Merge a change from MySQL AB:

ChangeSet@1.2528.116.42  2007-09-08 20:26:12-07:00  antony@xiphis.org

Bug#30919
  "Rows not deleted from innodb partitioned tables if
  --innodb_autoinc_lock_mode=0"

  Due to a previous bugfix which initializes a previously uninitialized
  variable, ha_partition::get_auto_increment() may fail to operate
  correctly when the storage engine reports that it is only reserving
  one value and one or more partitions have a different 'next-value'.
  Currently, only affects Innodb's new-style auto-increment code which
  reserves larger blocks of values and has less inter-thread contention.

ha_innodb.cc:
Bug30919
  Only set *first_value if it is less than autoinc value. This allows
  a higher value to be hinted when operating as a partitioned table.

handler/ha_innodb.cc

@@ -7367,10 +7367,10 @@ ha_innobase::get_auto_increment(
 			trx->n_autoinc_rows = 1;
 		}
 
-		*first_value = autoinc;
+		set_if_bigger(*first_value, autoinc);
 	/* Not in the middle of a mult-row INSERT. */
 	} else if (prebuilt->last_value == 0) {
-		*first_value = autoinc;
+		set_if_bigger(*first_value, autoinc);
 	}
 
 	*nb_reserved_values = trx->n_autoinc_rows;