gianm opened a new pull request #9181: Speed up String first/last aggregators when folding isn't needed. URL: https://github.com/apache/druid/pull/9181 Examines the value column, and disables fold checking via a needsFoldCheck flag if that column can't possibly contain SerializableLongStringPairs. This is helpful because it avoids calling getObject on the value selector when unnecessary; say, because the time selector didn't yield an earlier or later value.
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