Add statistics usable for feedback plugin

Following status variables where added:

Feature_vector_index ; Incremented when reading a vector index from
                       a .frm file.

Author: montywi

mysql-test/main/features.result

@@ -20,6 +20,7 @@ Feature_subquery	0
 Feature_system_versioning	0
 Feature_timezone	0
 Feature_trigger	0
+Feature_vector_index	0
 Feature_window_functions	0
 Feature_xml	0
 #
@@ -209,3 +210,18 @@ show status like "feature_into_%";
 Variable_name	Value
 Feature_into_outfile	4
 Feature_into_variable	2
+#
+# Feature vector index
+#
+create table t1 (id int auto_increment primary key,
+u vector(5) not null, vector index (u));
+select * from t1;
+id	u
+select * from t1;
+id	u
+select * from t1;
+id	u
+show status like "Feature_vector_index";
+Variable_name	Value
+Feature_vector_index	2
+drop table t1;

mysql-test/main/features.test

@@ -166,3 +166,15 @@ drop table t1;
 --remove_file $MYSQLTEST_VARDIR/tmp/features_outfile.1
 --remove_file $MYSQLTEST_VARDIR/tmp/features_outfile.2
 show status like "feature_into_%";
+
+--echo #
+--echo # Feature vector index
+--echo #
+
+create table t1 (id int auto_increment primary key,
+  u vector(5) not null, vector index (u));
+select * from t1;
+select * from t1;
+select * from t1;
+show status like "Feature_vector_index";
+drop table t1;

sql/mysqld.cc

@@ -7629,6 +7629,7 @@ SHOW_VAR status_vars[]= {
   {"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_vector_index",     (char*) offsetof(STATUS_VAR, feature_vector_index), 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},
   {"Handler_commit",           (char*) offsetof(STATUS_VAR, ha_commit_count), SHOW_LONG_STATUS},

sql/sql_class.h

@@ -1028,6 +1028,7 @@ 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_vector_index;       /* +1 when open table with vector index */
   ulong feature_window_functions;   /* +1 when window functions are used */
   ulong feature_into_outfile;       /* +1 when INTO OUTFILE is used */
   ulong feature_into_variable;      /* +1 when INTO VARIABLE is used */

sql/table.cc

@@ -788,7 +788,8 @@ enum open_frm_error open_table_def(THD *thd, TABLE_SHARE *share, uint flags)
   DBUG_RETURN(share->error);
 }
 
-static bool create_key_infos(const uchar *strpos, const uchar *frm_image_end,
+static bool create_key_infos(THD *thd, const uchar *strpos,
+                             const uchar *frm_image_end,
                              uint keys, KEY *keyinfo, uint new_frm_ver,
                              uint *ext_key_parts, TABLE_SHARE *share, uint len,
                              KEY *first_keyinfo, LEX_STRING *keynames)
@@ -845,6 +846,8 @@ static bool create_key_infos(const uchar *strpos, const uchar *frm_image_end,
       keyinfo->algorithm= HA_KEY_ALG_UNDEF;
       strpos+=4;
     }
+    if (keyinfo->algorithm == HA_KEY_ALG_VECTOR)
+      thd->status_var.feature_vector_index++;
 
     if (i == 0)
     {
@@ -2100,7 +2103,7 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
     share->set_use_ext_keys_flag(plugin_hton(se_plugin)->flags &
                                  HTON_SUPPORTS_EXTENDED_KEYS);
 
-    if (create_key_infos(disk_buff + 6, frm_image_end, keys, keyinfo,
+    if (create_key_infos(thd, disk_buff + 6, frm_image_end, keys, keyinfo,
                          new_frm_ver, &ext_key_parts,
                          share, len, &first_keyinfo, &keynames))
       goto err;
@@ -2200,7 +2203,7 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
   }
   else
   {
-    if (create_key_infos(disk_buff + 6, frm_image_end, keys, keyinfo,
+    if (create_key_infos(thd, disk_buff + 6, frm_image_end, keys, keyinfo,
                          new_frm_ver, &ext_key_parts,
                          share, len, &first_keyinfo, &keynames))
       goto err;