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https://issues.apache.org/jira/browse/ARROW-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16427011#comment-16427011
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ASF GitHub Bot commented on ARROW-2328:
---------------------------------------
pitrou commented on a change in pull request #1784: ARROW-2328: [C++] Fixed and
unit tested feather writing with slice
URL: https://github.com/apache/arrow/pull/1784#discussion_r179479896
##########
File path: cpp/src/arrow/ipc/feather.cc
##########
@@ -75,6 +75,43 @@ static Status WritePadded(io::OutputStream* stream, const
uint8_t* data, int64_t
return Status::OK();
}
+static Status WritePaddedWithOffset(io::OutputStream* stream, const uint8_t*
data,
+ int64_t bit_offset, const int64_t length,
+ int64_t* bytes_written) {
+ data = data + bit_offset / 8;
+ uint8_t bit_shift = static_cast<uint8_t>(bit_offset % 8);
Review comment:
Is the cast to int8 necessary here? (for performance perhaps?)
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> Writing a slice with feather ignores the offset
> -----------------------------------------------
>
> Key: ARROW-2328
> URL: https://issues.apache.org/jira/browse/ARROW-2328
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 0.8.0
> Reporter: Adrian
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.10.0
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> Writing a slice from row n of length m of an array to feather would write the
> first m rows, instead of the rows starting at n.
> The null bitmap also ends up misaligned. Also tested and fixed in the pull
> request below.
> I've created a pull request with tests and fix here:
> [Pullrequest#1766|https://github.com/apache/arrow/pull/1766]
>
>
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