@Override
    public BooleanExpression coalesce(Boolean arg) {
        Coalesce<Boolean> coalesce = new Coalesce<Boolean>(getType(), mixin);
        coalesce.add(arg);
        return coalesce.asBoolean();
    }
Create a {@code coalesce(this, arg)} expression

@param arg additional argument
@return coalesce
querydsl-core/src/main/java/com/querydsl/core/types/dsl/BooleanExpression.java