kevinjqliu commented on code in PR #569:
URL: https://github.com/apache/iceberg-python/pull/569#discussion_r1581278513
##########
pyiceberg/table/__init__.py:
##########
@@ -434,6 +456,9 @@ def overwrite(
if table_arrow_schema != df.schema:
df = df.cast(table_arrow_schema)
+ with
self.update_snapshot(snapshot_properties=snapshot_properties).delete() as
delete_snapshot:
+ delete_snapshot.delete_by_predicate(overwrite_filter)
+
with
self.update_snapshot(snapshot_properties=snapshot_properties).overwrite() as
update_snapshot:
# skip writing data files if the dataframe is empty
Review Comment:
does the order of operation matter here? Should update be first or delete?
##########
tests/integration/test_writes/test_writes.py:
##########
@@ -119,52 +119,55 @@ def test_query_count(spark: SparkSession, format_version:
int) -> None:
@pytest.mark.integration
-@pytest.mark.parametrize("col", TEST_DATA_WITH_NULL.keys())
@pytest.mark.parametrize("format_version", [1, 2])
-def test_query_filter_null(spark: SparkSession, col: str, format_version: int)
-> None:
+def test_query_filter_null(spark: SparkSession, arrow_table_with_null:
pa.Table, format_version: int) -> None:
Review Comment:
great! this should cut down the number of parameterized tests
##########
pyiceberg/table/__init__.py:
##########
@@ -292,7 +303,13 @@ def _apply(self, updates: Tuple[TableUpdate, ...],
requirements: Tuple[TableRequ
requirement.validate(self.table_metadata)
self._updates += updates
- self._requirements += requirements
+
+ # For the requirements, it does not make sense to add a requirement
more than once
+ # For example, you cannot assert that the current schema has two
different IDs
+ existing_requirements = {type(requirement) for requirement in
self._requirements}
+ for new_requirement in requirements:
+ if type(new_requirement) not in existing_requirements:
+ self._requirements = self._requirements + requirements
Review Comment:
nit: should we add a warning about dropped requirements here? Alternatively,
instead of dropping requirements, it might make sense to throw if there are
multiple requirements of the same type.
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