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Fix dask_cudf.read_parquet regression for legacy timestamp data #15929

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merged 7 commits into from
Jun 11, 2024
Merged

Fix dask_cudf.read_parquet regression for legacy timestamp data #15929

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0d24de1
handle timezone-aware parquet data in dask-cudf
rjzamora Jun 5, 2024
bc20707
Merge remote-tracking branch 'upstream/branch-24.08' into timezone-re…
rjzamora Jun 5, 2024
c07e109
Merge remote-tracking branch 'upstream/branch-24.08' into timezone-re…
rjzamora Jun 5, 2024
c49a300
Apply suggestions from code review
rjzamora Jun 5, 2024
514f380
Merge branch 'timezone-read-parquet' of github.com:rjzamora/cudf into…
rjzamora Jun 5, 2024
99f77aa
revise
rjzamora Jun 10, 2024
99f565d
Merge branch 'branch-24.08' into timezone-read-parquet
rjzamora Jun 11, 2024
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5 changes: 5 additions & 0 deletions python/dask_cudf/dask_cudf/io/parquet.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
from io import BufferedWriter, BytesIO, IOBase

import numpy as np
import pandas as pd
from pyarrow import dataset as pa_ds, parquet as pq

from dask import dataframe as dd
Expand Down Expand Up @@ -41,6 +42,10 @@ def _create_dd_meta(cls, dataset_info, **kwargs):
meta_pd = super()._create_dd_meta(dataset_info, **kwargs)

# Convert to cudf
# (drop unsupported timezone information)
for k, v in meta_pd.dtypes.items():
if isinstance(v, pd.DatetimeTZDtype) and v.tz is not None:
meta_pd[k] = meta_pd[k].dt.tz_localize(None)
meta_cudf = cudf.from_pandas(meta_pd)

# Re-set "object" dtypes to align with pa schema
Expand Down
9 changes: 4 additions & 5 deletions python/dask_cudf/dask_cudf/io/tests/test_parquet.py
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Original file line number Diff line number Diff line change
Expand Up @@ -610,9 +610,8 @@ def test_timezone_column(tmpdir):
}
)
pdf.to_parquet(path)

# Check that `cudf` and `dask_cudf` results match
got = dask_cudf.read_parquet(path)
# cudf.read_parquet does not support reading timezone aware types yet
assert got["time"].dtype == pd.DatetimeTZDtype("ns", "UTC")
got["time"] = got["time"].astype("datetime64[ns]")
expected = cudf.read_parquet(path)
dd.assert_eq(got, expected)
expect = cudf.read_parquet(path)
dd.assert_eq(got, expect)
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