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Add a counter for the number of select statements using window functions

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The counter is available via SHOW [GLOBAL] STATUS and will be reported
by the feedback plugin.
This commit is contained in:
Vicențiu Ciorbaru
2016-09-19 20:45:30 +02:00
parent 5cb568786a
commit 62df3119a5
3 changed files with 4 additions and 0 deletions
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1
sql/mysqld.cc
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@ -8411,6 +8411,7 @@ SHOW_VAR status_vars[]= {
{"Feature_subquery", (char*) offsetof(STATUS_VAR, feature_subquery), SHOW_LONG_STATUS},
{"Feature_timezone", (char*) offsetof(STATUS_VAR, feature_timezone), SHOW_LONG_STATUS},
{"Feature_trigger", (char*) offsetof(STATUS_VAR, feature_trigger), SHOW_LONG_STATUS},
{"Feature_window_functions", (char*) offsetof(STATUS_VAR, feature_window_functions), SHOW_LONG_STATUS},
{"Feature_xml", (char*) offsetof(STATUS_VAR, feature_xml), SHOW_LONG_STATUS},
{"Flush_commands", (char*) &show_flush_commands, SHOW_SIMPLE_FUNC},
{"Handler_commit", (char*) offsetof(STATUS_VAR, ha_commit_count), SHOW_LONG_STATUS},

1
sql/sql_class.h
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@ -789,6 +789,7 @@ typedef struct system_status_var
ulong feature_timezone; /* +1 when XPATH is used */
ulong feature_trigger; /* +1 opening a table with triggers */
ulong feature_xml; /* +1 when XPATH is used */
ulong feature_window_functions; /* +1 when window functions are used */
/* From MASTER_GTID_WAIT usage */
ulonglong master_gtid_wait_timeouts; /* Number of timeouts */

2
sql/sql_select.cc
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@ -2699,6 +2699,8 @@ bool JOIN::make_aggr_tables_info()
if (curr_tab->window_funcs_step->setup(thd, &select_lex->window_funcs,
curr_tab))
DBUG_RETURN(true);
/* Count that we're using window functions. */
status_var_increment(thd->status_var.feature_window_functions);
}
fields= curr_fields_list;