--- FAIL: TestLogic/fakedist-disk/aggregate/string_agg (0.61s)
                logic.go:1706:
                    testdata/logic_test/aggregate:2080: SELECT a, b, count(*) FROM ab RIGHT JOIN tab ON b=col2 GROUP BY a
                    expected:
                        NULL  NULL  4
                        4     7     2
                    but found (query options: "rowsort" -> ignore the following ordering of rows) :
                        NULL  NULL  2
                        NULL  NULL  2
                        4     7     2