diff --git a/pkg/util/ranger/detacher.go b/pkg/util/ranger/detacher.go
index 2d414204cf242..dd000e0931b1a 100644
--- a/pkg/util/ranger/detacher.go
+++ b/pkg/util/ranger/detacher.go
@@ -645,7 +645,7 @@ func allEqOrIn(expr expression.Expression) bool {
 			}
 		}
 		return true
-	case ast.EQ, ast.NullEQ, ast.In:
+	case ast.EQ, ast.NullEQ, ast.In, ast.IsNull::
 		return true
 	}
 	return false