siddharthteotia commented on issue #8755:
URL: https://github.com/apache/pinot/issues/8755#issuecomment-1134952819

   hey @Jackie-Jiang - there is another related issue here 
https://github.com/apache/pinot/issues/7870
   
   I had discussed the point (4) in that issue with @somandal  and we are 
planning to do it in one of the two ways:
   
   - Support for general purpose compression on dictionary encoded columns. So, 
for a dictionary encoded column it is not absolutely necessary to dictionary 
encode the forward index as well. The raw data in forward index can be 
compressed using LZ4 / SNAPPY etc just like we would have done for a 
noDictionary column
   - The other way we are thinking is to also add support for no forward index.
   
   I think both approaches can be implemented and will benefit the case where 
forward index can be huge (like the MV column example in my issue) and the 
column is only used in filtering so ok to have the forward index compressed or 
not have it at all. 


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