@@ -433,7 +433,7 @@ class (KnownSymbol table, KnownSymbol column)
433433 getGroup2 table column = UnsafeExpression $
434434 renderAlias table <> "." <> renderAlias column
435435instance {-# OVERLAPPING #-} (KnownSymbol table, KnownSymbol column)
436− => GroupedBy table column '[ '(table,column)]
436+ => GroupedBy table column ('(table,column) ': bys)
437437instance {-# OVERLAPPABLE #-}
438438 ( KnownSymbol table
439439 , KnownSymbol column