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https://issues.apache.org/jira/browse/PARQUET-1403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16977620#comment-16977620
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Artem KOZHEVNIKOV commented on PARQUET-1403:
--------------------------------------------
in version 0.15.1 one has the following error :
{code:python}
pa.array(np.array([0.1, 1.2, 2.3], dtype='float16'), type=pa.float64())
---------------------------------------------------------------------------
ArrowNotImplementedError Traceback (most recent call last)
<ipython-input-4-f7961f44e850> in <module>
----> 1 pa.array(np.array([0.1, 1.2, 2.3], dtype='float16'), type=pa.float64())
~/Projects/miniconda3/envs/myenv/lib/python3.7/site-packages/pyarrow/array.pxi
in pyarrow.lib.array()
~/Projects/miniconda3/envs/myenv/lib/python3.7/site-packages/pyarrow/array.pxi
in pyarrow.lib._ndarray_to_array()
~/Projects/miniconda3/envs/myenv/lib/python3.7/site-packages/pyarrow/error.pxi
in pyarrow.lib.check_status()
ArrowNotImplementedError: No cast implemented from halffloat to double
{code}
> [C++] Coerce Arrow half-precision float to float32
> --------------------------------------------------
>
> Key: PARQUET-1403
> URL: https://issues.apache.org/jira/browse/PARQUET-1403
> Project: Parquet
> Issue Type: Bug
> Components: parquet-cpp
> Affects Versions: cpp-1.4.0
> 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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