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https://issues.apache.org/jira/browse/ARROW-3112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590144#comment-16590144
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Uwe L. Korn commented on ARROW-3112:
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This is because there is not halffloat type in Parquet. We could coerce this
automatically to float:
https://github.com/apache/parquet-format/blob/master/src/main/thrift/parquet.thrift#L37
> Can't save a df using Parquet if using float16
> ----------------------------------------------
>
> Key: ARROW-3112
> URL: https://issues.apache.org/jira/browse/ARROW-3112
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.10.0
> Reporter: Naor Volkovich
> Priority: Major
>
> When trying to save a Pandas DF using "to_parquet" when that DF has a column
> with a dtype of float16, I get the error:
> "pyarrow.lib.ArrowNotImplementedError: Unhandled type for Arrow to Parquet
> schema conversion: halffloat"
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