public WHERE exists(boolean condition, IQuery query) {
        if (condition) {
            ((BaseWrapper) query).sharedParameter(wrapper);
            wrapper.data().apply(currOp, EMPTY_COLUMN, EXISTS, query.data().sql(false));
        }
        return this.and;
    }
use {@link #notExists(Predicate, String, Object...)}
fluent-mybatis/src/main/java/cn/org/atool/fluent/mybatis/segment/WhereBase.java