AngersZhuuuu commented on issue #26437: [SPARK-29800][SQL] Rewrite non-correlated subquery use ScalaSubquery to optimize perf URL: https://github.com/apache/spark/pull/26437#issuecomment-570988937 > I also noticed that in related docs (in Spark code or not), Exists expression seems to be correlated condition. > > For example, the `Exists` doc said `The [[Exists]] expression checks if a row exists in a subquery given some correlated condition.`. > > Although uncorrelated exist query definitely work now and we also have such query in tests like `exist-basic.sql`. > > Maybe we should also update the doc. Updated what you have mentioned.
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