gaodayue opened a new pull request #1698: refactor RowsetReaderContext
URL: https://github.com/apache/incubator-doris/pull/1698
 
 
   This PR refactors RowsetReaderContext and adds more comments to help 
developers understand the read path.
   
   Tha main changes are
   
   - move index stream cache stuff (`is_using_cache` and `lru_cache`) out of 
RowsetReaderContext because that's specific to alpha rowset and whether to use 
that cache  can be determined solely by `reader_type`
   - `preaggregation` is replaced with `need_ordered_result` to improve code 
understandability and to simplify RowsetReader implementations

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