RussellSpitzer commented on a change in pull request #1744:
URL: https://github.com/apache/iceberg/pull/1744#discussion_r521779472
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File path: core/src/main/java/org/apache/iceberg/avro/PruneColumns.java
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@@ -90,12 +92,18 @@ public Schema record(Schema record, List<String> names,
List<Schema> fields) {
} else if (fieldSchema != null) {
hasChange = true;
filteredFields.add(copyField(field, fieldSchema, fieldId));
+ } else if (emptyStructIds.contains(fieldId)) {
+ // This field does not require any known sub-fields but is required in
the projection so keep it without
+ // any of it's subfields
+ hasChange = true;
+ Schema empty = AvroSchemaUtil.removeFields(field);
Review comment:
CopyRecord does not work on UnionTypes :(
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