[GitHub] [druid] clintropolis opened a new pull request #9836: low hanging fruit - presize hash map for DruidSegmentReader

[GitBox]

clintropolis opened a new pull request #9836:
URL: https://github.com/apache/druid/pull/9836


   I don't have an after flame graph, but here is the before:
   
   <img width="1638" alt="Screen Shot 2020-05-06 at 3 00 24 PM" 
src="https://user-images.githubusercontent.com/1577461/81259389-b3cf9100-8fec-11ea-8e8c-75a64078035c.png";>
   
   where we are spending time resizing the `HashMap` that we don't need to be 
when we know the approximate size up front.


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