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https://issues.apache.org/jira/browse/ARROW-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16429295#comment-16429295
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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_r179913262
##########
File path: cpp/src/arrow/ipc/feather-test.cc
##########
@@ -406,6 +406,89 @@ TEST_F(TestTableWriter, PrimitiveNullRoundTrip) {
}
}
+class TestTableWriterSlice : public TestTableWriter,
+ public
::testing::WithParamInterface<std::tuple<int, int>> {
+};
+
+TEST_P(TestTableWriterSlice, SliceRoundTrip) {
+ auto p = GetParam();
+ auto start = std::get<0>(p);
+ auto size = std::get<1>(p);
+
+ std::shared_ptr<RecordBatch> batch;
+ ASSERT_OK(MakeIntBatchSized(start * 2, &batch));
+ batch = batch->Slice(start, size);
+
+ ASSERT_OK(writer_->Append("f0", *batch->column(0)));
Review comment:
This part and below is still duplicated in the other two test cases. Do you
think you can factor that out, for example as a template function?
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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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