_by_latency;
|
||
connection default;
|
||
--source include/wait_condition.inc
|
||
--error ER_TARGET_NOT_EXPLAINABLE
|
||
evalp SHOW EXPLAIN FORMAT=JSON FOR $thr2;
|
||
|
||
connection con1;
|
||
reap;
|
||
|
||
--echo # End
|
||
connection default;
|
||
disconnect con1;
|
||
set debug_sync='RESET';
|
||
|