cloud-fan commented on issue #23171: [SPARK-26205][SQL] Optimize In for bytes, shorts, ints URL: https://github.com/apache/spark/pull/23171#issuecomment-467860408 > the main idea of `InSet` was to optimize cases when the list of values is long rather than to optimize cases when all values are literals. "all values are literals" is a pre-condition. If some values are attributes, we can't use hash set no matter how long the list of values is. But I'm fine to add the switch optimization in `InSet`, we can rename it to `OptimizedIn` later.
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