public NumberExpression<T> negate() {
        if (negation == null) {
            negation = Expressions.numberOperation(getType(), Ops.NEGATE, mixin);
        }
        return negation;
    }
Create a {@code this * -1} expression

<p>Get the negation of this expression</p>

@return this * -1
querydsl-core/src/main/java/com/querydsl/core/types/dsl/NumberExpression.java