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https://issues.apache.org/jira/browse/ARROW-507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16213597#comment-16213597
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ASF GitHub Bot commented on ARROW-507:
--------------------------------------
GitHub user wesm opened a pull request:
https://github.com/apache/arrow/pull/1224
ARROW-507: [C++] Complete ListArray::FromArrays implementation, add unit
tests
In the event that the offsets array has nulls, this will backward-fill the
offsets to compute the correct value sizes.
I left one TODO which is to possibly create a new validity bitmap with the
last offset bit zero'd out (since the offsets array is one longer than the
length of the created array, and it must be non-null). I might go ahead and do
that
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wesm/arrow ARROW-507
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/arrow/pull/1224.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1224
----
commit d99c0dfa0dcd311f9ea7c80de8b1e47d3ba5824b
Author: Wes McKinney <[email protected]>
Date: 2017-10-20T20:43:32Z
Complete C++ implementation, unit test for ListArray::FromArrays, handling
of offsets with nulls
Change-Id: I89ef1dccbf101fcfdd56e3d7bc0d19e78842140d
commit 868a727a080afd0747c812fd082127afb57c1560
Author: Wes McKinney <[email protected]>
Date: 2017-10-21T00:36:26Z
Implement / add tests for ListArray.from_arrays in Python
Change-Id: I75e1123193d3a35ad788380405fc2d31e5511eba
----
> [C++/Python] Construct List container from offsets and values subarrays
> -----------------------------------------------------------------------
>
> Key: ARROW-507
> URL: https://issues.apache.org/jira/browse/ARROW-507
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++, Python
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Labels: pull-request-available
> Fix For: 0.8.0
>
>
> This is the inverse operation from flattening a list type into its child
> values (dropping the offsets)
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