Method Alias

src/main/java/com/sql/parse/model/Alias.java:16–20

(String leftExpression, String rightExpression, boolean useAs)

    private String rightExpression;

    public Alias(String leftExpression, String rightExpression, boolean useAs) {
        this.leftExpression = leftExpression;
        this.rightExpression = rightExpression;
        this.useAs = useAs;
    }

    public Alias(String leftExpression) {
        this.leftExpression = leftExpression;