presto-main/src/main/java/io/prestosql/sql/analyzer/ExpressionAnalyzer.java/Visitor/visitComparisonExpression
class Visitor:        @Override
        protected Type visitComparisonExpression(ComparisonExpression node, StackableAstVisitorContext<Context> context)
        {
            OperatorType operatorType = OperatorType.valueOf(node.getOperator().name());
            return getOperator(context, node, operatorType, node.getLeft(), node.getRight());
        }