sriharshaj commented on code in PR #12634:
URL: https://github.com/apache/iceberg/pull/12634#discussion_r2289426616
##########
parquet/src/main/java/org/apache/iceberg/parquet/PruneColumns.java:
##########
@@ -90,11 +90,11 @@ public Type struct(StructType expected, GroupType struct,
List<Type> fields) {
Type originalField = struct.getType(i);
Type field = fields.get(i);
Integer fieldId = getId(originalField);
- if (fieldId != null && selectedIds.contains(fieldId)) {
- filteredFields.add(originalField);
- } else if (field != null) {
- filteredFields.add(originalField);
+ if (field != null) {
+ filteredFields.add(field);
hasChange = true;
+ } else if (fieldId != null && selectedIds.contains(fieldId)) {
Review Comment:
When we select the entire struct column like:
```
SELECT response FROM http_log
```
`response` is expanded into all of its nested fields, and adds every nested
field’s id to the selected id list.
By the time we reach this code path, `field` already matches `originalField`.
So in the above case you mentioned, we will return correct projection.
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