information about different variables agged to query cache (BUG#5515, BUG#5394)

mysql-test/r/query_cache.result

@@ -851,4 +851,60 @@ select @@character_set_results;
 @@character_set_results
 NULL
 set character_set_results=default;
+set GLOBAL query_cache_size=1355776;
+create table t1 (id int auto_increment primary key, c char(25));
+insert into t1 set c = repeat('x',24);
+insert into t1 set c = concat(repeat('x',24),'x');
+insert into t1 set c = concat(repeat('x',24),'w');
+insert into t1 set c = concat(repeat('x',24),'y');
+set max_sort_length=200;
+select c from t1 order by c, id;
+c
+xxxxxxxxxxxxxxxxxxxxxxxx
+xxxxxxxxxxxxxxxxxxxxxxxxw
+xxxxxxxxxxxxxxxxxxxxxxxxx
+xxxxxxxxxxxxxxxxxxxxxxxxy
+reset query cache;
+set max_sort_length=20;
+select c from t1 order by c, id;
+c
+xxxxxxxxxxxxxxxxxxxxxxxx
+xxxxxxxxxxxxxxxxxxxxxxxxx
+xxxxxxxxxxxxxxxxxxxxxxxxw
+xxxxxxxxxxxxxxxxxxxxxxxxy
+set max_sort_length=200;
+select c from t1 order by c, id;
+c
+xxxxxxxxxxxxxxxxxxxxxxxx
+xxxxxxxxxxxxxxxxxxxxxxxxw
+xxxxxxxxxxxxxxxxxxxxxxxxx
+xxxxxxxxxxxxxxxxxxxxxxxxy
+set max_sort_length=default;
+select '1' || '3' from t1;
+'1' || '3'
+1
+1
+1
+1
+set SQL_MODE=oracle;
+select '1' || '3' from t1;
+'1' || '3'
+13
+13
+13
+13
+set SQL_MODE=default;
+drop table t1;
+create table t1 (a varchar(20), b int);
+insert into t1 values ('12345678901234567890', 1);
+set group_concat_max_len=10;
+select group_concat(a) FROM t1 group by b;
+group_concat(a)
+1234567890
+set group_concat_max_len=1024;
+select group_concat(a) FROM t1 group by b;
+group_concat(a)
+12345678901234567890
+set group_concat_max_len=default;
+drop table t1;
 SET GLOBAL query_cache_size=0;

mysql-test/t/query_cache.test

@@ -627,4 +627,38 @@ set character_set_results=null;
 select @@character_set_results;
 set character_set_results=default;
 
+#
+# query cache and environment variables
+#
+# max_sort_length
+set GLOBAL query_cache_size=1355776;
+create table t1 (id int auto_increment primary key, c char(25));
+insert into t1 set c = repeat('x',24);
+insert into t1 set c = concat(repeat('x',24),'x');
+insert into t1 set c = concat(repeat('x',24),'w');
+insert into t1 set c = concat(repeat('x',24),'y');
+set max_sort_length=200;   
+select c from t1 order by c, id;
+reset query cache;
+set max_sort_length=20;
+select c from t1 order by c, id;
+set max_sort_length=200;   
+select c from t1 order by c, id;
+set max_sort_length=default;
+# sql_mode
+select '1' || '3' from t1;
+set SQL_MODE=oracle;
+select '1' || '3' from t1;
+set SQL_MODE=default;
+drop table t1;
+# group_concat_max_len
+create table t1 (a varchar(20), b int);
+insert into t1 values ('12345678901234567890', 1);
+set group_concat_max_len=10;
+select group_concat(a) FROM t1 group by b;
+set group_concat_max_len=1024;
+select group_concat(a) FROM t1 group by b;
+set group_concat_max_len=default;
+drop table t1;
+
 SET GLOBAL query_cache_size=0;

sql/mysql_priv.h

@@ -390,6 +390,9 @@ struct Query_cache_query_flags
   uint collation_connection_num;
   ha_rows limit;
   Time_zone *time_zone;
+  ulong sql_mode;
+  ulong max_sort_length;
+  ulong group_concat_max_len;
 };
 #define QUERY_CACHE_FLAGS_SIZE sizeof(Query_cache_query_flags)
 #include "sql_cache.h"

sql/sql_cache.cc

@@ -787,6 +787,9 @@ void Query_cache::store_query(THD *thd, TABLE_LIST *tables_used)
       thd->variables.collation_connection->number;
     flags.limit= thd->variables.select_limit;
     flags.time_zone= thd->variables.time_zone;
+    flags.sql_mode= thd->variables.sql_mode;
+    flags.max_sort_length= thd->variables.max_sort_length;
+    flags.group_concat_max_len= thd->variables.group_concat_max_len;
     STRUCT_LOCK(&structure_guard_mutex);
 
     if (query_cache_size == 0)
@@ -974,8 +977,11 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
   flags.collation_connection_num= thd->variables.collation_connection->number;
   flags.limit= thd->variables.select_limit;
   flags.time_zone= thd->variables.time_zone;
+  flags.sql_mode= thd->variables.sql_mode;
+  flags.max_sort_length= thd->variables.max_sort_length;
+  flags.group_concat_max_len= thd->variables.group_concat_max_len;
   memcpy((void *)(sql + (tot_length - QUERY_CACHE_FLAGS_SIZE)),
- 	 &flags, QUERY_CACHE_FLAGS_SIZE);
+	 &flags, QUERY_CACHE_FLAGS_SIZE);
   query_block = (Query_cache_block *)  hash_search(&queries, (byte*) sql,
 						   tot_length);
   /* Quick abort on unlocked data */

sql/sql_cache.h

@@ -53,10 +53,6 @@
    of list of free blocks */
 #define QUERY_CACHE_MEM_BIN_TRY                 5
 
-/* query flags masks */
-#define QUERY_CACHE_CLIENT_LONG_FLAG_MASK	0x80
-#define QUERY_CACHE_CHARSET_CONVERT_MASK	0x7F
-
 /* packing parameters */
 #define QUERY_CACHE_PACK_ITERATION		2
 #define QUERY_CACHE_PACK_LIMIT			(512*1024L)