code: public void setPartitionKeys(java.util.Collection<ResponsePartitionKey> partitionKeys) {
          if (partitionKeys == null) {
              this.partitionKeys = null;
              return;
          }
  
          this.partitionKeys = new java.util.ArrayList<ResponsePartitionKey>(partitionKeys);
      }
docs: <p>
  If <code>PartitionBy</code> was present in the request, <code>PartitionKeys</code> contains the breakdown of
  dimension keys by the specified partitions.
  </p>
  
  @param partitionKeys
  If <code>PartitionBy</code> was present in the request, <code>PartitionKeys</code> contains the breakdown
  of dimension keys by the specified partitions.