[rql2sql] closes #1832859: fake HAVING terms w/ EXISTS terms there are cases where we want to use the HAVING trick on terms that should belong to an EXISTS subquery. Currently , this causes bad sql. We should fix that until we've a proper rql grammar avoiding the need for this trick. Notice at some point, we may want **actuall** HAVING clauses and GROUPBY used in EXISTS subquery, but that's another story.

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