clintropolis commented on issue #9425: allow optimization of single multi-value 
column input expr with repeated identifier
URL: https://github.com/apache/druid/pull/9425#issuecomment-591793203
 
 
   >Can you think of a way to add a test? (The results don't change, we were 
just missing a performance optimization. We don't have a perf test framework 
yet, but even without one, any ideas?)
   
   It is pretty ugly, but I added a test to confirm that 
`SingleStringInputDimensionSelector` is chosen over 
`MultiValueExpressionDimensionSelector` for selectors with capabilities that 
are compatible with the optimization.

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