Added to Aria better hash for packed numeric data for unique handling.

This was needed as the old code caused us to have LOTS of duplicate
hash values when used by optimizer.

include/m_ctype.h:
  Made my_hash_sort_bin() exernal
storage/maria/ma_unique.c:
  Better hash for packed numeric data for unique handling.
  This was needed as the old code caused us to have LOTS
  of duplicate hash values when used by optimizer.

include/m_ctype.h

@@ -357,6 +357,9 @@ extern int  my_strnncollsp_simple(CHARSET_INFO *, const uchar *, size_t,
 extern void my_hash_sort_simple(CHARSET_INFO *cs,
 				const uchar *key, size_t len,
 				ulong *nr1, ulong *nr2); 
+extern void my_hash_sort_bin(CHARSET_INFO *cs,
+                             const uchar *key, size_t len, ulong *nr1,
+                             ulong *nr2);
 
 extern size_t my_lengthsp_8bit(CHARSET_INFO *cs, const char *ptr, size_t length);
 

storage/maria/ma_unique.c

@@ -134,13 +134,14 @@ ha_checksum _ma_unique_hash(MARIA_UNIQUEDEF *def, const uchar *record)
       keyseg->charset->coll->hash_sort(keyseg->charset,
                                        (const uchar*) pos, length, &seed1,
                                        &seed2);
-      crc^= seed1;
+      crc+= seed1;
     }
     else
-      while (pos != end)
-	crc=((crc << 8) +
-	     (((uchar)  *pos++))) +
-	  (crc >> (8*sizeof(ha_checksum)-8));
+    {
+      my_hash_sort_bin((CHARSET_INFO*) 0, pos, (size_t) (end-pos),
+                       &seed1, &seed2);
+      crc+= seed1;
+    }
   }
   return crc;
 }