jorgecarleitao opened a new issue #438:
URL: https://github.com/apache/arrow-datafusion/issues/438
AFAIK physical optimizers should be entirely optional and having them or not
must result in the same semantics.
However, removing `AddMergeExec` breaks THC 1 atm (all sorts, actually) with
```
Error: Internal("SortExec requires a single input partition")
```
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