jorisvandenbossche commented on a change in pull request #7027:
URL: https://github.com/apache/arrow/pull/7027#discussion_r416374325
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File path: python/pyarrow/array.pxi
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@@ -1720,6 +1720,39 @@ cdef class UnionArray(Array):
Concrete class for Arrow arrays of a Union data type.
"""
+ def child(self, int pos):
+ """
+ Return the given child array as an individual array.
+
+ For sparse unions, the returned array has its offset, length,
+ and null count adjusted.
+
+ For dense unions, the returned array is unchanged.
+ """
+ cdef shared_ptr[CArray] result
+ result = (<CUnionArray*> self.ap).child(pos)
+ if result != NULL:
+ return pyarrow_wrap_array(result)
+ raise KeyError("UnionArray does not have child {}".format(pos))
+
+ @property
+ def type_codes(self):
+ """Get the type codes array."""
+ buf = pyarrow_wrap_buffer((<CUnionArray*> self.ap).type_codes())
+ return Array.from_buffers(int8(), len(self), [None, buf])
+
+ @property
+ def value_offsets(self):
Review comment:
For ListArray, this is called "offsets" (not sure if we prefer
consistency within the python api, or consistency with the c++ api)
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