ccaominh commented on issue #9278: Speed up joins on indexed tables with string 
keys
URL: https://github.com/apache/druid/pull/9278#issuecomment-579887920
 
 
   > How do these numbers compare to the standard lookup case?
   
   Lookups are about 5x faster:
   
   ```
   Benchmark                               (columnCacheSizeBytes)  Score   
Error  Units
   lookupVirtualColumnStringKey                                 0  3.374 ± 
0.065  ms/op
   lookupVirtualColumnStringKey                             16384  3.364 ± 
0.054  ms/op
   lookupVirtualColumnStringKeyWithFilter                       0  4.553 ± 
0.114  ms/op
   lookupVirtualColumnStringKeyWithFilter                   16384  5.529 ± 
0.305  ms/op
   ```

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