[jira] [Comment Edited] (ARROW-3329) [Python] Error casting decimal(38, 4) to int64

["Jacek Pliszka (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-3329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17075915#comment-17075915 ] 

Jacek Pliszka edited comment on ARROW-3329 at 4/5/20, 7:57 PM:
---------------------------------------------------------------

Added python tests to my branch - waiting for tests to finish - when they are OK I will raise pull request.

[https://github.com/JacekPliszka/arrow/tree/ARROW-3329]

 

However there are 3 issues left that I would like to postpone for later:

* python cast does not distinguish between truncation and overflow 
* no overflow implemented for decimal to decimal cast
* cast while constructing is still failing

But overall I believe it works fine so I am for including it in 0.17.0 and fixing above later.

 


was (Author: jacek.pliszka):
Added some corrections to my branch - waiting for tests to finish - when they are OK I will raise pull request.

https://github.com/JacekPliszka/arrow/tree/ARROW-3329

 

> [Python] Error casting decimal(38, 4) to int64
> ----------------------------------------------
>
>                 Key: ARROW-3329
>                 URL: https://issues.apache.org/jira/browse/ARROW-3329
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>         Environment: Python version : 3.6.5
> Pyarrow version : 0.10.0
>            Reporter: Kavita Sheth
>            Assignee: Jacek Pliszka
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 7h 20m
>  Remaining Estimate: 0h
>
> Git issue LInk : https://github.com/apache/arrow/issues/2627
> I want to cast pyarrow table column from decimal(38,4) to int64.
> col.cast(pa.int64())
> Error:
>  File "pyarrow/table.pxi", line 443, in pyarrow.lib.Column.cast
>  File "pyarrow/error.pxi", line 89, in pyarrow.lib.check_status
>  pyarrow.lib.ArrowNotImplementedError: No cast implemented from decimal(38, 4) to int64
> Python version : 3.6.5
>  Pyarrow version : 0.10.0
> is it not implemented yet or I am not using it correctly? If not implemented yet, then any work around to cast columns?



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