bug#7284: strnxfrm returns different results for equal strings

2 files changed, 4 insertions, 13 deletions

diff --git a/sql/field.cc b/sql/field.cc
index e2c11cc7372..86073072a64 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -4393,8 +4393,7 @@ void Field_string::sort_string(char *to,uint length)
   uint tmp=my_strnxfrm(field_charset,
 		       (unsigned char *) to, length,
 		       (unsigned char *) ptr, field_length);
-  if (tmp < length)
-    field_charset->cset->fill(field_charset, to + tmp, length - tmp, ' ');
+  DBUG_ASSERT(tmp == length);
 }
 
 
@@ -4596,9 +4595,7 @@ void Field_varstring::sort_string(char *to,uint length)
 			  (uchar*) to, length,
 			  (uchar*) ptr+HA_KEY_BLOB_LENGTH,
 			  tot_length);
-  if (tot_length < length)
-    field_charset->cset->fill(field_charset, to+tot_length,length-tot_length,
-			      binary() ? (char) 0 : ' ');
+  DBUG_ASSERT(tot_length == length);
 }
 
 
@@ -5116,10 +5113,7 @@ void Field_blob::sort_string(char *to,uint length)
     blob_length=my_strnxfrm(field_charset,
                             (uchar*) to, length, 
                             (uchar*) blob, blob_length);
-    if (blob_length < length)
-      field_charset->cset->fill(field_charset, to+blob_length,
-				length-blob_length,
-				binary() ? (char) 0 : ' ');
+    DBUG_ASSERT(blob_length == length);
   }
 }
 
diff --git a/sql/filesort.cc b/sql/filesort.cc
index bd0de022fd4..cb377070aaa 100644
--- a/sql/filesort.cc
+++ b/sql/filesort.cc
@@ -622,10 +622,7 @@ static void make_sortkey(register SORTPARAM *param,
 	    }
 	    uint tmp_length=my_strnxfrm(cs,to,sort_field->length,
 					(unsigned char *) from, length);
-	    if (tmp_length < sort_field->length)
-	      cs->cset->fill(cs, (char*) to+tmp_length,
-			     sort_field->length-tmp_length,
-			     fill_char);
+            DBUG_ASSERT(tmp_length == sort_field->length);
           }
           else
           {