I just submitted SPARK-23945 <https://issues.apache.org/jira/browse/SPARK-23945> but wanted to double check here to make sure I didn't miss something fundamental.
Correlated subqueries are tracked at a high level in SPARK-18455 <https://issues.apache.org/jira/browse/SPARK-18455>, but it's not clear to me whether they are "design-appropriate" for the DataFrame API. Are correlated subqueries a thing we can expect to have in the DataFrame API? Nick
