Fokko opened a new pull request, #6872:
URL: https://github.com/apache/iceberg/pull/6872
We check for redundant partitions when creating a bound partition spec:
```java
PartitionSpec.builderFor(SCHEMA).year("ts").month("ts").build())
```
Raises:
```
IllegalArgumentException:
Cannot add redundant partition: 1000: ts_year: year(2) conflicts with
1001: ts_month: month(2)
```
However, if you `.bind()` a UnboundPartitionSpec to a PartitionSpec, using
`.bind()` this check isn't done, and this allows you to create partitions with
redundant partitions:
Ends up with:
```
s3://warehouse/wh/default/iceberg_table/data/ts_year=2019/ts_month=2019-06/ts_day=2019-06-13/00000-12-6a2ee5a1-201c-4ca9-a07c-379940c7f83e-00001.parquet
```
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