Modifying query components

query.js

function read(query, user, request) {
    var queryComponents = query.getComponents();
    /*
    { filters: null,
      selections: [],
      projection: null,
      ordering: {},
      skip: null,
      take: 50,
      table: 'test',
      context: undefined,
      includeTotalCount: false,
      version: 1 } 
    */
    queryComponents.selections = ['propertyA', 'propertyB'];
    queryComponents.skip = 100;
    query.setComponents(queryComponents);
    
    request.execute();
}