nssalian commented on code in PR #18434:
URL: https://github.com/apache/iceberg/pull/18434#discussion_r4362316720


##########
arrow/src/main/java/org/apache/iceberg/arrow/vectorized/VectorizedReaderBuilder.java:
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@@ -157,6 +157,12 @@ public VectorizedReader<?> struct(
 
   @Override
   public ParquetVariantVisitor<VectorizedReader<?>> variantVisitor() {
+    // skip variants that are not projected, like primitives, so their 
shredded layout is not read
+    Type variant = parquetSchema.getType(currentPath());
+    if (variant.getId() == null || 
icebergSchema.findField(variant.getId().intValue()) == null) {

Review Comment:
   Could you add a test case where the variant has no field id? Every case in 
`unprojectedShreddedVariants()` sets one, so this `getId() == null` check isn't 
covered. The case where it can happen for a variant inside a struct when the 
file has no field ids, because `addFallbackIds` only assigns ids to top-level 
fields.



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