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https://issues.apache.org/jira/browse/ARROW-969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16357431#comment-16357431
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ASF GitHub Bot commented on ARROW-969:
--------------------------------------

wesm commented on a change in pull request #1574: ARROW-969: [C++] Add 
add/remove field functions for RecordBatch
URL: https://github.com/apache/arrow/pull/1574#discussion_r167036590
 
 

 ##########
 File path: cpp/src/arrow/record_batch.cc
 ##########
 @@ -78,6 +79,52 @@ class SimpleRecordBatch : public RecordBatch {
 
   std::shared_ptr<ArrayData> column_data(int i) const override { return 
columns_[i]; }
 
+  Status AddColumn(int i, const std::shared_ptr<Field>& field,
+                   const std::shared_ptr<ArrayData>& column,
+                   std::shared_ptr<RecordBatch>* out) const override {
+    if (i < 0 || i > num_columns() + 1) {
 
 Review comment:
   I think this should be `i > num_columns()`. This is also a bug in 
`SimpleTable::AddColumn`. Can you add a test where `i == num_columns()`?

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> [C++/Python] Add add/remove field functions for RecordBatch
> -----------------------------------------------------------
>
>                 Key: ARROW-969
>                 URL: https://issues.apache.org/jira/browse/ARROW-969
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++, Python
>            Reporter: Wes McKinney
>            Assignee: Panchen Xue
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.9.0
>
>
> Analogous to the Table equivalents



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