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feat: add downcast_owned_builder #13765
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add downcast_owned_builder
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Summary
Add
try_upcast_column_builder
andtry_downcast_owned_builder
for ValueType, so the types likeNullableType
andArrayType
can downcast builder.This change is![Reviewable](https://camo.githubusercontent.com/1541c4039185914e83657d3683ec25920c672c6c5c7ab4240ee7bff601adec0b/68747470733a2f2f72657669657761626c652e696f2f7265766965775f627574746f6e2e737667)