ccaominh opened a new pull request #9488: Match GREATEST/LEAST function behavior to other DBs URL: https://github.com/apache/druid/pull/9488 ### Description Change the behavior of the GREATEST / LEAST functions to be similar to how it is implemented in other databases (as functions instead of aggregators). The GREATEST/LEAST functions are not in the SQL standard, but users will expect behavior similar to what other databases provide. <hr> This PR has: - [x] been self-reviewed. - [x] added documentation for new or modified features or behaviors. - [x] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links. - [x] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader. - [x] added unit tests or modified existing tests to cover new code paths.
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