rdblue commented on a change in pull request #2952:
URL: https://github.com/apache/iceberg/pull/2952#discussion_r693532782
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File path: api/src/main/java/org/apache/iceberg/types/PruneColumns.java
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@@ -77,43 +91,47 @@ public Type struct(Types.StructType struct, List<Type>
fieldResults) {
@Override
public Type field(Types.NestedField field, Type fieldResult) {
if (selected.contains(field.fieldId())) {
- return field.type();
+ if (field.type().isStructType() && !selectFullTypes) {
+ return projectSelectedStruct(fieldResult);
+ } else {
+ Preconditions.checkArgument(selectFullTypes ||
!field.type().isNestedType(),
+ "Cannot select partial List or Map types explicitly");
Review comment:
Should this include the ID and field that was selected to give more
context?
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