lkokhreidze opened a new issue, #10211:
URL: https://github.com/apache/iceberg/issues/10211
### Query engine
Flink
### Question
Hello,
I searched the documentation as much as possible but couldn't find the
decisive answer.
We have a Flink Streaming pipeline that writes to the Iceberg table. The
table has upsert enabled and uses a Copy-On-Write merge strategy. When checking
the latest snapshot, we still see a lot of deleted files being created. The
Flink streaming pipeline commits every minute. My question is, is it still
normal to create delete files even with Copy-on-Write being used?
Table properties:
```
write.upsert.enabled=true,
write.parquet.compression-codec=zstd,
format-version=2,
write.metadata.delete-after-commit.enabled=true,
history.expire.min-snapshots-to-keep=5,
history.expire.max-snapshot-age-ms=3600000,
write.metadata.previous-versions-max=50,
write.parquet.bloom-filter-enabled.column._source_metadata_key=true,
write.target-file-size-bytes=536870912,
write.object-storage.enabled=true,
write.metadata.metrics.column.payload=none,
commit.manifest.min-count-to-merge=50
```
Table schema:
```
'table {
0: _source_metadata_key: required string (id)
1: _source_metadata_split_id: required int
2: _source_metadata_offset: required long
3: _source_metadata_created_at: required timestamptz
4: payload: required string
5: time: optional timestamptz
6: time_month: optional date
}' with partitionSpec '[
1000: submit_time_month: identity(6)
]'
```
Equality field names `[_source_metadata_key, time_month]`
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