test_transform.py

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from pyiceberg_core import bucket_transform

import pytest
import pyarrow as pa


def test_bucket_pyarrow_array():
    arr = pa.array([1, 2])
    result = bucket_transform(arr, 10)
    expected = pa.array([6, 2], type=pa.int32())
    assert result == expected


def test_bucket_pyarrow_array_list_type_fails():
    arr = pa.array([[1, 2], [3, 4]])
    with pytest.raises(
        ValueError,
        match=r"FeatureUnsupported => Unsupported data type for bucket transform",
    ):
        bucket_transform(arr, 10)


def test_bucket_chunked_array():
    chunked = pa.chunked_array([pa.array([1, 2]), pa.array([3, 4])])
    result_chunks = []
    for arr in chunked.iterchunks():
        result_chunks.append(bucket_transform(arr, 10))

    expected = pa.chunked_array(
        [pa.array([6, 2], type=pa.int32()), pa.array([5, 0], type=pa.int32())]
    )
    assert pa.chunked_array(result_chunks).equals(expected)