Fix test cases to correctly construct TVE in having clause

Author: chenboy

test/codegen/group_by_translator_test.cpp

@@ -236,7 +236,7 @@ TEST_F(GroupByTranslatorTest, AggregationWithOutputPredicate) {
 
   // 5) The predicate on the average aggregate
   auto *x_exp =
-      new expression::TupleValueExpression(type::TypeId::DECIMAL, 1, 0);
+      new expression::TupleValueExpression(type::TypeId::DECIMAL, 0, 1);
   auto *const_50 = new expression::ConstantValueExpression(
       type::ValueFactory::GetDecimalValue(50.0));
   ExpressionPtr x_gt_50{

test/codegen/query_cache_test.cpp

@@ -145,7 +145,7 @@ class QueryCacheTest : public PelotonCodeGenTest {
 
     // 5) The predicate on the average aggregate
     auto *x_exp =
-        new expression::TupleValueExpression(type::TypeId::DECIMAL, 1, 0);
+        new expression::TupleValueExpression(type::TypeId::DECIMAL, 0, 1);
     auto *const_50 = new expression::ConstantValueExpression(
         type::ValueFactory::GetDecimalValue(50.0));
     std::unique_ptr<expression::AbstractExpression> x_gt_50{