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Antoine Pitrou updated ARROW-15479: ----------------------------------- Labels: good-second-issue kernel (was: kernel) > [C++] Cast fixed size list to compatible fixed size list type (other values > type, other field name) > --------------------------------------------------------------------------------------------------- > > Key: ARROW-15479 > URL: https://issues.apache.org/jira/browse/ARROW-15479 > Project: Apache Arrow > Issue Type: Improvement > Components: C++ > Reporter: Joris Van den Bossche > Priority: Major > Labels: good-second-issue, kernel > > Casting a FixedSizeListArray to a compatible type but only a different field > name isn't implemented: > {code:python} > >>> my_type = pa.list_(pa.field("element", pa.int64()), 2) > >>> arr = pa.FixedSizeListArray.from_arrays(pa.array([1, 2, 3, 4, 5, 6]), 2) > >>> arr.type > FixedSizeListType(fixed_size_list<item: int64>[2]) > >>> my_type > FixedSizeListType(fixed_size_list<element: int64>[2]) > >>> arr.cast(my_type) > ... > ArrowNotImplementedError: Unsupported cast from fixed_size_list<item: > int64>[2] to fixed_size_list using function cast_fixed_size_list > {code} > While the similar operation with a variable sized list actually works: > {code:python} > >>> my_type = pa.list_(pa.field("element", pa.int64())) > >>> arr = pa.array([[1, 2], [3, 4]], pa.list_(pa.int64())) > >>> arr.type > ListType(list<item: int64>) > >>> arr.cast(my_type).type > ListType(list<element: int64>) > {code} -- This message was sent by Atlassian Jira (v8.20.10#820010)