Merge sanja.is.com.ua:/home/bell/mysql/bk/mysql-4.1

into  sanja.is.com.ua:/home/bell/mysql/bk/work-merge1-5.0


configure.in:
  merge
mysql-test/r/query_cache.result:
  merge
mysql-test/t/query_cache.test:
  merge
sql/sql_cache.cc:
  merge

1 files changed, 24 insertions, 14 deletions

diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc
index 24ab27c587d..0a01832bb39 100644
--- a/sql/sql_cache.cc
+++ b/sql/sql_cache.cc
@@ -977,21 +977,31 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
     goto err;
   }
 
-  /*
-    Test if the query is a SELECT
-    (pre-space is removed in dispatch_command).
-
-    First '/' looks like comment before command it is not
-    frequently appeared in real lihe, consequently we can
-    check all such queries, too.
-  */
-  if ((my_toupper(system_charset_info, sql[0]) != 'S' || 
-       my_toupper(system_charset_info, sql[1]) != 'E' ||
-       my_toupper(system_charset_info,sql[2]) !='L') &&
-      sql[0] != '/')
   {
-    DBUG_PRINT("qcache", ("The statement is not a SELECT; Not cached"));
-    goto err;
+    uint i= 0;
+    /*
+      Skip '(' characters in queries like following:
+      (select a from t1) union (select a from t1);
+    */
+    while (sql[i]=='(')
+      i++;
+
+    /*
+      Test if the query is a SELECT
+      (pre-space is removed in dispatch_command)
+
+      First '/' looks like comment before command it is not
+      frequently appeared in real lihe, consequently we can
+      check all such queries, too.
+    */
+    if ((my_toupper(system_charset_info, sql[i])     != 'S' ||
+         my_toupper(system_charset_info, sql[i + 1]) != 'E' ||
+         my_toupper(system_charset_info, sql[i + 2]) != 'L') &&
+        sql[i] != '/')
+    {
+      DBUG_PRINT("qcache", ("The statement is not a SELECT; Not cached"));
+      goto err;
+    }
   }
 
   STRUCT_LOCK(&structure_guard_mutex);