code: public QueryBuilder intersectAll() {
          this.firstQuery = query();
          this.firstQuerySetOperation = Operation.INTERSECT;
          this.firstQueryAll = true;
          clear(false);
          return this;
      }
docs: Perform an INTERSECT ALL between the query as defined prior to this method and the query that will be defined following
  this method.
  
  @return this builder object, for convenience in method chaining