public NumberExpression<Integer> length() {
        if (length == null) {
            length = Expressions.numberOperation(Integer.class, Ops.STRING_LENGTH, mixin);
        }
        return length;
    }
Create a {@code this.length()} expression

<p>Return the length of this String</p>

@return this.length()
@see java.lang.String#length()
querydsl-core/src/main/java/com/querydsl/core/types/dsl/StringExpression.java