[GitHub] [arrow] westonpace commented on issue #32991: [C++] Add ordering information to exec batches

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on issue #32991:
URL: https://github.com/apache/arrow/issues/32991#issuecomment-1419959805

   I plan to start working on this task.  However, it is quite large.  I plan on breaking it up into the following tasks:
   
    - [ ] Add batch index to ExecNode, Create a fetch node (this will serve as an example of how a batch index can work)
    - [ ] Add batch index to the scanner
    - [ ] Add the concept of "ordering" to an exec node, reject non-sensible plans
    - [ ] Update existing nodes to respect ordering and batch index (at this point "fetch" will be usable in larger plans)
    - [ ] Add bindings for fetch to substrait consumer
    - [ ] Add an order-by node which can modify an ordering
    - [ ] Deprecate old DeclarationToXyz methods


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