[jira] [Updated] (ARROW-12677) [C++] Add a mask argument to pyarrow.StructArray.from_arrays

["Weston Pace (Jira)" <ji...@apache.org>]

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

Weston Pace updated ARROW-12677:
--------------------------------
    Summary: [C++] Add a mask argument to pyarrow.StructArray.from_arrays  (was: Add a mask argument to pyarrow.StructArray.from_arrays)

> [C++] 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
>            Priority: Trivial
>
> 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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