himanshug commented on issue #9689: groupBy query: limit push down to segment 
scan is poor performance
URL: https://github.com/apache/druid/issues/9689#issuecomment-613672659
 
 
   >  ... groupBy code to use Memory instead of ByteBuffer (#9308, #9314; see 
also MemoryBenchmark) partially motivated by performance. If we moved this part 
too it should help with initialization speed.
   
   thanks for pointing those out .  from a quick look, it looks like  we should 
just delete `ByteBufferHashTable` and replace all usage by 
`MemoryOpenHashTable` which is a clear winner. Do you see any reason for 
keeping `ByteBufferHashTable` around anywhere ?
   
   agree with  everything, all of them could/should be independently done.
   

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