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Extend StmtRewriter with the ability to rewrite scalar subqueries in the select list into cross joins. Currently the subquery must pass plan-time checks to determine that it returns a single row which may miss cases that may be valid at runtime or with more complex evaluation of the predicate expressions in the planner. Support for correlated subqueries will be a follow on change. Testing: * Added new analyzer tests, updated previous subquery tests * test_queries.py::TestQueries::test_subquery * Added test_tpcds_q9 to e2e and planner tests Change-Id: Ibcf55d26889aa01d69bb85f18c9241dda095fb66 Reviewed-on: http://gerrit.cloudera.org:8080/16007 Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Tim Armstrong <tarmstrong@cloudera.com>