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https://issues.apache.org/jira/browse/ARROW-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430299#comment-16430299
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ASF GitHub Bot commented on ARROW-2328:
---------------------------------------
Adriandorr 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_r180032970
##########
File path: cpp/src/arrow/ipc/test-common.h
##########
@@ -223,15 +223,17 @@ Status MakeRandomBinaryArray(int64_t length, bool
include_nulls, MemoryPool* poo
if (include_nulls && values_index == 0) {
RETURN_NOT_OK(builder.AppendNull());
} else {
- const std::string& value = values[values_index];
+ const std::string value =
+ i < int64_t(values.size()) ? values[values_index] :
std::to_string(i);
Review comment:
The original random strings were not very random, just a repetition of the
same few strings. I admit the new ones aren't very random either, in particular
there are no repetitions which you would expect in a in real data. I probably
should have added a new method (MakeRangeBinaryArray?).
Of course you don't want true random data either in a test.
If I revert the change I wouldn't be confident that my tests are still
testing anything, the repetition might just align in a lucky pattern.
You ok with leaving it, I think it is better than the previous code?
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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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