Hey folks, While reviewing a PR to fix DayTransform in PyIceberg (#1208 <https://github.com/apache/iceberg-python/pull/1208>), we found an inconsistency between the spec and the Java Iceberg library.
According to the spec <https://iceberg.apache.org/spec/#partition-transforms>, the result type for the "day partition transform" should be `int`, similar to other time-based partition transforms (year/month/hour). However, in the Java Iceberg library, the result type for day partition transform is `DateType` ( source <https://github.com/apache/iceberg/blob/dddb5f423b353d961b8a08eb2cb4371d453c2959/api/src/main/java/org/apache/iceberg/transforms/Days.java#L47>). This seems to be a discrepancy from the spec, as the day partition transform is the only time-based transform with a non-int result type—whereas the others use IntegerType (source <https://grep.app/search?q=getResultType&filter[repo][0]=apache/iceberg&filter[path][0]=api/src/main/java/org/apache/iceberg/> ). Could someone confirm if my understanding is correct? If so, is there any historical context for this difference? Lastly, how should we approach resolving this moving forward? Best, Kevin
