Bug#20209756 MYSQL CRASHED BECAUSE OF APPEND OPERATION

This bug is caused by trying to do "append" on a integer column. We should
block this operation.

Reviewed-by: Jimmy Yang<jimmy.yang@oracle.com>
RB: 7804

Author: Allen.Lai

plugin/innodb_memcached/innodb_memcache/src/innodb_api.c

@@ -1,6 +1,6 @@
 /***********************************************************************
 
-Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
+Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
 
 This program is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the
@@ -1488,9 +1488,19 @@ innodb_api_link(
 			column_used = 0;
 		}
 
+		/* For int column, we don't support append command. */
+		if (append && !result->extra_col_value[column_used].is_str) {
+			return DB_UNSUPPORTED;
+		}
+
 		before_len = result->extra_col_value[column_used].value_len;
 		before_val = result->extra_col_value[column_used].value_str;
 	} else {
+		/* For int column, we don't support append command. */
+		if (append && !result->col_value[MCI_COL_VALUE].is_str) {
+			return DB_UNSUPPORTED;
+		}
+
 		before_len = result->col_value[MCI_COL_VALUE].value_len;
 		before_val = result->col_value[MCI_COL_VALUE].value_str;
 		column_used = UPDATE_ALL_VAL_COL;