judahrand commented on code in PR #34234:
URL: https://github.com/apache/arrow/pull/34234#discussion_r1369185194
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python/pyarrow/_dataset.pyx:
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@@ -874,6 +874,63 @@ cdef class Dataset(_Weakrefable):
output_type=InMemoryDataset
)
+ def join_asof(self, right_dataset, on, by, tolerance, right_on=None,
right_by=None):
+ """
+ Perform an asof join between this dataset and another one.
+
+ Result of the join will be a new Dataset, where further
+ operations can be applied.
+
+ Parameters
+ ----------
+ right_dataset : dataset
+ The dataset to join to the current one, acting as the right dataset
+ in the join operation.
+ on : str
+ The column from current dataset that should be used as the on key
+ of the join operation left side.
+
+ An inexact match is used on the “on” key.i.e., a row is considered
a
+ match iff left_on - tolerance <= right_on <= left_on.
+
+ The input table must be sorted by the “on” key. Must be a single
+ field of a common type.
+
+ Currently, the “on” key must be an integer, date, or timestamp
type.
+ by : str or list[str]
+ The columns from current dataset that should be used as the keys
+ of the join operation left side.
Review Comment:
https://github.com/apache/arrow/pull/34234/commits/acb082e8da4647c13a60484f654d7ca1425f7f6e
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