How can I merge two grapqhql query into one query programmaticly?

[physicsLoveJava]

Suppose I have two query as below
query1

query  {
  modelA {
    attr1 
    attr2   
  }
}

query2

query  {
  modelA {
    attr3
  }
}

I want to get merge query as like
mergeQuery

query  {
  modelA {
    attr1 
    attr2 
    attr3
  }
}

just want know this like of thing can be fullfill by program?