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We don't support the SQL `EXISTS` keyword. It looks like: ``` SELECT * FROM test WHERE EXISTS (SELECT * FROM foo WHERE test.id = foo.id) ``` It is basically a `JOIN` that doesn't return columns. Since we don't support `JOIN`, we don't support `EXISTS`. This PR improves the error message from "unresolved blah blah blah" to "EXISTS is not yet supported". relates elastic/x-pack-elasticsearch#3176 Original commit: elastic/x-pack-elasticsearch@548d57c8c1