It can be any type. You can find it mentioned around [1].

[1]: https://arrow.apache.org/docs/format/Columnar.html#variable-size-list-layout

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On Tue, Jun 6, 2023 at 23:10, James <[email protected]> wrote:
The columnar format spec doesn’t specify (or if it does, then I missed it) what kind of types are allowed to be nested within a List. Is any type valid as a child array? List of structs? Maps?

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