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fix: Calling count on a pyarrow dataset results in an error #843

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Sep 22, 2024
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fix: Calling count on a pyarrow dataset results in an error #843

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19 changes: 19 additions & 0 deletions python/datafusion/tests/test_context.py
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Original file line number Diff line number Diff line change
Expand Up @@ -372,6 +372,25 @@ def test_dataset_filter(ctx, capfd):
assert result[0].column(1) == pa.array([-3])


def test_dataset_count(ctx):
# `datafusion-python` issue: https://github.com/apache/datafusion-python/issues/800
batch = pa.RecordBatch.from_arrays(
[pa.array([1, 2, 3]), pa.array([4, 5, 6])],
names=["a", "b"],
)
dataset = ds.dataset([batch])
ctx.register_dataset("t", dataset)

# Testing the dataframe API
df = ctx.table("t")
assert df.count() == 3

# Testing the SQL API
count = ctx.sql("SELECT COUNT(*) FROM t")
count = count.collect()
assert count[0].column(0) == pa.array([3])


def test_pyarrow_predicate_pushdown_is_null(ctx, capfd):
"""Ensure that pyarrow filter gets pushed down for `IsNull`"""
# create a RecordBatch and register it as a pyarrow.dataset.Dataset
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