[jira] [Updated] (ARROW-14156) [C++] StructArray::Flatten is incorrect in some cases

["Micah Kornfield (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-14156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Micah Kornfield updated ARROW-14156:
------------------------------------
    Summary: [C++] StructArray::Flatten is incorrect in some cases  (was: StructArray::Flatten is incorrect in some cases)

> [C++] StructArray::Flatten is incorrect in some cases
> -----------------------------------------------------
>
>                 Key: ARROW-14156
>                 URL: https://issues.apache.org/jira/browse/ARROW-14156
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 5.0.0
>            Reporter: Micah Kornfield
>            Priority: Major
>
> When trying to flatten a struct that has children that were sliced we see incorrect results.
>  
> {code:title=Bar.java|borderStyle=solid}
> import pyarrow as pa
> a = py.array([1,2,3])
> sliceds = a.slice(1)
> composed_struct = pa.StructArray.from_buffers(pa.struct([pa.field("a", sliceds.type)]), len(sliceds), [pa.array([True, False]).buffers()[1]], children=[sliceds])
> >>> composed_struct
> <pyarrow.lib.StructArray object at 0x7f5502a74880>
> -- is_valid:
>   [
>     true,
>     false
>   ]
> -- child 0 type: int64
>   [
>     2,
>     3
>   ]
> >>> composed_struct.flatten()
> [<pyarrow.lib.Int64Array object at 0x7f5502a74460>
> [
>   null,
>   null
> ]]
> {code}
>  
> I believe the problems is [here|https://github.com/apache/arrow/blob/8e43f23dcc6a9e630516228f110c48b64d13cec6/cpp/src/arrow/array/array_nested.cc#L572] the copy does not account for child array offset.



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