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_r179913300

 File path: cpp/src/arrow/ipc/test-common.h
 @@ -244,18 +246,22 @@ Status 
MakeStringTypesRecordBatch(std::shared_ptr<RecordBatch>* out) {
   // Quirk with RETURN_NOT_OK macro and templated functions
-    auto s = MakeRandomBinaryArray<StringBuilder, char>(length, true, pool, 
+    auto s = MakeRandomBinaryArray<StringBuilder, char>(length, with_nulls, 
pool, &a0);
-    auto s = MakeRandomBinaryArray<BinaryBuilder, uint8_t>(length, true, pool, 
+    auto s = MakeRandomBinaryArray<BinaryBuilder, uint8_t>(length, with_nulls, 
pool, &a1);
   *out = RecordBatch::Make(schema, length, {a0, a1});
   return Status::OK();
+Status MakeStringTypesRecordBatchWithoutNulls(std::shared_ptr<RecordBatch>* 
out) {
 Review comment:
   Why is it called "...WithoutNulls" if it passes `with_nulls = true`?

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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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