mapleFU commented on code in PR #43740:
URL: https://github.com/apache/arrow/pull/43740#discussion_r1730981644
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python/pyarrow/_dataset.pyx:
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@@ -2505,6 +2505,43 @@ cdef class Partitioning(_Weakrefable):
result = self.partitioning.Parse(tobytes(path))
return Expression.wrap(GetResultValue(result))
+ def format(self, expr):
+ """
+ Convert a filter expression into a tuple of (directory, filename)
using
+ the current partitioning scheme
+
+ Parameters
+ ----------
+ expr : pyarrow.dataset.Expression
+
+ Returns
+ -------
+ tuple[str, str]
+
+ Examples
+ --------
+
+ Specify the Schema for paths like "/2009/June":
+
+ >>> import pyarrow as pa
+ >>> import pyarrow.dataset as ds
+ >>> import pyarrow.compute as pc
+ >>> part = ds.partitioning(pa.schema([("year", pa.int16()),
+ ... ("month", pa.string())]))
+ >>> part.format(
+ ... (pc.field("year") == 1862) & (pc.field("month") == "Jan")
+ ... )
+ """
+ cdef:
+ CResult[CPartitionPathFormat] result
Review Comment:
@pitrou I'm not familiar with CPython, and I didn't find the answer, do you
think this would be cost, or this separate assign could be optimized out by
compiler?
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