ccaominh opened a new pull request #8373: Speed up ExpressionSelectors.makeExprEvalSelector URL: https://github.com/apache/incubator-druid/pull/8373 ### Description Addresses performance bottlenecks observed when running a search query with an expression filter and granularity set to none by caching and changing streams to for-loops. After changes, the query was observed to run 2-3x faster. Also fixes various IntelliJ inspection warnings. <hr> This PR has: - [x] been self-reviewed. - [x] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
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