rdblue commented on code in PR #13445:
URL: https://github.com/apache/iceberg/pull/13445#discussion_r2263781326
##########
api/src/main/java/org/apache/iceberg/types/Types.java:
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@@ -1160,6 +1160,10 @@ public static ListType ofRequired(int elementId, Type
elementType) {
private transient List<NestedField> fields = null;
private ListType(NestedField elementField) {
+ Preconditions.checkArgument(
+ !elementField.type().equals(UnknownType.get()),
+ "Cannot create ListType with unknown type: %s",
+ elementField.name);
Review Comment:
I'm not sure that we should fail here. Can't Avro represent a list of
unknowns using a `NULL` schema?
I would rather fail in the Parquet integration when converting to a Parquet
schema because this is not allowed in Parquet but is fine in Avro or Iceberg.
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