sandugood commented on PR #1853:
URL: 
https://github.com/apache/datafusion-ballista/pull/1853#issuecomment-4717625526

   Refactored the code:
   1. In the .proto spec now we are sending the `PartitionLocation` along with 
a map of `ExecutorMetadata` (used by `ShuffleReaderPartition`). So we can now 
transfer a `Vec<>` of locations and access the executor's metadata via its `id`.
   2. On the native side - added `ExecutorMetadata` in the `PartitionLocation` 
behind an `Arc<>` to avoid heavy copying.
   3. Made parts of the .proto spec in the `ExecutorMetadata` optional


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