rdblue commented on code in PR #11904:
URL: https://github.com/apache/iceberg/pull/11904#discussion_r1927618131
##########
parquet/src/main/java/org/apache/iceberg/data/parquet/BaseParquetWriter.java:
##########
@@ -50,6 +54,32 @@ protected ParquetValueWriter<T> createWriter(MessageType
type) {
protected abstract ParquetValueWriters.StructWriter<T> createStructWriter(
List<ParquetValueWriter<?>> writers);
+ protected ParquetValueWriter<?> fixedWriter(ColumnDescriptor desc) {
+ return new FixedWriter(desc);
+ }
+
+ protected ParquetValueWriters.PrimitiveWriter<?> dateWriter(ColumnDescriptor
desc) {
+ return new DateWriter(desc);
+ }
+
+ protected ParquetValueWriters.PrimitiveWriter<?> timeWriter(ColumnDescriptor
desc) {
+ return new TimeWriter(desc);
+ }
+
+ protected ParquetValueWriters.PrimitiveWriter<?> timestampWriter(
+ ColumnDescriptor desc, boolean isAdjustedToUTC) {
+ if (isAdjustedToUTC) {
+ return new TimestamptzWriter(desc);
+ } else {
+ return new TimestampWriter(desc);
+ }
+ }
+
+ protected ParquetValueWriters.PrimitiveWriter<?> uuidWriter(ColumnDescriptor
desc) {
+ // Use primitive-type writer; no special writer needed.
Review Comment:
Okay, I did some digging and it looks like this behavior was accidentally
introduced when moving to the type annotation visitor
(https://github.com/apache/iceberg/commit/1d13a10d4c8a1174083eb81373310b8499f84f44).
Before that point, UUID was not supported but after that it would fall through
to the primitive type and return a writer for bytes.
The problem is that this conflicts with the representation used by the Avro
generic object model:
https://github.com/apache/iceberg/blob/main/core/src/main/java/org/apache/iceberg/avro/ValueReaders.java#L108-L110
I think this change is the right choice because the object models should
match and using UUID for this is well-established in the Avro implementation
and the generic random data generator.
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