clintropolis commented on issue #7588: multi-value string column support for expressions URL: https://github.com/apache/incubator-druid/pull/7588#issuecomment-500618982 There is currently a few missing pieces for this functionality to work with Druid ingestion transformations, since there are a handful of places that lack the value coercion that is happening in the expression selectors on the query side. I'm trying to hunt down all the areas that need fixed up so everything works as expected, and depending on how large of a change it is and how far reviewed this PR is before I get it finished, I might prefer to do as a follow-up PR.
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