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https://issues.apache.org/jira/browse/ARROW-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16428577#comment-16428577
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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_r179814535
##########
File path: cpp/src/arrow/ipc/feather-test.cc
##########
@@ -406,6 +406,125 @@ TEST_F(TestTableWriter, PrimitiveNullRoundTrip) {
}
}
+TEST_F(TestTableWriter, SliceRoundTrip) {
+ std::shared_ptr<RecordBatch> batch;
+ ASSERT_OK(MakeIntBatchSized(300, &batch));
+ batch = batch->Slice(100, 100);
+
+ ASSERT_OK(writer_->Append("f0", *batch->column(0)));
+ ASSERT_OK(writer_->Append("f1", *batch->column(1)));
+ Finish();
+
+ std::shared_ptr<Column> col;
+ ASSERT_OK(reader_->GetColumn(0, &col));
+ ASSERT_TRUE(col->data()->chunk(0)->Equals(batch->column(0)));
+ ASSERT_EQ("f0", col->name());
+
+ ASSERT_OK(reader_->GetColumn(1, &col));
+ ASSERT_TRUE(col->data()->chunk(0)->Equals(batch->column(1)));
+ ASSERT_EQ("f1", col->name());
+}
+
+TEST_F(TestTableWriter, SliceStringsRoundTrip) {
+ std::shared_ptr<RecordBatch> batch;
+ ASSERT_OK(MakeStringTypesRecordBatchWithNulls(&batch, false));
+ batch = batch->Slice(320, 30);
+
+ ASSERT_OK(writer_->Append("f0", *batch->column(0)));
+ ASSERT_OK(writer_->Append("f1", *batch->column(1)));
+ Finish();
+
+ std::shared_ptr<Column> col;
+ ASSERT_OK(reader_->GetColumn(0, &col));
+ SCOPED_TRACE(col->data()->chunk(0)->ToString() + "\n" +
batch->column(0)->ToString());
Review comment:
Yes(ish) It helps give a helpfull message when the test fails.
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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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