glasser commented on issue #7243: stringFirst/stringLast crashes at aggregation time URL: https://github.com/apache/incubator-druid/issues/7243#issuecomment-476435605 Sure, I guess the problem is I can write tests that validate that the particular classes do what I wrote them to do, but I'm not sure how to write tests that validate that all the different components of aggregating work together properly with the right types, especially as I don't really understand this corner of Druid well. The difference between "does the code do what I think it does" and "does the code implement the right thing".
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