richardstartin opened a new pull request #8139:
URL: https://github.com/apache/pinot/pull/8139


   Aggregation function aggregate as `double` to avoid numeric overflow, but 
converting blocks to `double[]` too soon has two drawbacks:
   * `double[]` are larger than `float[]` and `int[]` and this may result in 
twice the footprint on heap when these arrays are retained by the 
`DataBlockCache`
   * If the values are read directly from a `ForwardIndexReader`, reading 
`int`/`long`/`float` values as `double` prevents autovectorization, resulting 
in a performance penalty.


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