Added HITS column to QUERY_CACHE_INFO table

Updated qc_info tests, added new test that checks HITS is incremented.

mysql-test/suite/plugins/r/qc_info.result

@@ -26,15 +26,29 @@ set time_zone=@new_time_zone,default_week_format=4,character_set_client='binary'
 select * from t1;
 set time_zone= @time_zone, default_week_format= @default_week_format, character_set_client= @character_set_client,character_set_results= @character_set_results, sql_mode= @sql_mode, div_precision_increment= @div_precision_increment, lc_time_names= @lc_time_names, autocommit= @autocommit, group_concat_max_len= @group_concat_max_len, max_sort_length= @max_sort_length;
 select * from information_schema.query_cache_info;
-STATEMENT_SCHEMA	STATEMENT_TEXT	RESULT_BLOCKS_COUNT	RESULT_BLOCKS_SIZE	RESULT_BLOCKS_SIZE_USED	LIMIT	MAX_SORT_LENGTH	GROUP_CONCAT_MAX_LENGTH	CHARACTER_SET_CLIENT	CHARACTER_SET_RESULT	COLLATION	TIMEZONE	DEFAULT_WEEK_FORMAT	DIV_PRECISION_INCREMENT	SQL_MODE	LC_TIME_NAMES	CLIENT_LONG_FLAG	CLIENT_PROTOCOL_41	PROTOCOL_TYPE	MORE_RESULTS_EXISTS	IN_TRANS	AUTOCOMMIT	PACKET_NUMBER
-test	select * from t1	1	512	#	-1	1011	513	binary	utf32	utf32_bin	Europe/Moscow	4	7	STRICT_ALL_TABLES	ar_SD	1	1	#	0	0	0	#
-test	select * from t1	1	512	#	-1	1024	1048576	latin1	latin1	latin1_swedish_ci	SYSTEM	0	4	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	en_US	1	1	#	0	0	1	#
+STATEMENT_SCHEMA	STATEMENT_TEXT	RESULT_BLOCKS_COUNT	RESULT_BLOCKS_SIZE	RESULT_BLOCKS_SIZE_USED	LIMIT	MAX_SORT_LENGTH	GROUP_CONCAT_MAX_LENGTH	CHARACTER_SET_CLIENT	CHARACTER_SET_RESULT	COLLATION	TIMEZONE	DEFAULT_WEEK_FORMAT	DIV_PRECISION_INCREMENT	SQL_MODE	LC_TIME_NAMES	CLIENT_LONG_FLAG	CLIENT_PROTOCOL_41	PROTOCOL_TYPE	MORE_RESULTS_EXISTS	IN_TRANS	AUTOCOMMIT	PACKET_NUMBER	HITS
+test	select * from t1	1	512	#	-1	1011	513	binary	utf32	utf32_bin	Europe/Moscow	4	7	STRICT_ALL_TABLES	ar_SD	1	1	#	0	0	0	#	0
+test	select * from t1	1	512	#	-1	1024	1048576	latin1	latin1	latin1_swedish_ci	SYSTEM	0	4	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	en_US	1	1	#	0	0	1	#	0
+reset query cache;
+select * from t1;
+a
+1
+2
+3
+select * from t1;
+a
+1
+2
+3
+select hits, statement_text from information_schema.query_cache_info;
+hits	statement_text
+1	select * from t1
 drop table t1;
 select statement_schema, statement_text, result_blocks_count, result_blocks_size from information_schema.query_cache_info;
 statement_schema	statement_text	result_blocks_count	result_blocks_size
 set global query_cache_size = 0;
 select * from information_schema.query_cache_info;
-STATEMENT_SCHEMA	STATEMENT_TEXT	RESULT_BLOCKS_COUNT	RESULT_BLOCKS_SIZE	RESULT_BLOCKS_SIZE_USED	LIMIT	MAX_SORT_LENGTH	GROUP_CONCAT_MAX_LENGTH	CHARACTER_SET_CLIENT	CHARACTER_SET_RESULT	COLLATION	TIMEZONE	DEFAULT_WEEK_FORMAT	DIV_PRECISION_INCREMENT	SQL_MODE	LC_TIME_NAMES	CLIENT_LONG_FLAG	CLIENT_PROTOCOL_41	PROTOCOL_TYPE	MORE_RESULTS_EXISTS	IN_TRANS	AUTOCOMMIT	PACKET_NUMBER
+STATEMENT_SCHEMA	STATEMENT_TEXT	RESULT_BLOCKS_COUNT	RESULT_BLOCKS_SIZE	RESULT_BLOCKS_SIZE_USED	LIMIT	MAX_SORT_LENGTH	GROUP_CONCAT_MAX_LENGTH	CHARACTER_SET_CLIENT	CHARACTER_SET_RESULT	COLLATION	TIMEZONE	DEFAULT_WEEK_FORMAT	DIV_PRECISION_INCREMENT	SQL_MODE	LC_TIME_NAMES	CLIENT_LONG_FLAG	CLIENT_PROTOCOL_41	PROTOCOL_TYPE	MORE_RESULTS_EXISTS	IN_TRANS	AUTOCOMMIT	PACKET_NUMBER	HITS
 set global query_cache_size= default;
 set global query_cache_type=default;
 show query_cache_info;

mysql-test/suite/plugins/r/qc_info_priv.result

@@ -26,9 +26,9 @@ set time_zone=@new_time_zone,default_week_format=4,character_set_client='binary'
 select * from t1;
 set time_zone= @time_zone, default_week_format= @default_week_format, character_set_client= @character_set_client,character_set_results= @character_set_results, sql_mode= @sql_mode, div_precision_increment= @div_precision_increment, lc_time_names= @lc_time_names, autocommit= @autocommit, group_concat_max_len= @group_concat_max_len, max_sort_length= @max_sort_length;
 select * from information_schema.query_cache_info;
-STATEMENT_SCHEMA	STATEMENT_TEXT	RESULT_BLOCKS_COUNT	RESULT_BLOCKS_SIZE	RESULT_BLOCKS_SIZE_USED	LIMIT	MAX_SORT_LENGTH	GROUP_CONCAT_MAX_LENGTH	CHARACTER_SET_CLIENT	CHARACTER_SET_RESULT	COLLATION	TIMEZONE	DEFAULT_WEEK_FORMAT	DIV_PRECISION_INCREMENT	SQL_MODE	LC_TIME_NAMES	CLIENT_LONG_FLAG	CLIENT_PROTOCOL_41	PROTOCOL_TYPE	MORE_RESULTS_EXISTS	IN_TRANS	AUTOCOMMIT	PACKET_NUMBER
-test	select * from t1	1	512	#	-1	1011	513	binary	utf32	utf32_bin	Europe/Moscow	4	7	STRICT_ALL_TABLES	ar_SD	1	1	#	0	0	0	#
-test	select * from t1	1	512	#	-1	1024	1048576	latin1	latin1	latin1_swedish_ci	SYSTEM	0	4	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	en_US	1	1	#	0	0	1	#
+STATEMENT_SCHEMA	STATEMENT_TEXT	RESULT_BLOCKS_COUNT	RESULT_BLOCKS_SIZE	RESULT_BLOCKS_SIZE_USED	LIMIT	MAX_SORT_LENGTH	GROUP_CONCAT_MAX_LENGTH	CHARACTER_SET_CLIENT	CHARACTER_SET_RESULT	COLLATION	TIMEZONE	DEFAULT_WEEK_FORMAT	DIV_PRECISION_INCREMENT	SQL_MODE	LC_TIME_NAMES	CLIENT_LONG_FLAG	CLIENT_PROTOCOL_41	PROTOCOL_TYPE	MORE_RESULTS_EXISTS	IN_TRANS	AUTOCOMMIT	PACKET_NUMBER	HITS
+test	select * from t1	1	512	#	-1	1011	513	binary	utf32	utf32_bin	Europe/Moscow	4	7	STRICT_ALL_TABLES	ar_SD	1	1	#	0	0	0	#	0
+test	select * from t1	1	512	#	-1	1024	1048576	latin1	latin1	latin1_swedish_ci	SYSTEM	0	4	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	en_US	1	1	#	0	0	1	#	0
 create user mysqltest;
 connect  conn1,localhost,mysqltest,,;
 connection conn1;

mysql-test/suite/plugins/t/qc_info.test

 --source qc_info_init.inc
 
+# test that hits are correctly incremented
+reset query cache;
+select * from t1;
+select * from t1;
+select hits, statement_text from information_schema.query_cache_info;
+
 drop table t1;
 # the query was invalidated
 select statement_schema, statement_text, result_blocks_count, result_blocks_size from information_schema.query_cache_info;

plugin/qc_info/qc_info.cc

@@ -77,6 +77,7 @@ bool schema_table_store_record(THD *thd, TABLE *table);
 #define COLUMN_IN_TRANS 20
 #define COLUMN_AUTOCOMMIT 21
 #define COLUMN_PKT_NR 22
+#define COLUMN_HITS 23
 
 /* ST_FIELD_INFO is defined in table.h */
 static ST_FIELD_INFO qc_info_fields[]=
@@ -104,6 +105,7 @@ static ST_FIELD_INFO qc_info_fields[]=
   {"IN_TRANS", MY_INT32_NUM_DECIMAL_DIGITS, MYSQL_TYPE_TINY, 0, 0, 0, 0},
   {"AUTOCOMMIT", MY_INT32_NUM_DECIMAL_DIGITS, MYSQL_TYPE_TINY, 0, 0, 0, 0},
   {"PACKET_NUMBER", MY_INT32_NUM_DECIMAL_DIGITS, MYSQL_TYPE_TINY, 0, 0, 0, 0},
+  {"HITS", MY_INT32_NUM_DECIMAL_DIGITS, MYSQL_TYPE_LONGLONG, 0, MY_I_S_UNSIGNED, 0, 0},
   {0, 0, MYSQL_TYPE_STRING, 0, 0, 0, 0}
 };
 
@@ -216,6 +218,7 @@ static int qc_info_fill_table(THD *thd, TABLE_LIST *tables,
     table->field[COLUMN_IN_TRANS]->store(flags.in_trans, 0);
     table->field[COLUMN_AUTOCOMMIT]->store(flags.autocommit, 0);
     table->field[COLUMN_PKT_NR]->store(flags.pkt_nr, 0);
+    table->field[COLUMN_HITS]->store(query_cache_query->hits(), 0);
 
     /* The database against which the statement is executed is part of the
        query cache query key