bk commit into 5.0 tree (gkodinov:1.2425) BUG#26537

[kgeorge]

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ChangeSet@stripped, 2007-03-02 12:14:50+02:00, gkodinov@stripped +3 -0
  Bug #26537: item_unhex() was not expected 
  to return NULL for non-NULL arguments.
  This is not the case as it can return NULL
  for invalid hexidecimal strings.
  Fixed by setting the maybe_null flag.

  mysql-test/r/func_str.result@stripped, 2007-03-02 12:14:49+02:00, gkodinov@stripped +6 -0
    Bug #26537: test case

  mysql-test/t/func_str.test@stripped, 2007-03-02 12:14:49+02:00, gkodinov@stripped +6 -0
    Bug #26537: test case

  sql/item_strfunc.h@stripped, 2007-03-02 12:14:49+02:00, gkodinov@stripped +5 -1
    Bug #26537: item_unhex() can return NULLs
    even for guaranteed non-null arguments.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	gkodinov
# Host:	magare.gmz
# Root:	/home/kgeorge/mysql/work/B26537-5.0-opt

--- 1.120/sql/item_strfunc.h	2007-01-12 15:40:31 +02:00
+++ 1.121/sql/item_strfunc.h	2007-03-02 12:14:49 +02:00
@@ -605,7 +605,11 @@
 {
   String tmp_value;
 public:
-  Item_func_unhex(Item *a) :Item_str_func(a) {}
+  Item_func_unhex(Item *a) :Item_str_func(a) 
+  { 
+    /* there can be bad hex strings */
+    maybe_null= 1; 
+  }
   const char *func_name() const { return "unhex"; }
   String *val_str(String *);
   void fix_length_and_dec()

--- 1.126/mysql-test/r/func_str.result	2007-01-12 16:34:59 +02:00
+++ 1.127/mysql-test/r/func_str.result	2007-03-02 12:14:49 +02:00
@@ -1940,4 +1940,10 @@
 select lpad('abc', cast(5 as unsigned integer), 'x');
 lpad('abc', cast(5 as unsigned integer), 'x')
 xxabc
+SELECT UNHEX('G');
+UNHEX('G')
+NULL
+SELECT UNHEX('G') IS NULL;
+UNHEX('G') IS NULL
+1
 End of 5.0 tests

--- 1.99/mysql-test/t/func_str.test	2007-01-12 15:40:31 +02:00
+++ 1.100/mysql-test/t/func_str.test	2007-03-02 12:14:49 +02:00
@@ -1008,4 +1008,10 @@
 select rpad('abc', cast(5 as unsigned integer), 'x');
 select lpad('abc', cast(5 as unsigned integer), 'x');
 
+#
+# Bug #26537: UNHEX() IS NULL comparison fails
+#
+SELECT UNHEX('G');
+SELECT UNHEX('G') IS NULL;
+
 --echo End of 5.0 tests