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fix(python): ensure pyarrow.compute module is loaded #6353

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Jan 22, 2023
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fix(python): ensure pyarrow.compute module is loaded #6353

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6 changes: 4 additions & 2 deletions py-polars/polars/internals/construction.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1178,9 +1178,11 @@ def pandas_to_pydf(


def coerce_arrow(array: pa.Array, rechunk: bool = True) -> pa.Array:
import pyarrow.compute as pc

# note: Decimal256 could not be cast to float
if isinstance(array.type, pa.Decimal128Type):
array = pa.compute.cast(array, pa.float64())
array = pc.cast(array, pa.float64())

if hasattr(array, "num_chunks") and array.num_chunks > 1 and rechunk:
# small integer keys can often not be combined, so let's already cast
Expand All @@ -1192,7 +1194,7 @@ def coerce_arrow(array: pa.Array, rechunk: bool = True) -> pa.Array:
or pa.types.is_uint16(array.type.index_type)
or pa.types.is_int32(array.type.index_type)
):
array = pa.compute.cast(
array = pc.cast(
array, pa.dictionary(pa.uint32(), pa.large_string())
).combine_chunks()
return array