Fokko commented on code in PR #1879:
URL: https://github.com/apache/iceberg-python/pull/1879#discussion_r2044268567
##########
tests/integration/test_deletes.py:
##########
@@ -467,21 +467,19 @@ def
test_partitioned_table_positional_deletes_sequence_number(spark: SparkSessio
assert snapshots[2].summary == Summary(
Operation.OVERWRITE,
Review Comment:
When I change it into CoW, I get for snapshot summary 1 (the delete
performend by Spark):
```json
{
"spark.app.id": "local-1744714815877",
"added-data-files": "1",
"deleted-data-files": "1",
"added-records": "1",
"deleted-records": "2",
"added-files-size": "714",
"removed-files-size": "743",
"changed-partition-count": "1",
"total-records": "4",
"total-files-size": "1461",
"total-data-files": "2",
"total-delete-files": "0",
"total-position-deletes": "0",
"total-equality-deletes": "0",
"engine-version": "3.5.1",
"app-id": "local-1744714815877",
"engine-name": "spark",
"iceberg-version": "Apache Iceberg 1.8.0 (commit
c277c2014a1b37fe755cfe37f173b6465bb8cb73)"
}
```
Which seems correct:
```
(10, 100),
(10, 101), <- Deleted by Spark
(20, 200),
(20, 201),
(20, 202)
```
PyIceberg has a different approach, where this is an `Overwrite`, and first
creates a snapshot that rewrites the original data file, then appends a new
file with the new updated record.
To reproduce this, I just removed the `TBLPROPERTIES` to set MoR.
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