func NewExpr(name, source string, expr expression.Expr) *Expr {
	return &Expr{
		source: source,
		Expr:   expr,
		Name:   name,
	}
}
NewExpr creates a new expression
package core
import (
	"github.com/project-flogo/core/data/expression"
)
type Expr struct {
	source string
	expression.Expr
	Name string
}