rui-mo commented on code in PR #13041:
URL: https://github.com/apache/gluten/pull/13041#discussion_r4471535139
##########
cpp/velox/substrait/VeloxToSubstraitExpr.cc:
##########
@@ -99,9 +99,45 @@ const ::substrait::Expression_Literal&
toSubstraitNullLiteral(
return *substraitField;
}
+const ::substrait::Expression_Literal& toSubstraitNullLiteral(
+ google::protobuf::Arena& arena,
+ const velox::TypePtr& type) {
+ auto nestedType = type;
+ while (nestedType->isArray()) {
+ nestedType = nestedType->asArray().elementType();
+ }
+ // Preserve physical-kind encoding for non-timestamp nulls.
+ if (nestedType->kind() != TypeKind::TIMESTAMP) {
+ return toSubstraitNullLiteral(arena, type->kind());
+ }
+ ::substrait::Expression_Literal* substraitField =
Review Comment:
Is there a particular reason why a null literal of type `Timestamp` cannot
be handled by the existing `toSubstraitNullLiteral` function?
```
const ::substrait::Expression_Literal& toSubstraitNullLiteral(
google::protobuf::Arena& arena,
const velox::TypeKind& typeKind)
```
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