maropu commented on issue #26997: [SPARK-30343][SQL] Skip unnecessary checks in RewriteDistinctAggregates URL: https://github.com/apache/spark/pull/26997#issuecomment-570178689 Yea, actually, this is minor optimization and this change has less impact on performance improvements. But, since aggregates are pretty-common queries, I think it is worth avoid unnecessary checks as much as possible. Also, this fix has no harm on performance.
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