public LookbackQuery withLookbackQueryPostAggregations(Collection<PostAggregation> postAggregations){
  return new LookbackQuery(dataSource,granularity,filter,aggregations,postAggregations,intervals,context,false,lookbackOffsets,lookbackPrefixes,having,limitSpec);
}

public LookbackQuery withLookbackQueryPostAggregations ( Collection < PostAggregation > postAggregations ) { return new LookbackQuery ( dataSource , granularity , filter , aggregations , postAggregations , intervals , context , false , lookbackOffsets , lookbackPrefixes , having , limitSpec ) ; }
update the postaggregations of the lookbackquery ( outer query ) .
