judahrand commented on code in PR #34234:
URL: https://github.com/apache/arrow/pull/34234#discussion_r1125726158
##########
python/pyarrow/_exec_plan.pyx:
##########
@@ -390,6 +390,120 @@ def _perform_join(join_type, left_operand not None,
left_keys,
return result_table
+def _perform_join_asof(left_operand not None, left_on, left_by,
+ right_operand not None, right_on, right_by,
+ tolerance, output_type=Table):
+ """
+ Perform asof join of two tables or datasets.
+
+ The result will be an output table with the result of the join operation
+
+ Parameters
+ ----------
+ left_operand : Table or Dataset
+ The left operand for the join operation.
+ left_on : str
+ The left key (or keys) on which the join operation should be performed.
+ left_by: str or list[str]
+ The left key (or keys) on which the join operation should be performed.
+ right_operand : Table or Dataset
+ The right operand for the join operation.
+ right_on : str or list[str]
+ The right key (or keys) on which the join operation should be
performed.
+ right_by: str or list[str]
+ The right key (or keys) on which the join operation should be
performed.
+ tolerance : int
+ The tolerance to use for the asof join. The tolerance is interpreted in
+ the same units as the "on" key.
+ output_type: Table or InMemoryDataset
+ The output type for the exec plan result.
+
+ Returns
+ -------
+ result_table : Table or InMemoryDataset
+ """
+ cdef:
+ vector[CFieldRef] c_left_by
+ vector[CFieldRef] c_right_by
+ CAsofJoinKeys c_left_keys
+ CAsofJoinKeys c_right_keys
+ vector[CAsofJoinKeys] c_input_keys
+ vector[CDeclaration] c_decl_plan
+
+ # Prepare left AsofJoinNodeOption::Keys
+ if isinstance(left_by, str):
+ left_by = [left_by]
+ for key in left_by:
+ c_left_by.push_back(CFieldRef(<c_string>tobytes(key)))
+
+ c_left_keys.on_key = CFieldRef(<c_string>tobytes(left_on))
+ c_left_keys.by_key = c_left_by
+
+ c_input_keys.push_back(c_left_keys)
+
+ # Prepare right AsofJoinNodeOption::Keys
+ right_by_order = {}
+ if isinstance(right_by, str):
+ right_by = [right_by]
+ for key in right_by:
+ c_right_by.push_back(CFieldRef(<c_string>tobytes(key)))
+
+ c_right_keys.on_key = CFieldRef(<c_string>tobytes(right_on))
+ c_right_keys.by_key = c_right_by
+
+ c_input_keys.push_back(c_right_keys)
+
+ # By default expose all columns on both left and right table
+ if isinstance(left_operand, Table):
+ left_columns = left_operand.column_names
+ elif isinstance(left_operand, Dataset):
+ left_columns = left_operand.schema.names
+ else:
+ raise TypeError("Unsupported left join member type")
Review Comment:
I believe the reason I added this in is that it was causing the C++
implementation to segfault.
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