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fix(python): skip empty row groups during stats gathering #2172

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merged 3 commits into from
Feb 6, 2024
Merged

fix(python): skip empty row groups during stats gathering #2172

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2e6a338
skip row groups with 0 records
ion-elgreco Feb 6, 2024
723f91f
add test
ion-elgreco Feb 6, 2024
d9c212d
Update python/tests/test_writer.py
ion-elgreco Feb 6, 2024
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3 changes: 2 additions & 1 deletion python/deltalake/writer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -666,7 +666,8 @@ def get_file_stats_from_metadata(

def iter_groups(metadata: Any) -> Iterator[Any]:
for i in range(metadata.num_row_groups):
yield metadata.row_group(i)
if metadata.row_group(i).num_rows > 0:
yield metadata.row_group(i)

for column_idx in range(metadata.num_columns):
name = metadata.row_group(0).column(column_idx).path_in_schema
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22 changes: 22 additions & 0 deletions python/tests/test_writer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1251,3 +1251,25 @@ def test_with_deltalake_schema(tmp_path: pathlib.Path, sample_data: pa.Table):
)
delta_table = DeltaTable(tmp_path)
assert delta_table.schema().to_pyarrow() == sample_data.schema


def test_write_stats_empty_rowgroups(tmp_path: pathlib.Path):
# https://github.com/delta-io/delta-rs/issues/2169
data = pa.table(
{
"data": pa.array(["B"] * 1024 * 33),
}
)
write_deltalake(
tmp_path,
data,
max_rows_per_file=1024 * 32,
max_rows_per_group=1024 * 16,
min_rows_per_group=8 * 1024,
mode="overwrite",
)
dt = DeltaTable(tmp_path)
assert (
dt.to_pyarrow_dataset().to_table(filter=(pc.field("data") == "B")).shape[0]
== 33792
)
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