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


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