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MDEV-4011 Added per thread memory counting and usage
Base code and idea from a patch from by plinux at Taobao. The idea is that we mark all memory that are thread specific with MY_THREAD_SPECIFIC. Memory counting is done per thread in the my_malloc_size_cb_func callback function from my_malloc(). There are plenty of new asserts to ensure that for a debug server the counting is correct. Information_schema.processlist gets two new columns: MEMORY_USED and EXAMINED_ROWS. - The later is there mainly to show how query is progressing. The following changes in interfaces was needed to get this to work: - init_alloc_root() amd init_sql_alloc() has extra option so that one can mark memory with MY_THREAD_SPECIFIC - One now have to use alloc_root_set_min_malloc() to set min memory to be allocated by alloc_root() - my_init_dynamic_array() has extra option so that one can mark memory with MY_THREAD_SPECIFIC - my_net_init() has extra option so that one can mark memory with MY_THREAD_SPECIFIC - Added flag for hash_init() so that one can mark hash table to be thread specific. - Added flags to init_tree() so that one can mark tree to be thread specific. - Removed with_delete option to init_tree(). Now one should instead use MY_TREE_WITH_DELETE_FLAG. - Added flag to Warning_info::Warning_info() if the structure should be fully initialized. - String elements can now be marked as thread specific. - Internal HEAP tables are now marking it's memory as MY_THREAD_SPECIFIC. - Changed type of myf from int to ulong, as this is always a set of bit flags. Other things: - Removed calls to net_end() and thd->cleanup() as these are now done in ~THD() - We now also show EXAMINED_ROWS in SHOW PROCESSLIST - Added new variable 'memory_used' - Fixed bug where kill_threads_for_user() was using the wrong mem_root to allocate memory. - Removed calls to the obsoleted function init_dynamic_array() - Use set_current_thd() instead of my_pthread_setspecific_ptr(THR_THD,...) client/completion_hash.cc: Updated call to init_alloc_root() client/mysql.cc: Updated call to init_alloc_root() client/mysqlbinlog.cc: init_dynamic_array() -> my_init_dynamic_array() Updated call to init_alloc_root() client/mysqlcheck.c: Updated call to my_init_dynamic_array() client/mysqldump.c: Updated call to init_alloc_root() client/mysqltest.cc: Updated call to init_alloc_root() Updated call to my_init_dynamic_array() Fixed compiler warnings extra/comp_err.c: Updated call to my_init_dynamic_array() extra/resolve_stack_dump.c: Updated call to my_init_dynamic_array() include/hash.h: Added HASH_THREAD_SPECIFIC include/heap.h: Added flag is internal temporary table. include/my_dir.h: Safety fix: Ensure that MY_DONT_SORT and MY_WANT_STAT don't interfer with other mysys flags include/my_global.h: Changed type of myf from int to ulong, as this is always a set of bit flags. include/my_sys.h: Added MY_THREAD_SPECIFIC and MY_THREAD_MOVE Added malloc_flags to DYNAMIC_ARRAY Added extra mysys flag argument to my_init_dynamic_array() Removed deprecated functions init_dynamic_array() and my_init_dynamic_array.._ci Updated paramaters for init_alloc_root() include/my_tree.h: Added my_flags to allow one to use MY_THREAD_SPECIFIC with hash tables. Removed with_delete. One should now instead use MY_TREE_WITH_DELETE_FLAG Updated parameters to init_tree() include/myisamchk.h: Added malloc_flags to allow one to use MY_THREAD_SPECIFIC for checks. include/mysql.h: Added MYSQL_THREAD_SPECIFIC_MALLOC Used 'unused1' to mark memory as thread specific. include/mysql.h.pp: Updated file include/mysql_com.h: Used 'unused1' to mark memory as thread specific. Updated parameters for my_net_init() libmysql/libmysql.c: Updated call to init_alloc_root() to mark memory thread specific. libmysqld/emb_qcache.cc: Updated call to init_alloc_root() libmysqld/lib_sql.cc: Updated call to init_alloc_root() mysql-test/r/create.result: Updated results mysql-test/r/user_var.result: Updated results mysql-test/suite/funcs_1/datadict/processlist_priv.inc: Update to handle new format of SHOW PROCESSLIST mysql-test/suite/funcs_1/datadict/processlist_val.inc: Update to handle new format of SHOW PROCESSLIST mysql-test/suite/funcs_1/r/is_columns_is.result: Update to handle new format of SHOW PROCESSLIST mysql-test/suite/funcs_1/r/processlist_priv_no_prot.result: Updated results mysql-test/suite/funcs_1/r/processlist_val_no_prot.result: Updated results mysql-test/t/show_explain.test: Fixed usage of debug variable so that one can run test with --debug mysql-test/t/user_var.test: Added test of memory_usage variable. mysys/array.c: Added extra my_flags option to init_dynamic_array() and init_dynamic_array2() so that one can mark memory with MY_THREAD_SPECIFIC All allocated memory is marked with the given my_flags. Removed obsolete function init_dynamic_array() mysys/default.c: Updated call to init_alloc_root() Updated call to my_init_dynamic_array() mysys/hash.c: Updated call to my_init_dynamic_array_ci(). Allocated memory is marked with MY_THREAD_SPECIFIC if HASH_THREAD_SPECIFIC is used. mysys/ma_dyncol.c: init_dynamic_array() -> my_init_dynamic_array() Added #if to get rid of compiler warnings mysys/mf_tempdir.c: Updated call to my_init_dynamic_array() mysys/my_alloc.c: Added extra parameter to init_alloc_root() so that one can mark memory with MY_THREAD_SPECIFIC Extend MEM_ROOT with a flag if memory is thread specific. This is stored in block_size, to keep the size of the MEM_ROOT object identical as before. Allocated memory is marked with MY_THREAD_SPECIFIC if used with init_alloc_root() mysys/my_chmod.c: Updated DBUG_PRINT because of change of myf type mysys/my_chsize.c: Updated DBUG_PRINT because of change of myf type mysys/my_copy.c: Updated DBUG_PRINT because of change of myf type mysys/my_create.c: Updated DBUG_PRINT because of change of myf type mysys/my_delete.c: Updated DBUG_PRINT because of change of myf type mysys/my_error.c: Updated DBUG_PRINT because of change of myf type mysys/my_fopen.c: Updated DBUG_PRINT because of change of myf type mysys/my_fstream.c: Updated DBUG_PRINT because of change of myf type mysys/my_getwd.c: Updated DBUG_PRINT because of change of myf type mysys/my_lib.c: Updated call to init_alloc_root() Updated call to my_init_dynamic_array() Updated DBUG_PRINT because of change of myf type mysys/my_lock.c: Updated DBUG_PRINT because of change of myf type mysys/my_malloc.c: Store at start of each allocated memory block the size of the block and if the block is thread specific. Call malloc_size_cb_func, if set, with the memory allocated/freed. Updated DBUG_PRINT because of change of myf type mysys/my_open.c: Updated DBUG_PRINT because of change of myf type mysys/my_pread.c: Updated DBUG_PRINT because of change of myf type mysys/my_read.c: Updated DBUG_PRINT because of change of myf type mysys/my_redel.c: Updated DBUG_PRINT because of change of myf type mysys/my_rename.c: Updated DBUG_PRINT because of change of myf type mysys/my_seek.c: Updated DBUG_PRINT because of change of myf type mysys/my_sync.c: Updated DBUG_PRINT because of change of myf type mysys/my_thr_init.c: Ensure that one can call my_thread_dbug_id() even if thread is not properly initialized. mysys/my_write.c: Updated DBUG_PRINT because of change of myf type mysys/mysys_priv.h: Updated parameters to sf_malloc and sf_realloc() mysys/safemalloc.c: Added checking that for memory marked with MY_THREAD_SPECIFIC that it's the same thread that is allocation and freeing the memory. Added sf_malloc_dbug_id() to allow MariaDB to specify which THD is handling the memory. Added my_flags arguments to sf_malloc() and sf_realloc() to be able to mark memory with MY_THREAD_SPECIFIC. Added sf_report_leaked_memory() to get list of memory not freed by a thread. mysys/tree.c: Added flags to init_tree() so that one can mark tree to be thread specific. Removed with_delete option to init_tree(). Now one should instead use MY_TREE_WITH_DELETE_FLAG. Updated call to init_alloc_root() All allocated memory is marked with the given malloc flags mysys/waiting_threads.c: Updated call to my_init_dynamic_array() sql-common/client.c: Updated call to init_alloc_root() and my_net_init() to mark memory thread specific. Updated call to my_init_dynamic_array(). Added MYSQL_THREAD_SPECIFIC_MALLOC so that client can mark memory as MY_THREAD_SPECIFIC. sql-common/client_plugin.c: Updated call to init_alloc_root() sql/debug_sync.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/event_scheduler.cc: Removed calls to net_end() as this is now done in ~THD() Call set_current_thd() to ensure that memory is assigned to right thread. sql/events.cc: my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/filesort.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/filesort_utils.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/ha_ndbcluster.cc: Updated call to init_alloc_root() Updated call to my_net_init() Removed calls to net_end() and thd->cleanup() as these are now done in ~THD() sql/ha_ndbcluster_binlog.cc: Updated call to my_net_init() Updated call to init_sql_alloc() Removed calls to net_end() and thd->cleanup() as these are now done in ~THD() sql/ha_partition.cc: Updated call to init_alloc_root() sql/handler.cc: Added MY_THREAD_SPECIFIC to allocated memory. Added missing call to my_dir_end() sql/item_func.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/item_subselect.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/item_sum.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/log.cc: More DBUG Updated call to init_alloc_root() sql/mdl.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/mysqld.cc: Added total_memory_used Updated call to init_alloc_root() Move mysql_cond_broadcast() before my_thread_end() Added mariadb_dbug_id() to count memory per THD instead of per thread. Added my_malloc_size_cb_func() callback function for my_malloc() to count memory. Move initialization of mysqld_server_started and mysqld_server_initialized earlier. Updated call to my_init_dynamic_array(). Updated call to my_net_init(). Call my_pthread_setspecific_ptr(THR_THD,...) to ensure that memory is assigned to right thread. Added status variable 'memory_used'. Updated call to init_alloc_root() my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/mysqld.h: Added set_current_thd() sql/net_serv.cc: Added new parameter to my_net_init() so that one can mark memory with MY_THREAD_SPECIFIC. Store in net->thread_specific_malloc if memory is thread specific. Mark memory to be thread specific if requested. sql/opt_range.cc: Updated call to my_init_dynamic_array() Updated call to init_sql_alloc() Added MY_THREAD_SPECIFIC to allocated memory. sql/opt_subselect.cc: Updated call to init_sql_alloc() to mark memory thread specific. sql/protocol.cc: Fixed compiler warning sql/records.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/rpl_filter.cc: Updated call to my_init_dynamic_array() sql/rpl_handler.cc: Updated call to my_init_dynamic_array2() sql/rpl_handler.h: Updated call to init_sql_alloc() sql/rpl_mi.cc: Updated call to my_init_dynamic_array() sql/rpl_tblmap.cc: Updated call to init_alloc_root() sql/rpl_utility.cc: Updated call to my_init_dynamic_array() sql/slave.cc: Initialize things properly before calling functions that allocate memory. Removed calls to net_end() as this is now done in ~THD() sql/sp_head.cc: Updated call to init_sql_alloc() Updated call to my_init_dynamic_array() Added parameter to warning_info() that it should be fully initialized. sql/sp_pcontext.cc: Updated call to my_init_dynamic_array() sql/sql_acl.cc: Updated call to init_sql_alloc() Updated call to my_init_dynamic_array() my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/sql_admin.cc: Added parameter to warning_info() that it should be fully initialized. sql/sql_analyse.h: Updated call to init_tree() to mark memory thread specific. sql/sql_array.h: Updated call to my_init_dynamic_array() to mark memory thread specific. sql/sql_audit.cc: Updated call to my_init_dynamic_array() sql/sql_base.cc: Updated call to init_sql_alloc() my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/sql_cache.cc: Updated comment sql/sql_class.cc: Added parameter to warning_info() that not initialize it until THD is fully created. Updated call to init_sql_alloc() Mark THD::user_vars has to be thread specific. Updated call to my_init_dynamic_array() Ensure that memory allocated by THD is assigned to the THD. More DBUG Always acll net_end() in ~THD() Assert that all memory signed to this THD is really deleted at ~THD. Fixed set_status_var_init() to not reset memory_used. my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/sql_class.h: Added MY_THREAD_SPECIFIC to allocated memory. Added malloc_size to THD to record allocated memory per THD. sql/sql_delete.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/sql_error.cc: Added 'initialize' parameter to Warning_info() to say if should allocate memory for it's structures. This is used by THD::THD() to not allocate memory until THD is ready. Added Warning_info::free_memory() sql/sql_error.h: Updated Warning_info() class. sql/sql_handler.cc: Updated call to init_alloc_root() to mark memory thread specific. sql/sql_insert.cc: More DBUG sql/sql_join_cache.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/sql_lex.cc: Updated call to my_init_dynamic_array() sql/sql_lex.h: Updated call to my_init_dynamic_array() sql/sql_load.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/sql_parse.cc: Removed calls to net_end() and thd->cleanup() as these are now done in ~THD() Ensure that examined_row_count() is reset before query. Fixed bug where kill_threads_for_user() was using the wrong mem_root to allocate memory. my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() Don't restore thd->status_var.memory_used when restoring thd->status_var sql/sql_plugin.cc: Updated call to init_alloc_root() Updated call to my_init_dynamic_array() Don't allocate THD on the stack, as this causes problems with valgrind when doing thd memory counting. my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/sql_prepare.cc: Added parameter to warning_info() that it should be fully initialized. Updated call to init_sql_alloc() to mark memory thread specific. sql/sql_reload.cc: my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/sql_select.cc: Updated call to my_init_dynamic_array() and init_sql_alloc() to mark memory thread specific. Added MY_THREAD_SPECIFIC to allocated memory. More DBUG sql/sql_servers.cc: Updated call to init_sql_alloc() to mark memory some memory thread specific. my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/sql_show.cc: Updated call to my_init_dynamic_array() Mark my_dir() memory thread specific. Use my_pthread_setspecific_ptr(THR_THD,...) to mark that allocated memory should be allocated to calling thread. More DBUG. Added malloc_size and examined_row_count to SHOW PROCESSLIST. Added MY_THREAD_SPECIFIC to allocated memory. Updated call to init_sql_alloc() Added parameter to warning_info() that it should be fully initialized. sql/sql_statistics.cc: Fixed compiler warning sql/sql_string.cc: String elements can now be marked as thread specific. sql/sql_string.h: String elements can now be marked as thread specific. sql/sql_table.cc: Updated call to init_sql_alloc() and my_malloc() to mark memory thread specific my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() Fixed compiler warning sql/sql_test.cc: Updated call to my_init_dynamic_array() to mark memory thread specific. sql/sql_trigger.cc: Updated call to init_sql_alloc() sql/sql_udf.cc: Updated call to init_sql_alloc() my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/sql_update.cc: Added MY_THREAD_SPECIFIC to allocated memory. sql/table.cc: Updated call to init_sql_alloc(). Mark memory used by temporary tables, that are not for slave threads, as MY_THREAD_SPECIFIC Updated call to init_sql_alloc() sql/thr_malloc.cc: Added my_flags argument to init_sql_alloc() to be able to mark memory as MY_THREAD_SPECIFIC. sql/thr_malloc.h: Updated prototype for init_sql_alloc() sql/tztime.cc: Updated call to init_sql_alloc() Updated call to init_alloc_root() to mark memory thread specific. my_pthread_setspecific_ptr(THR_THD,...) -> set_current_thd() sql/uniques.cc: Updated calls to init_tree(), my_init_dynamic_array() and my_malloc() to mark memory thread specific. sql/unireg.cc: Added MY_THREAD_SPECIFIC to allocated memory. storage/csv/ha_tina.cc: Updated call to init_alloc_root() storage/federated/ha_federated.cc: Updated call to init_alloc_root() Updated call to my_init_dynamic_array() Ensure that memory allocated by fedarated is registered for the system, not for the thread. storage/federatedx/federatedx_io_mysql.cc: Updated call to my_init_dynamic_array() storage/federatedx/ha_federatedx.cc: Updated call to init_alloc_root() Updated call to my_init_dynamic_array() storage/heap/ha_heap.cc: Added MY_THREAD_SPECIFIC to allocated memory. storage/heap/heapdef.h: Added parameter to hp_get_new_block() to be able to do thread specific memory tagging. storage/heap/hp_block.c: Added parameter to hp_get_new_block() to be able to do thread specific memory tagging. storage/heap/hp_create.c: - Internal HEAP tables are now marking it's memory as MY_THREAD_SPECIFIC. - Use MY_TREE_WITH_DELETE instead of removed option 'with_delete'. storage/heap/hp_open.c: Internal HEAP tables are now marking it's memory as MY_THREAD_SPECIFIC. storage/heap/hp_write.c: Added new parameter to hp_get_new_block() storage/maria/ma_bitmap.c: Updated call to my_init_dynamic_array() storage/maria/ma_blockrec.c: Updated call to my_init_dynamic_array() storage/maria/ma_check.c: Updated call to init_alloc_root() storage/maria/ma_ft_boolean_search.c: Updated calls to init_tree() and init_alloc_root() storage/maria/ma_ft_nlq_search.c: Updated call to init_tree() storage/maria/ma_ft_parser.c: Updated call to init_tree() Updated call to init_alloc_root() storage/maria/ma_loghandler.c: Updated call to my_init_dynamic_array() storage/maria/ma_open.c: Updated call to my_init_dynamic_array() storage/maria/ma_sort.c: Updated call to my_init_dynamic_array() storage/maria/ma_write.c: Updated calls to my_init_dynamic_array() and init_tree() storage/maria/maria_pack.c: Updated call to init_tree() storage/maria/unittest/sequence_storage.c: Updated call to my_init_dynamic_array() storage/myisam/ft_boolean_search.c: Updated call to init_tree() Updated call to init_alloc_root() storage/myisam/ft_nlq_search.c: Updated call to init_tree() storage/myisam/ft_parser.c: Updated call to init_tree() Updated call to init_alloc_root() storage/myisam/ft_stopwords.c: Updated call to init_tree() storage/myisam/mi_check.c: Updated call to init_alloc_root() storage/myisam/mi_write.c: Updated call to my_init_dynamic_array() Updated call to init_tree() storage/myisam/myisamlog.c: Updated call to init_tree() storage/myisam/myisampack.c: Updated call to init_tree() storage/myisam/sort.c: Updated call to my_init_dynamic_array() storage/myisammrg/ha_myisammrg.cc: Updated call to init_sql_alloc() storage/perfschema/pfs_check.cc: Rest current_thd storage/perfschema/pfs_instr.cc: Removed DBUG_ENTER/DBUG_VOID_RETURN as at this point my_thread_var is not allocated anymore, which can cause problems. support-files/compiler_warnings.supp: Disable compiler warning from offsetof macro.
This commit is contained in:
Michael Widenius
@ -1762,7 +1762,9 @@ t1 CREATE TABLE `t1` (
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`TIME_MS` decimal(22,3) NOT NULL DEFAULT '0.000',
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`STAGE` tinyint(2) NOT NULL DEFAULT '0',
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`MAX_STAGE` tinyint(2) NOT NULL DEFAULT '0',
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`PROGRESS` decimal(7,3) NOT NULL DEFAULT '0.000'
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`PROGRESS` decimal(7,3) NOT NULL DEFAULT '0.000',
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`MEMORY_USED` int(7) NOT NULL DEFAULT '0',
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`EXAMINED_ROWS` int(7) NOT NULL DEFAULT '0'
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) DEFAULT CHARSET=utf8
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drop table t1;
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create temporary table t1 like information_schema.processlist;
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@ -1780,7 +1782,9 @@ t1 CREATE TEMPORARY TABLE `t1` (
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`TIME_MS` decimal(22,3) NOT NULL DEFAULT '0.000',
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`STAGE` tinyint(2) NOT NULL DEFAULT '0',
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`MAX_STAGE` tinyint(2) NOT NULL DEFAULT '0',
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`PROGRESS` decimal(7,3) NOT NULL DEFAULT '0.000'
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`PROGRESS` decimal(7,3) NOT NULL DEFAULT '0.000',
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`MEMORY_USED` int(7) NOT NULL DEFAULT '0',
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`EXAMINED_ROWS` int(7) NOT NULL DEFAULT '0'
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) DEFAULT CHARSET=utf8
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drop table t1;
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create table t1 like information_schema.character_sets;
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@ -1,5 +1,6 @@
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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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SET @old_debug= @@session.debug;
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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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@ -12,12 +13,13 @@ show explain for 2000000000;
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ERROR HY000: Unknown thread id: 2000000000
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show explain for (select max(a) from t0);
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ERROR HY000: You may only use constant expressions in this statement
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SET @old_debug= @@session.debug;
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show explain for $thr2;
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ERROR HY000: Target is not running an EXPLAINable command
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show explain for $thr1;
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ERROR HY000: Target is not running an EXPLAINable command
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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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set debug_dbug='+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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@ -46,9 +48,10 @@ Note 1003 explain select max(c) from t1 where a < 10
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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 index condition; Rowid-ordered scan
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set optimizer_switch= @show_expl_tmp;
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set debug_dbug=@old_debug;
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# 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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set debug_dbug='+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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@ -61,9 +64,10 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY A ALL NULL NULL NULL NULL 10
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2 UNION B ALL NULL NULL NULL NULL 10
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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set debug_dbug=@old_debug;
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# 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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set debug_dbug='+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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@ -76,9 +80,10 @@ id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY A ALL NULL NULL NULL NULL 10
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2 UNION B ALL NULL NULL NULL NULL 10
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NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
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set debug_dbug=@old_debug;
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# 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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set debug_dbug='+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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@ -88,9 +93,10 @@ Warnings:
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Note 1003 select a, (select max(a) from t0 B) from t0 A where a<1
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a (select max(a) from t0 B)
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0 9
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set debug_dbug=@old_debug;
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# 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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set debug_dbug='+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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@ -101,9 +107,10 @@ Note 1003 explain select a, (select max(a) from t0 B) from t0 A where a<1
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY A ALL NULL NULL NULL NULL 10 Using where
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2 SUBQUERY B ALL NULL NULL NULL NULL 10
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set debug_dbug=@old_debug;
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# correlated subquery, select
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -113,9 +120,10 @@ Warnings:
|
||||
Note 1003 select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1
|
||||
a (select max(a) from t0 b where b.a+a.a<10)
|
||||
0 9
|
||||
set debug_dbug=@old_debug;
|
||||
# correlated subquery, explain
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -125,9 +133,10 @@ Warnings:
|
||||
Note 1003 select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1
|
||||
a (select max(a) from t0 b where b.a+a.a<10)
|
||||
0 9
|
||||
set debug_dbug=@old_debug;
|
||||
# correlated subquery, select, while inside the subquery
|
||||
set @show_explain_probe_select_id=2;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -137,9 +146,10 @@ Warnings:
|
||||
Note 1003 select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1
|
||||
a (select max(a) from t0 b where b.a+a.a<10)
|
||||
0 9
|
||||
set debug_dbug=@old_debug;
|
||||
# correlated subquery, explain, while inside the subquery
|
||||
set @show_explain_probe_select_id=2;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -149,52 +159,57 @@ Warnings:
|
||||
Note 1003 select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1
|
||||
a (select max(a) from t0 b where b.a+a.a<10)
|
||||
0 9
|
||||
set debug_dbug=@old_debug;
|
||||
# correlated subquery, explain, while inside the subquery
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_end';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_end';
|
||||
select a, (select max(a) from t0 b where b.a+a.a<10) from t0 a where a<1;
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
a (select max(a) from t0 b where b.a+a.a<10)
|
||||
0 9
|
||||
set debug_dbug=@old_debug;
|
||||
# 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_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
set @foo= (select max(a) from t0 where sin(a) >0);
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# 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_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
update t2 set dummy=0 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
drop table t2;
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# 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_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
delete from t2 where (select max(a) from t0 where t2.a + t0.a <3) >3 ;
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
drop table t2;
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# 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_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
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
|
||||
@ -219,13 +234,14 @@ a SUBQ
|
||||
1 0
|
||||
2 0
|
||||
drop table t2;
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# SHOW EXPLAIN for SELECT ... ORDER BY with "Using filesort"
|
||||
#
|
||||
explain select * from t0 order by a;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using filesort
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
set @show_explain_probe_select_id=1;
|
||||
select * from t0 order by a;
|
||||
show explain for $thr2;
|
||||
@ -244,13 +260,14 @@ a
|
||||
7
|
||||
8
|
||||
9
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# SHOW EXPLAIN for SELECT ... with "Using temporary"
|
||||
#
|
||||
explain select distinct a from t0;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using temporary
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
set @show_explain_probe_select_id=1;
|
||||
select distinct a from t0;
|
||||
show explain for $thr2;
|
||||
@ -269,13 +286,14 @@ a
|
||||
7
|
||||
8
|
||||
9
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# SHOW EXPLAIN for SELECT ... with "Using temporary; Using filesort"
|
||||
#
|
||||
explain select distinct a from t0;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using temporary
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
set @show_explain_probe_select_id=1;
|
||||
select distinct a from t0;
|
||||
show explain for $thr2;
|
||||
@ -294,7 +312,7 @@ a
|
||||
7
|
||||
8
|
||||
9
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# MDEV-238: SHOW EXPLAIN: Server crashes in JOIN::print_explain with FROM subquery and GROUP BY
|
||||
#
|
||||
@ -304,7 +322,7 @@ explain SELECT alias.a FROM t2, ( SELECT * FROM t2 ) AS alias GROUP BY alias.a;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 5 Using join buffer (flat, BNL join)
|
||||
set debug_dbug='d,show_explain_in_find_all_keys';
|
||||
set debug_dbug='+d,show_explain_in_find_all_keys';
|
||||
SELECT alias.a FROM t2, ( SELECT * FROM t2 ) AS alias GROUP BY alias.a;
|
||||
# FIXED by "conservative assumptions about when QEP is available" fix:
|
||||
# NOTE: current code will not show "Using join buffer":
|
||||
@ -314,7 +332,7 @@ a
|
||||
1
|
||||
2
|
||||
4
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t2;
|
||||
#
|
||||
# MDEV-239: Assertion `field_types == 0 ... ' failed in Protocol_text::store(double, uint32, String*) with
|
||||
@ -329,7 +347,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
|
||||
Warnings:
|
||||
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` join `test`.`t2` group by `test`.`t2`.`a`
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_end';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_end';
|
||||
EXPLAIN EXTENDED SELECT alias.a FROM t2, ( SELECT * FROM t2 ) AS alias GROUP BY alias.a ;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -342,7 +360,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 5 100.00 Using join buffer (flat, BNL join)
|
||||
Warnings:
|
||||
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` join `test`.`t2` group by `test`.`t2`.`a`
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t2;
|
||||
#
|
||||
# MDEV-240: SHOW EXPLAIN: Assertion `this->optimized == 2' failed in
|
||||
@ -359,7 +377,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t2 ALL NULL NULL NULL NULL 6
|
||||
2 DERIVED t3 system NULL NULL NULL NULL 1
|
||||
set @show_explain_probe_select_id=2;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_end';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_end';
|
||||
SELECT * FROM v1, t2;
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
@ -370,14 +388,14 @@ a b
|
||||
8 7
|
||||
8 8
|
||||
8 9
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP VIEW v1;
|
||||
DROP TABLE t2, t3;
|
||||
#
|
||||
# MDEV-267: SHOW EXPLAIN: Server crashes in JOIN::print_explain on most of queries
|
||||
#
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_end';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_end';
|
||||
select sleep(1);
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -386,29 +404,29 @@ Warnings:
|
||||
Note 1003 select sleep(1)
|
||||
sleep(1)
|
||||
0
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# Same as above, but try another reason for JOIN to be degenerate
|
||||
#
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_end';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_end';
|
||||
select * from t0 where 1>10;
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
a
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# Same as above, but try another reason for JOIN to be degenerate (2)
|
||||
#
|
||||
create table t3(a int primary key);
|
||||
insert into t3 select a from t0;
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_end';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_end';
|
||||
select * from t0,t3 where t3.a=112233;
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
a a
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
drop table t3;
|
||||
#
|
||||
# MDEV-270: SHOW EXPLAIN: server crashes in JOIN::print_explain on a query with
|
||||
@ -427,7 +445,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
2 SUBQUERY t2 const PRIMARY PRIMARY 4 const 1 Using where
|
||||
3 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
|
||||
set @show_explain_probe_select_id=2;
|
||||
set debug_dbug='d,show_explain_probe_do_select';
|
||||
set debug_dbug='+d,show_explain_probe_do_select';
|
||||
SELECT * FROM t2 WHERE a =
|
||||
(SELECT MAX(a) FROM t2
|
||||
WHERE pk= (SELECT MAX(pk) FROM t2 WHERE pk = 3)
|
||||
@ -447,7 +465,7 @@ pk a
|
||||
6 7
|
||||
7 7
|
||||
9 7
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
drop table t2;
|
||||
#
|
||||
# MDEV-273: SHOW EXPLAIN: server crashes in JOIN::print_explain on a query with impossible WHERE
|
||||
@ -479,7 +497,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t3 ALL NULL NULL NULL NULL 87 Using join buffer (flat, BNL join)
|
||||
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_do_select';
|
||||
set debug_dbug='+d,show_explain_probe_do_select';
|
||||
SELECT count(*) FROM t2, t3
|
||||
WHERE a1 < ALL (
|
||||
SELECT a1 FROM t2
|
||||
@ -498,7 +516,7 @@ WHERE a1 IN ( SELECT a1 FROM t2, t4 )
|
||||
)
|
||||
count(*)
|
||||
1740
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
drop table t2, t3, t4;
|
||||
#
|
||||
# MDEV-275: SHOW EXPLAIN: server crashes in JOIN::print_explain with IN subquery and aggregate function
|
||||
@ -508,12 +526,12 @@ INSERT INTO t2 VALUES
|
||||
(1,5),(2,4),(3,6),(4,9),(5,2),(6,8),(7,4),(8,8),(9,0),(10,43),
|
||||
(11,23),(12,3),(13,45),(14,16),(15,2),(16,33),(17,2),(18,5),(19,9),(20,2);
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_end';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_end';
|
||||
SELECT * FROM t2 WHERE (5, 78) IN (SELECT `a1`, MAX(`a1`) FROM t2 GROUP BY `a1`);
|
||||
show explain for $thr2;
|
||||
ERROR HY000: Target is not running an EXPLAINable command
|
||||
pk a1
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t2;
|
||||
DROP TABLE t1;
|
||||
#
|
||||
@ -522,7 +540,7 @@ DROP TABLE t1;
|
||||
CREATE TABLE t1(a INT, KEY(a));
|
||||
INSERT INTO t1 VALUES (3),(1),(5),(1);
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
SELECT 'test' FROM t1 WHERE a=1;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -532,7 +550,7 @@ Note 1003 SELECT 'test' FROM t1 WHERE a=1
|
||||
test
|
||||
test
|
||||
test
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t1;
|
||||
#
|
||||
# MDEV-299: SHOW EXPLAIN: Plan produced by SHOW EXPLAIN changes back and forth during query execution
|
||||
@ -550,7 +568,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE A ALL NULL NULL NULL NULL 100 Using where
|
||||
1 SIMPLE B ALL key1 NULL NULL NULL 100 Range checked for each record (index map: 0x1)
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_test_if_quick_select';
|
||||
set debug_dbug='+d,show_explain_probe_test_if_quick_select';
|
||||
select count(*) from t1 A, t1 B where B.key1 < A.col2 and A.col1=3 AND B.col2 + 1 < 100;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -578,7 +596,7 @@ Warnings:
|
||||
Note 1003 select count(*) from t1 A, t1 B where B.key1 < A.col2 and A.col1=3 AND B.col2 + 1 < 100
|
||||
count(*)
|
||||
212
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
drop table t1;
|
||||
#
|
||||
# MDEV-297: SHOW EXPLAIN: Server gets stuck until timeout occurs while
|
||||
@ -587,7 +605,7 @@ drop table t1;
|
||||
CREATE TABLE t1(a INT, b INT, c INT, KEY(a), KEY(b), KEY(c));
|
||||
INSERT INTO t1 (a) VALUES (3),(1),(5),(1);
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
SHOW INDEX FROM t1;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -598,7 +616,7 @@ Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_par
|
||||
t1 1 a 1 a A NULL NULL NULL YES BTREE
|
||||
t1 1 b 1 b A NULL NULL NULL YES BTREE
|
||||
t1 1 c 1 c A NULL NULL NULL YES BTREE
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t1;
|
||||
#
|
||||
# MDEV-324: SHOW EXPLAIN: Plan produced by SHOW EXPLAIN for a query with TEMPTABLE view
|
||||
@ -611,7 +629,7 @@ EXPLAIN SELECT a + 1 FROM v1;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2
|
||||
2 DERIVED t1 ALL NULL NULL NULL NULL 2
|
||||
set debug_dbug='d,show_explain_probe_join_tab_preread';
|
||||
set debug_dbug='+d,show_explain_probe_join_tab_preread';
|
||||
set @show_explain_probe_select_id=1;
|
||||
SELECT a + 1 FROM v1;
|
||||
show explain for $thr2;
|
||||
@ -623,7 +641,7 @@ Note 1003 SELECT a + 1 FROM v1
|
||||
a + 1
|
||||
2
|
||||
3
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP VIEW v1;
|
||||
DROP TABLE t1;
|
||||
#
|
||||
@ -639,7 +657,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
|
||||
3 DEPENDENT UNION NULL NULL NULL NULL NULL NULL NULL No tables used
|
||||
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
|
||||
set debug_dbug='d,show_explain_probe_union_read';
|
||||
set debug_dbug='+d,show_explain_probe_union_read';
|
||||
SELECT a FROM t1 WHERE a IN ( SELECT 1+SLEEP(0.01) UNION SELECT 2 );
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -658,7 +676,7 @@ NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
|
||||
Warnings:
|
||||
Note 1003 SELECT a FROM t1 WHERE a IN ( SELECT 1+SLEEP(0.01) UNION SELECT 2 )
|
||||
a
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t1;
|
||||
#
|
||||
# MDEV-327: SHOW EXPLAIN: Different select_type in plans produced by SHOW EXPLAIN
|
||||
@ -681,7 +699,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
3 SUBQUERY t1 ALL NULL NULL NULL NULL 20
|
||||
3 SUBQUERY t2 ALL NULL NULL NULL NULL 20 Using where
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
SELECT * FROM t1, ( SELECT * FROM t2 ) AS alias
|
||||
WHERE a < ALL ( SELECT b FROM t1, t2 WHERE a = b );
|
||||
show explain for $thr2;
|
||||
@ -694,7 +712,7 @@ Warnings:
|
||||
Note 1003 SELECT * FROM t1, ( SELECT * FROM t2 ) AS alias
|
||||
WHERE a < ALL ( SELECT b FROM t1, t2 WHERE a = b )
|
||||
a b
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t1, t2;
|
||||
#
|
||||
# Test that SHOW EXPLAIN will print 'Distinct'.
|
||||
@ -716,7 +734,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 4 Using index; Using temporary
|
||||
1 SIMPLE t3 ref a a 5 test.t1.a 7 Using index; Distinct
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select distinct t1.a from t1,t3 where t1.a=t3.a;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -727,7 +745,7 @@ Note 1003 select distinct t1.a from t1,t3 where t1.a=t3.a
|
||||
a
|
||||
1
|
||||
2
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
drop table t1,t3,t4;
|
||||
#
|
||||
# ---------- SHOW EXPLAIN and permissions -----------------
|
||||
@ -738,7 +756,7 @@ grant super on *.* to test2@localhost;
|
||||
# First, make sure that user 'test2' cannot do SHOW EXPLAIN on us
|
||||
#
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select * from t0 where a < 3;
|
||||
show explain for $thr2;
|
||||
ERROR 42000: Access denied; you need (at least one of) the PROCESS privilege(s) for this operation
|
||||
@ -751,12 +769,12 @@ a
|
||||
0
|
||||
1
|
||||
2
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
#
|
||||
# Check that user test2 can do SHOW EXPLAIN on its own queries
|
||||
#
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select * from t0 where a < 3;
|
||||
show explain for $thr_con2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -771,8 +789,9 @@ a
|
||||
# Now, grant test2 a PROCESSLIST permission, and see that he's able to observe us
|
||||
#
|
||||
grant process on *.* to test2@localhost;
|
||||
set debug_dbug=@old_debug;
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select * from t0 where a < 3;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -783,7 +802,7 @@ a
|
||||
0
|
||||
1
|
||||
2
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
revoke all privileges on test.* from test2@localhost;
|
||||
drop user test2@localhost;
|
||||
#
|
||||
@ -848,7 +867,7 @@ ORDER BY b;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 index_merge a,b a,b 5,5 NULL 8 Using sort_union(a,b); Using where; Using filesort
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
SELECT a+SLEEP(0.01) FROM t1
|
||||
WHERE a IN ( 255, 0 ) OR b BETWEEN 6 AND 129
|
||||
ORDER BY b;
|
||||
@ -867,8 +886,9 @@ a+SLEEP(0.01)
|
||||
0
|
||||
0
|
||||
0
|
||||
set debug_dbug=@old_debug;
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_do_select';
|
||||
set debug_dbug='+d,show_explain_probe_do_select';
|
||||
SELECT a+SLEEP(0.01) FROM t1
|
||||
WHERE a IN ( 255, 0 ) OR b BETWEEN 6 AND 129
|
||||
ORDER BY b;
|
||||
@ -887,7 +907,7 @@ a+SLEEP(0.01)
|
||||
0
|
||||
0
|
||||
0
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
drop table t1;
|
||||
#
|
||||
# MDEV-298: SHOW EXPLAIN: Plan returned by SHOW EXPLAIN only contains
|
||||
@ -901,7 +921,7 @@ EXPLAIN SELECT a FROM t1 GROUP BY a;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 4112 Using temporary; Using filesort
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
SELECT a FROM t1 GROUP BY a;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -925,7 +945,7 @@ a
|
||||
14
|
||||
15
|
||||
16
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
drop table t1;
|
||||
#
|
||||
# MDEV-408: SHOW EXPLAIN: Some values are chopped off in SHOW EXPLAIN output
|
||||
@ -939,7 +959,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
|
||||
2 DEPENDENT SUBQUERY t2 index_subquery PRIMARY,c c 5 func 1 Using index; Using where
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
SELECT SUM(a + SLEEP(0.1)) FROM t1 WHERE a IN ( SELECT c FROM t2 WHERE d < b ) OR b < 's';
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -949,7 +969,7 @@ Warnings:
|
||||
Note 1003 SELECT SUM(a + SLEEP(0.1)) FROM t1 WHERE a IN ( SELECT c FROM t2 WHERE d < b ) OR b < 's'
|
||||
SUM(a + SLEEP(0.1))
|
||||
7862
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
drop table t1, t2;
|
||||
#
|
||||
# MDEV-412: SHOW EXPLAIN: Server crashes in JOIN::print_explain on a query with inner join and ORDER BY the same column twice
|
||||
@ -987,7 +1007,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 index b b 6 NULL 107 Using where; Using index
|
||||
1 SIMPLE t3 ref PRIMARY PRIMARY 5 test.t1.b 1 Using index
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_do_select';
|
||||
set debug_dbug='+d,show_explain_probe_do_select';
|
||||
SELECT b AS field1, b AS field2 FROM t1, t2, t3 WHERE d = b ORDER BY field1, field2;
|
||||
show explain for $thr2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -997,7 +1017,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
Warnings:
|
||||
Note 1003 SELECT b AS field1, b AS field2 FROM t1, t2, t3 WHERE d = b ORDER BY field1, field2
|
||||
field1 field2
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t1,t2,t3;
|
||||
#
|
||||
# MDEV-423: SHOW EXPLAIN: 'Using where' for a subquery is shown in EXPLAIN, but not in SHOW EXPLAIN output
|
||||
@ -1018,7 +1038,7 @@ id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t2 ALL NULL NULL NULL NULL 20
|
||||
3 SUBQUERY t3 ALL NULL NULL NULL NULL 20 Using where
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
SELECT max(a+b+c) FROM t1 AS alias1, ( SELECT * FROM t2 ) AS alias
|
||||
WHERE EXISTS ( SELECT * FROM t3 WHERE b = c ) OR a <= 10;
|
||||
show explain for $thr2;
|
||||
@ -1031,7 +1051,7 @@ Note 1003 SELECT max(a+b+c) FROM t1 AS alias1, ( SELECT * FROM t2 ) AS alias
|
||||
WHERE EXISTS ( SELECT * FROM t3 WHERE b = c ) OR a <= 10
|
||||
max(a+b+c)
|
||||
279
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
DROP TABLE t1,t2,t3;
|
||||
#
|
||||
# MDEV-416: Server crashes in SQL_SELECT::cleanup on EXPLAIN with SUM ( DISTINCT ) in a non-correlated subquery (5.5-show-explain tree)
|
||||
@ -1057,7 +1077,7 @@ select hex('
|
||||
hex('<27><>')
|
||||
E3FB
|
||||
set @show_explain_probe_select_id=1;
|
||||
set debug_dbug='d,show_explain_probe_join_exec_start';
|
||||
set debug_dbug='+d,show_explain_probe_join_exec_start';
|
||||
select * from t0 where length('<27><>') = a;
|
||||
set names utf8;
|
||||
show explain for $thr2;
|
||||
@ -1068,7 +1088,7 @@ Note 1003 select * from t0 where length('гы') = a
|
||||
set names default;
|
||||
a
|
||||
2
|
||||
set debug_dbug='';
|
||||
set debug_dbug=@old_debug;
|
||||
set names default;
|
||||
#
|
||||
# MDEV-462: SHOW EXPLAIN: Assertion `table_list->table' fails in find_field_in_table_ref if FOR contains a non-numeric value
|
||||
|
||||
@ -530,4 +530,9 @@ SELECT @a;
|
||||
@a
|
||||
1
|
||||
DROP TABLE t1;
|
||||
#
|
||||
# Check that used memory extends if we set a variable
|
||||
#
|
||||
set @var= repeat('a',20000);
|
||||
1
|
||||
End of 5.5 tests
|
||||
|
||||
Reference in New Issue
Block a user