// Consider:// SEL_1 (int) SEL_2 (int) SEL_3 (double)// If we first merge SEL_1 and SEL_2 into a UNION_1, and then merge UNION_1// with SEL_3 to get UNION_2, then no SelectOperator will be inserted. Hence error// will happen afterwards. The solution here is to insert one after UNION_1, which// cast int to double.
In 'SemanticAnalyzer.java', we resolve it only if the engine is spark or tez. But with MR engine, I also encounter this problem. Would you give me some advices about this problem. Thanks~
