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https://issues.apache.org/jira/browse/ARROW-972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16244681#comment-16244681
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ASF GitHub Bot commented on ARROW-972:
--------------------------------------
pcmoritz commented on a change in pull request #1216: ARROW-972: UnionArray in
pyarrow
URL: https://github.com/apache/arrow/pull/1216#discussion_r149788510
##########
File path: python/pyarrow/scalar.pxi
##########
@@ -315,6 +315,26 @@ cdef class ListValue(ArrayValue):
return result
+cdef class UnionValue(ArrayValue):
+
+ cdef void _set_array(self, const shared_ptr[CArray]& sp_array):
+ self.sp_array = sp_array
+ self.ap = <CUnionArray*> sp_array.get()
+ self.value_types = [pyarrow_wrap_data_type(self.ap.value_type(i))
+ for i in range(self.ap.num_fields())]
Review comment:
Oops, good point! I'm constructing the Python objects for children types
once per array in the UnionType.
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> [Python] Add test cases and basic APIs for UnionArray
> -----------------------------------------------------
>
> Key: ARROW-972
> URL: https://issues.apache.org/jira/browse/ARROW-972
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Python
> Affects Versions: 0.3.0
> Reporter: Wes McKinney
> Assignee: Philipp Moritz
> Labels: pull-request-available
> Fix For: 0.8.0
>
>
> While this is implemented in C++, there isn't any API exposure yet in Python
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