bk commit into 5.1 tree (istruewing:1.2598) BUG#22351

[Ingo Struewing]

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ChangeSet@stripped, 2007-11-01 12:26:14+01:00, istruewing@stripped +1 -0
  Bug#22351 - handler::index_next_same() call to key_cmp_if_same() uses
              the wrong buffer
  
  handler::index_next_same() did not take into account that the
  internally called function key_cmp_if_same() uses the fixed
  buffer table->record[0] for key comparison instead of the
  buffer provided by the caller of handler::index_next_same().
  
  Added code to temporarily redirect table->record[0] to the
  record buffer provided by the caller of handler::index_next_same().
  
  The test case is in partition.test already.

  sql/handler.cc@stripped, 2007-11-01 12:26:13+01:00, istruewing@stripped +6 -1
    Bug#22351 - handler::index_next_same() call to key_cmp_if_same() uses
                the wrong buffer
    Added code to temporarily redirect table->record[0] to the
    record buffer provided by the caller of handler::index_next_same().

diff -Nrup a/sql/handler.cc b/sql/handler.cc
--- a/sql/handler.cc	2007-08-31 08:57:57 +02:00
+++ b/sql/handler.cc	2007-11-01 12:26:13 +01:00
@@ -2522,15 +2522,20 @@ int ha_enable_transaction(THD *thd, bool
 int handler::index_next_same(uchar *buf, const uchar *key, uint keylen)
 {
   int error;
+  DBUG_ENTER("index_next_same");
   if (!(error=index_next(buf)))
   {
+    /* key_cmp_if_same() compares table->record[0] against 'key'. */
+    uchar *save_record_0= table->record[0];
+    table->record[0]= buf;
     if (key_cmp_if_same(table, key, active_index, keylen))
     {
       table->status=STATUS_NOT_FOUND;
       error=HA_ERR_END_OF_FILE;
     }
+    table->record[0]= save_record_0;
   }
-  return error;
+  DBUG_RETURN(error);
 }