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From Micah Kornfield <emkornfi...@gmail.com>
Subject Re: ArrowNotImplementedError: No cast implemented from decimal(2,2) to decimal(12,2)
Date Fri, 25 Oct 2019 05:29:57 GMT
I filed:
https://issues.apache.org/jira/browse/ARROW-6990
https://issues.apache.org/jira/browse/ARROW-6989

On Thu, Oct 24, 2019 at 10:02 PM Micah Kornfield <emkornfield@gmail.com>
wrote:

> Hi Dima,
> Could you provide a minimal code sample for how you generated the error
> (the example below is a good one)?
>
> It sounds like it would be a good feature anyways to be able to cast
> between the decimals like this.  Could you open a JIRA for this (
> https://issues.apache.org/jira
> <https://issues.apache.org/jira/secure/Dashboard.jspa>)
>
> Thanks,
> Micah
>
> On Thu, Oct 24, 2019 at 5:47 AM Dima Fomin <datagy@yandex.ru> wrote:
>
>> Hello!
>> First of all thank you very much for your efforts on Apache Arrow! This
>> looks very useful and prominent tech to be able use it in self-BI area.
>>
>> I faced such issues - get Subj Error
>>
>> ArrowNotImplementedError: No cast implemented from decimal(2,2) to
>> decimal(12,2)
>>
>> when trying to *pyarrow.Table.from_batches* array of values defined in
>> schema as *pyarrow.decimal128(12,2)*.
>>
>> Which values are in fact column of
>> *sqlAlchemy.sql.sqltypes.DECIMAL()="DECIMAL(precision=12,scale=2)"*
>> values, which I map in schema like this *pyarrow.decimal128(12,2)*.
>>
>> What could be a reason of issue?
>> Could it be that somehow declared decimal type of data is reduced to
>> minimum value which met in data? :/
>>
>> With best regards,
>> Dima Fomin
>>
>

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