clintropolis opened a new pull request #8957: modify multi-value automatic expression transformation URL: https://github.com/apache/incubator-druid/pull/8957 ### Description This PR modifies behavior of multi-value expression automatic transformations to not treat re-use of the same input as a candidate for cartesian mapping, functionally reverting #8019 pending the outcome of the discussion in #8947. <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. - [x] added unit tests or modified existing tests to cover new code paths.
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