Bug #26 point(subselect(...)..)

• Submitted: 8 Jan 2003 16:59
• Modified: 16 Dec 2003 1:48
• Reporter: Alexey Botchkov
• Status: Closed
• Category: MySQL Server: MyISAM storage engine
• Severity: S3 (Non-critical)
• Version: 4.1
• Assigned to: Alexey Botchkov
• CPU Architecture: Any

[8 Jan 2003 16:59] Alexey Botchkov

Description:
mysql> insert into a (a) values (point(1, (select a from b)));
ERROR 2013: Lost connection to MySQL server during query

How to repeat:
mysql> drop table a;
Query OK, 0 rows affected (0.00 sec)

mysql> create table a (a blob, spatial key(a));
Query OK, 0 rows affected (0.00 sec)

mysql> create table b (a int);
Query OK, 0 rows affected (0.01 sec)

mysql> insert into b values (1);
Query OK, 1 row affected (0.03 sec)

mysql> insert into a (a) values (point(1,1));
Query OK, 1 row affected (0.02 sec)

mysql> insert into a (a) values (point(1, (select a from b)));
ERROR 2013: Lost connection to MySQL server during query

Suggested fix:
Here is the patch
--- 1.78/sql/item_strfunc.cc Thu Jan  2 19:03:58 2003
+++ 1.79/sql/item_strfunc.cc Wed Jan  8 19:41:38 2003
@@ -2666,6 +2666,9 @@
 
 String *Item_func_point::val_str(String *str)
 {
+  double x= args[0]->val();
+  double y= args[1]->val();
+
   if ( (null_value = (args[0]->null_value ||
                      args[1]->null_value ||
                      str->realloc(1+4+8+8))))
@@ -2674,8 +2677,8 @@
   str->length(0);
   str->q_append((char)Geometry::wkbNDR);
   str->q_append((uint32)Geometry::wkbPoint);
-  str->q_append((double)args[0]->val());
-  str->q_append((double)args[1]->val());
+  str->q_append(x);
+  str->q_append(y);
   return str;
 }
 
@@ -2707,10 +2710,9 @@
 
   for (i = 0; i < arg_count; ++i)
   {
+    String *res = args[i]->val_str(&arg_value);
     if (args[i]->null_value)
       goto ret;
-
-    String *res = args[i]->val_str(&arg_value);
 
     if ( coll_type == Geometry::wkbGeometryCollection )
     {

[8 Jan 2003 17:00] MySQL Developer

Thank you for your bug report. This issue has already been fixed
in the latest released version of that product, which you can download at 
http://www.mysql.com/downloads/