[jira] [Resolved] (ARROW-12677) [Python] Add a mask argument to pyarrow.StructArray.from_arrays

["David Li (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-12677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Li resolved ARROW-12677.
------------------------------
    Fix Version/s: 5.0.0
       Resolution: Fixed

Issue resolved by pull request 10272
[https://github.com/apache/arrow/pull/10272]

> [Python] Add a mask argument to pyarrow.StructArray.from_arrays
> ---------------------------------------------------------------
>
>                 Key: ARROW-12677
>                 URL: https://issues.apache.org/jira/browse/ARROW-12677
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: &res
>            Assignee: Weston Pace
>            Priority: Trivial
>              Labels: pull-request-available
>             Fix For: 5.0.0
>
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> The python API for creating StructArray from a list of array doesn't allow to pass a missing value mask. 
> At the moment the only way to create a StructArray with missing value is to use `pyarrow.array` and passing a vector of tuple.
> {code:python}
> >>> pyarrow.array(
>     [
>         None,
>         (1, "foo"),
>     ],
>     type=pyarrow.struct(
>         [pyarrow.field('col1', pyarrow.int64()), pyarrow.field("col2", pyarrow.string())]
>     )
> )
> -- is_valid:
>   [
>     false,
>     true
>   ]
> -- child 0 type: int64
>   [
>     0,
>     1
>   ]
> -- child 1 type: string
>   [
>     "",
>     "foo"
>   ]
> >>> pyarrow.StructArray.from_arrays(
>     [
>         [None, 1],
>         [None, "foo"]
>     ],
>     fields=[pyarrow.field('col1', pyarrow.int64()), pyarrow.field("col2", pyarrow.string())]
> )
> -- is_valid: all not null
> -- child 0 type: int64
>   [
>     null,
>     1
>   ]
> -- child 1 type: string
>   [
>     null,
>     "foo"
>   ]
> {code}
> The C++ API allows it, so it should be easy to add.
> see [this so question|https://stackoverflow.com/questions/67417110/]



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