Merge maint1.mysql.com:/data/localhome/cmiller/bug15583/my50-bug15583

into  maint1.mysql.com:/data/localhome/cmiller/bug15583/my51-bug15583

mysql-test/r/type_bit.result

@@ -572,4 +572,34 @@ def	test	t1	t1	a	a	16	7	1	Y	0	0	63
 a
 `
 drop table t1;
+create table bug15583(b BIT(8), n INT);
+insert into bug15583 values(128, 128);
+insert into bug15583 values(null, null);
+insert into bug15583 values(0, 0);
+insert into bug15583 values(255, 255);
+select hex(b), bin(b), oct(b), hex(n), bin(n), oct(n) from bug15583;
+hex(b)	bin(b)	oct(b)	hex(n)	bin(n)	oct(n)
+80	10000000	200	80	10000000	200
+NULL	NULL	NULL	NULL	NULL	NULL
+0	0	0	0	0	0
+FF	11111111	377	FF	11111111	377
+select hex(b)=hex(n) as should_be_onetrue, bin(b)=bin(n) as should_be_onetrue, oct(b)=oct(n) as should_be_onetrue from bug15583;
+should_be_onetrue	should_be_onetrue	should_be_onetrue
+1	1	1
+NULL	NULL	NULL
+1	1	1
+1	1	1
+select hex(b + 0), bin(b + 0), oct(b + 0), hex(n), bin(n), oct(n) from bug15583;
+hex(b + 0)	bin(b + 0)	oct(b + 0)	hex(n)	bin(n)	oct(n)
+80	10000000	200	80	10000000	200
+NULL	NULL	NULL	NULL	NULL	NULL
+0	0	0	0	0	0
+FF	11111111	377	FF	11111111	377
+select conv(b, 10, 2), conv(b + 0, 10, 2) from bug15583;
+conv(b, 10, 2)	conv(b + 0, 10, 2)
+10000000	10000000
+NULL	NULL
+0	0
+11111111	11111111
+drop table bug15583;
 End of 5.0 tests

mysql-test/t/type_bit.test

@@ -238,4 +238,19 @@ select * from t1;
 --disable_metadata
 drop table t1;
 
+#
+# Bug#15583: BIN()/OCT()/CONV() do not work with BIT values
+#
+create table bug15583(b BIT(8), n INT);
+insert into bug15583 values(128, 128);
+insert into bug15583 values(null, null);
+insert into bug15583 values(0, 0);
+insert into bug15583 values(255, 255);
+select hex(b), bin(b), oct(b), hex(n), bin(n), oct(n) from bug15583;
+select hex(b)=hex(n) as should_be_onetrue, bin(b)=bin(n) as should_be_onetrue, oct(b)=oct(n) as should_be_onetrue from bug15583;
+select hex(b + 0), bin(b + 0), oct(b + 0), hex(n), bin(n), oct(n) from bug15583; 
+select conv(b, 10, 2), conv(b + 0, 10, 2) from bug15583;
+drop table bug15583;
+
+
 --echo End of 5.0 tests

sql/item_strfunc.cc

@@ -2359,17 +2359,33 @@ String *Item_func_conv::val_str(String *str)
       abs(to_base) > 36 || abs(to_base) < 2 ||
       abs(from_base) > 36 || abs(from_base) < 2 || !(res->length()))
   {
-    null_value=1;
-    return 0;
+    null_value= 1;
+    return NULL;
   }
-  null_value=0;
+  null_value= 0;
   unsigned_flag= !(from_base < 0);
+
+  if (args[0]->field_type() == MYSQL_TYPE_BIT) 
+  {
+    /* 
+     Special case: The string representation of BIT doesn't resemble the
+     decimal representation, so we shouldn't change it to string and then to
+     decimal. 
+    */
+    dec= args[0]->val_int();
+  }
+  else
+  {
     if (from_base < 0)
-    dec= my_strntoll(res->charset(),res->ptr(),res->length(),-from_base,&endptr,&err);
+      dec= my_strntoll(res->charset(), res->ptr(), res->length(),
+                       -from_base, &endptr, &err);
     else
-    dec= (longlong) my_strntoull(res->charset(),res->ptr(),res->length(),from_base,&endptr,&err);
-  ptr= longlong2str(dec,ans,to_base);
-  if (str->copy(ans,(uint32) (ptr-ans), default_charset()))
+      dec= (longlong) my_strntoull(res->charset(), res->ptr(), res->length(),
+                                   from_base, &endptr, &err);
+  }
+
+  ptr= longlong2str(dec, ans, to_base);
+  if (str->copy(ans, (uint32) (ptr-ans), default_charset()))
     return &my_empty_string;
   return str;
 }