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https://issues.apache.org/jira/browse/ARROW-2432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16432923#comment-16432923
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Bryan Cutler commented on ARROW-2432:
-------------------------------------
BTW, it looks like {{pa.array(data, type=pa.decimal128(12, 4),
from_pandas=True)}} has the same code path that causes the error, as long as
{{data}} is a pandas.Series
{noformat}
In [5]: pa.array(pd.Series([Decimal('3.14'), None]), from_pandas=True,
type=pa.decimal128(12, 4))
---------------------------------------------------------------------------
ArrowInvalid Traceback (most recent call last)
<ipython-input-5-9494a5149101> in <module>()
----> 1 pa.array(pd.Series([Decimal('3.14'), None]), from_pandas=True,
type=pa.decimal128(12, 4))
ArrowInvalid: Error converting from Python objects to Decimal: Got Python
object of type NoneType but can only handle these types: decimal.Decimal
{noformat}
> [Python] from_pandas fails when converting decimals if have None values
> -----------------------------------------------------------------------
>
> Key: ARROW-2432
> URL: https://issues.apache.org/jira/browse/ARROW-2432
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.9.0
> Reporter: Bryan Cutler
> Assignee: Bryan Cutler
> Priority: Major
> Labels: pull-request-available
>
> Using from_pandas to convert decimals fails if encounters a value of
> {{None}}. For example:
> {code:java}
> In [1]: import pyarrow as pa
> ...: import pandas as pd
> ...: from decimal import Decimal
> ...:
> In [2]: s_dec = pd.Series([Decimal('3.14'), None])
> In [3]: pa.Array.from_pandas(s_dec, type=pa.decimal128(3, 2))
> ---------------------------------------------------------------------------
> ArrowInvalid Traceback (most recent call last)
> <ipython-input-3-2da56007a0da> in <module>()
> ----> 1 pa.Array.from_pandas(s_dec, type=pa.decimal128(3, 2))
> array.pxi in pyarrow.lib.Array.from_pandas()
> array.pxi in pyarrow.lib.array()
> error.pxi in pyarrow.lib.check_status()
> error.pxi in pyarrow.lib.check_status()
> ArrowInvalid: Error converting from Python objects to Decimal: Got Python
> object of type NoneType but can only handle these types: decimal.Decimal
> {code}
> The above error is raised when specifying decimal type. When no type is
> specified, a seg fault happens.
> This previously worked in 0.8.0.
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