mihaibudiu commented on code in PR #4572:
URL: https://github.com/apache/calcite/pull/4572#discussion_r2415044684


##########
core/src/main/java/org/apache/calcite/rel/rel2sql/RelToSqlConverter.java:
##########
@@ -1141,16 +1138,21 @@ public Result visit(TableModify modify) {
       return result(sqlInsert, ImmutableList.of(), modify, null);
     }
     case UPDATE: {
+      final List<String> updateColumnList =
+          requireNonNull(modify.getUpdateColumnList(),
+              () -> "modify.getUpdateColumnList() is null for " + modify);
       final Result input = visitInput(modify, 0);
+      final SqlSelect sourceSelect = input.asSelect();

Review Comment:
   What is this this SqlSelect node?



##########
core/src/main/java/org/apache/calcite/rel/rel2sql/RelToSqlConverter.java:
##########
@@ -1141,16 +1138,21 @@ public Result visit(TableModify modify) {
       return result(sqlInsert, ImmutableList.of(), modify, null);
     }
     case UPDATE: {
+      final List<String> updateColumnList =
+          requireNonNull(modify.getUpdateColumnList(),
+              () -> "modify.getUpdateColumnList() is null for " + modify);
       final Result input = visitInput(modify, 0);
+      final SqlSelect sourceSelect = input.asSelect();

Review Comment:
   What is this SqlSelect node?



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