ignore order by in subquery

Author: daimor

sqlalchemy_iris/base.py

@@ -436,6 +436,14 @@ def translate_select_structure(self, select_stmt, **kwargs):
         else:
             return select
 
+    def order_by_clause(self, select, **kw):
+        order_by = self.process(select._order_by_clause, **kw)
+
+        if order_by and (not self.is_subquery() or select._limit):
+            return " ORDER BY " + order_by
+        else:
+            return ""
+
 
 class IRISDDLCompiler(sql.compiler.DDLCompiler):
     """IRIS syntactic idiosyncrasies"""