public NumberExpression<T> abs() {
        if (abs == null) {
            abs = Expressions.numberOperation(getType(), MathOps.ABS, mixin);
        }
        return abs;
    }
Create a {@code abs(this)} expression

<p>Returns the absolute value of this expression</p>

@return abs(this)
querydsl-core/src/main/java/com/querydsl/core/types/dsl/NumberExpression.java