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func.unnest loses type information #297

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jimfulton opened this issue Aug 25, 2021 · 0 comments · Fixed by #298
Closed

func.unnest loses type information #297

jimfulton opened this issue Aug 25, 2021 · 0 comments · Fixed by #298
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api: bigquery Issues related to the googleapis/python-bigquery-sqlalchemy API.

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Given a column expression with type ARRAY<T>, calling func.unnest(expr) should result in a column of type T, nit it results in NullType instead.

>>> am.c.objects.type
ARRAY(JSON())
>>> select(func.unnest(am.c.objects).alias('another_mock_objects').column).subquery().c.another_mock_objects.type
NullType()
@product-auto-label product-auto-label bot added the api: bigquery Issues related to the googleapis/python-bigquery-sqlalchemy API. label Aug 25, 2021
@jimfulton jimfulton mentioned this issue Aug 25, 2021
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api: bigquery Issues related to the googleapis/python-bigquery-sqlalchemy API.
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fix: the unnest function lost needed type information jimfulton/python-bigquery-sqlalchemy
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