wmoustafa commented on code in PR #7392:
URL: https://github.com/apache/iceberg/pull/7392#discussion_r1210481363
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core/src/main/java/org/apache/iceberg/avro/SchemaToType.java:
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@@ -104,13 +104,23 @@ public Type record(Schema record, List<String> names,
List<Type> fieldTypes) {
@Override
public Type union(Schema union, List<Type> options) {
- Preconditions.checkArgument(
- AvroSchemaUtil.isOptionSchema(union), "Unsupported type: non-option
union: %s", union);
- // records, arrays, and maps will check nullability later
- if (options.get(0) == null) {
- return options.get(1);
+ if (AvroSchemaUtil.isOptionSchema(union)) {
+ if (options.get(0) == null) {
+ return options.get(1);
+ } else {
+ return options.get(0);
+ }
} else {
- return options.get(0);
+ // Create list of Iceberg schema fields
+ List<Types.NestedField> fields =
Lists.newArrayListWithExpectedSize(options.size());
+ int tagIndex = 0;
+ fields.add(Types.NestedField.required(allocateId(), "tag",
Types.IntegerType.get()));
+ for (Type option : options) {
+ if (option != null) {
Review Comment:
Also, the `tag` field value will align with the non-optional branch indexes
(in subsequent read PR).
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