glasser commented on issue #7243: stringFirst/stringLast crashes at aggregation time URL: https://github.com/apache/incubator-druid/issues/7243#issuecomment-476384529 I honestly couldn't figure out what the purpose of the `StringFirstFoldingAggregatorFactory` class was. For a short term fix (to fix the bug, without the refactors you're suggesting), is the suggestion that `StringFirstFoldingAggregatorFactory.makeAggregateCombiner` should have return `this`?
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