wgtmac commented on code in PR #662:
URL: https://github.com/apache/iceberg-cpp/pull/662#discussion_r3287254438
##########
src/iceberg/schema_util.cc:
##########
@@ -79,6 +82,55 @@ Status ValidateSchemaEvolution(const Type& expected_type,
const Type& source_typ
return NotSupported("Cannot read {} from {}", expected_type, source_type);
}
+Result<FieldProjection> ProjectNested(const Type& expected_type, const Type&
source_type,
+ bool prune_source);
+
+Result<FieldProjection> ProjectField(const SchemaField& expected_field,
+ const SchemaField& source_field, size_t
source_index,
+ bool prune_source) {
+ FieldProjection projection;
+
+ if (expected_field.type()->type_id() == TypeId::kUnknown) {
+ if (!expected_field.optional()) {
+ return InvalidSchema("Cannot project required field with id {} as null",
+ expected_field.field_id());
+ }
+ projection.kind = FieldProjection::Kind::kNull;
+ return projection;
+ }
+
+ if (source_field.type()->type_id() == TypeId::kUnknown &&
+ expected_field.type()->is_nested()) {
+ if (!expected_field.optional()) {
+ return InvalidSchema("Cannot project required field with id {} as null",
+ expected_field.field_id());
+ }
+ projection.kind = FieldProjection::Kind::kNull;
+ return projection;
+ }
+
+ if (source_field.type()->type_id() == TypeId::kUnknown &&
!expected_field.optional()) {
+ return InvalidSchema("Cannot project required field with id {} as null",
+ expected_field.field_id());
+ }
+
+ if (expected_field.type()->is_nested()) {
Review Comment:
https://iceberg.apache.org/spec/#schema-evolution
It says `Valid primitive type promotions are` and `Evolving primitive types
to structs is not allowed`.
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