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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