[jira] [Commented] (ARROW-2033) pa.array() doesn't work with iterators

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-2033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16339231#comment-16339231 ] 

ASF GitHub Bot commented on ARROW-2033:
---------------------------------------

pitrou opened a new pull request #1513: ARROW-2033: [Python] Fix pa.array() with iterator input
URL: https://github.com/apache/arrow/pull/1513
 
 
   Iterator (not iterable) input was broken with pa.array() unless both type and size were explicitly passed.

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> pa.array() doesn't work with iterators
> --------------------------------------
>
>                 Key: ARROW-2033
>                 URL: https://issues.apache.org/jira/browse/ARROW-2033
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.9.0
>            Reporter: Antoine Pitrou
>            Priority: Minor
>              Labels: pull-request-available
>
> pa.array handles iterables fine, but not iterators if size isn't passed:
> {code:java}
> >>> arr = pa.array(range(5))
> >>> arr
> <pyarrow.lib.Int64Array object at 0x7f4652a05318>
> [
>   0,
>   1,
>   2,
>   3,
>   4
> ]
> >>> arr = pa.array(iter(range(5)))
> >>> arr
> <pyarrow.lib.NullArray object at 0x7f4633c1d638>
> [
>   NA,
>   NA,
>   NA,
>   NA,
>   NA
> ]
> {code}
> This is because InferArrowSize() first exhausts the iterator.



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