nandorKollar commented on code in PR #13562:
URL: https://github.com/apache/iceberg/pull/13562#discussion_r2216002769
##########
arrow/src/main/java/org/apache/iceberg/arrow/vectorized/VectorizedArrowReader.java:
##########
@@ -213,8 +218,10 @@ private void allocateFieldVector(boolean
dictionaryEncodedVector) {
allocateDictEncodedVector();
} else {
Field arrowField =
ArrowSchemaUtil.convert(getPhysicalType(columnDescriptor, icebergField));
- if (columnDescriptor.getPrimitiveType().getOriginalType() != null) {
- allocateVectorBasedOnOriginalType(columnDescriptor.getPrimitiveType(),
arrowField);
+ if (columnDescriptor.getPrimitiveType().getLogicalTypeAnnotation() !=
null
+ && !(columnDescriptor.getPrimitiveType().getLogicalTypeAnnotation()
+ instanceof LogicalTypeAnnotation.UUIDLogicalTypeAnnotation)) {
+
allocateVectorBasedOnLogicalTypeAnnotation(columnDescriptor.getPrimitiveType(),
arrowField);
Review Comment:
You mean why use logical type annotations instead of original types? In
parquet-format, logical types were represented as
[`ConvertedTypes`](https://github.com/apache/parquet-format/blob/master/src/main/thrift/parquet.thrift#L536),
which is called in parquet-mr `OriginalType`. As it was an enum, it didn't
give sufficient flexibility, there was no way to properly represent logical
type parameters, like for example decimal precision and scale, time unit for
timestamps etc, therefore it was replaced with a union of structs called
[`LogicalType`](https://github.com/apache/parquet-format/blob/master/src/main/thrift/parquet.thrift#L471).
New types, like variant, geometry don't have a proper `OriginalType`
representation, only logical types. Nanosecond precision timestamp type falls
into this category:
https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#deprecated-timestamp-convertedtype.
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