MDEV-17320 add Feature_application_time_periods status variable

Closes #1225

mysql-test/main/features.result

@@ -3,6 +3,7 @@ set sql_mode="";
 flush status;
 show status like "feature%";
 Variable_name	Value
+Feature_application_time_periods	0
 Feature_check_constraint	0
 Feature_custom_aggregate_functions	0
 Feature_delay_key_write	0

mysql-test/suite/period/r/create.result

@@ -93,4 +93,7 @@ t	CREATE TABLE `t` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 insert t values (2, '2001-01-01', '2001-01-01');
 ERROR 23000: CONSTRAINT `mytime_1` failed for `test`.`t`
+show status like "Feature_application_time_periods";
+Variable_name	Value
+Feature_application_time_periods	6
 create or replace database test;

mysql-test/suite/period/t/create.test

@@ -77,4 +77,6 @@ show create table t;
 --error ER_CONSTRAINT_FAILED
 insert t values (2, '2001-01-01', '2001-01-01');
 
+show status like "Feature_application_time_periods";
+
 create or replace database test;

sql/mysqld.cc

@@ -7666,6 +7666,7 @@ SHOW_VAR status_vars[]= {
   {"Feature_locale",           (char*) offsetof(STATUS_VAR, feature_locale), SHOW_LONG_STATUS},
   {"Feature_subquery",         (char*) offsetof(STATUS_VAR, feature_subquery), SHOW_LONG_STATUS},
   {"Feature_system_versioning",   (char*) offsetof(STATUS_VAR, feature_system_versioning), SHOW_LONG_STATUS},
+  {"Feature_application_time_periods", (char*) offsetof(STATUS_VAR, feature_application_time_periods), 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},

sql/sql_class.h

@@ -862,6 +862,8 @@ typedef struct system_status_var
   ulong feature_locale;		    /* +1 when LOCALE is set */
   ulong feature_subquery;	    /* +1 when subqueries are used */
   ulong feature_system_versioning;  /* +1 opening a table WITH SYSTEM VERSIONING */
+  ulong feature_application_time_periods;
+                                    /* +1 opening a table with application-time period */
   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 */

sql/table.cc

@@ -2108,6 +2108,7 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
 
     if (init_period_from_extra2(&period, pos, end))
       goto err;
+    status_var_increment(thd->status_var.feature_application_time_periods);
   }
 
   for (i=0 ; i < share->fields; i++, strpos+=field_pack_length, field_ptr++)