diff --git a/pql/ast.go b/pql/ast.go
index d3858b951..e93a2aaf5 100644
--- a/pql/ast.go
+++ b/pql/ast.go
@@ -791,19 +791,6 @@ func (c *Call) TranslateInfo(columnLabel, rowLabel string) (colKey, rowKey, fiel
 	}
 }
 
-// Writable returns true if call is mutable (e.g. can write new translation keys)
-func (c *Call) Writable() bool {
-	switch c.Name {
-	case "Set", "SetRowAttrs", "SetColumnAttrs", "SetBit":
-		return true
-	case "Not":
-		// to support queries like Not(Row(f="garbage"))
-		return true
-	default:
-		return false
-	}
-}
-
 func (c *Call) ArgString(key string) string {
 	value, ok := c.Args[key]
 	if !ok {