gabeiglio opened a new pull request, #3780:
URL: https://github.com/apache/iceberg-python/pull/3780
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Closes #3758
# Rationale for this change
_build_delete_files_partition_predicate collects data_file.partition records
from the deleted files. Those records hold already transformed values, but it
passed them to Transaction._build_partition_predicate, which names fields by
the source column. So the day ordinal got interpreted as a raw timestamp and
transformed a second time.
## Are these changes tested?
Yes added a regression test for upsert.
## Are there any user-facing changes?
Yes, it fixes the undefined behavior in upsert
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