Fix "ORDER BY" expression part generated by fulltext operators.

This was always broken, and went unnoticed because of another breakage: these
expressions were never rendered in final SQL. That will be fixed in a separate
commit.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33653 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ZSQLCatalog/Operator/ComparisonOperator.py

@@ -119,7 +119,7 @@ class MatchComparisonOperator(MonovaluedComparisonOperator):
     # Sort on this column uses relevance.
     # TODO: Add a way to allow sorting by raw column value.
     order_by_dict = {
-      column: self.where_expression_format_string,
+      column: match_string,
     }
     return SQLExpression(
       self,