Filters for distinct()

sqlaload/query.py

@@ -58,9 +58,18 @@ def query(engine, query):
     for res in resultiter(engine.execute(query)):
         yield res
 
-def distinct(engine, table, *columns):
+def distinct(engine, table, *columns, **kw):
     columns = [table.c[c] for c in columns]
+
+    qargs = []
+    try:
+        for col, val in kw.items():
+            qargs.append(table.c[col]==val)
+    except KeyError:
+        return
+
     q = expression.select(columns, distinct=True,
+            whereclause=and_(*qargs),
             order_by=[c.asc() for c in columns])
     return list(resultiter(engine.execute(q)))