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https://issues.apache.org/jira/browse/ARROW-1950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16304052#comment-16304052
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Phillip Cloud commented on ARROW-1950:
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There are a couple issues here:
1. We're mapping arrow null types to float64 because of nans, but I don't think
that's correct since null is both tye type of typeless missing values _and_ the
type of empty things, including the value type for empty lists and maps. Really
the {{pandas_type}} should be {{'empty'}}.
2. The C++ table_to_blocks function doesn't actually support null types
> [Python] pandas_type in pandas metadata incorrect for List types
> ----------------------------------------------------------------
>
> Key: ARROW-1950
> URL: https://issues.apache.org/jira/browse/ARROW-1950
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Reporter: Wes McKinney
> Fix For: 0.9.0
>
>
> see https://github.com/pandas-dev/pandas/pull/18201#issuecomment-353042438
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