disallow updating system col

Signed-off-by: Bugen Zhao <[email protected]>

e2e_test/batch/basic/dml_update.slt.part

@@ -108,5 +108,11 @@ statement error source for a multiple-column UPDATE item must be a sub-SELECT or
 update t set (v1, v2) = v1 + 1;
 
 
+# Assignment to system columns.
+statement error update modifying column `_rw_timestamp` is unsupported
+update t set _rw_timestamp = _rw_timestamp + interval '1 second';
+
+
+
 statement ok
 drop table t;

src/frontend/src/binder/update.rs

@@ -247,6 +247,11 @@ impl Binder {
                 )
                 .into());
             }
+
+            let col = &table.table_catalog.columns()[id_index];
+            if !col.can_dml() {
+                bail_bind_error!("update modifying column `{}` is unsupported", col.name());
+            }
         }
 
         let (returning_list, fields) = self.bind_returning_list(returning_items)?;