diff --git a/gensrc/proto/descriptors.proto b/gensrc/proto/descriptors.proto
index ff8c946124..7866c3d88f 100644
--- a/gensrc/proto/descriptors.proto
+++ b/gensrc/proto/descriptors.proto
@@ -33,9 +33,9 @@ message PSlotDescriptor {
     required int32 null_indicator_bit = 7;
     required string col_name = 8;
     required int32 slot_idx = 9;
-    required bool is_materialized = 10;
-    required int32 col_unique_id = 11;
-    required bool is_key = 12;
+    optional bool is_materialized = 10;
+    optional int32 col_unique_id = 11;
+    optional bool is_key = 12;
 };
 
 message PTupleDescriptor {