[GitHub] [incubator-pinot] Jackie-Jiang opened a new pull request #4363: When initializing mutable dictionary, preserve 20% buffer for cardinality to reduce the chance of re-sizing the dictionary

[GitBox <gi...@apache.org>]

Jackie-Jiang opened a new pull request #4363: When initializing mutable dictionary, preserve 20% buffer for cardinality to reduce the chance of re-sizing the dictionary
URL: https://github.com/apache/incubator-pinot/pull/4363
 
 
   The current off-heap mutable dictionary is designed to hold all values in a single buffer
   If the buffer allocated is just enough for the cardinality estimation, there are quite high possibility that the dictionary needs to be expanded, which will impact performance
   In order to reduce the chance of re-sizing the dictionary, preserve 20% buffer for cardinality

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