DynamoDB: Check for children more efficiently (#2722)
DynamoDB: Check for children more efficiently (#2722)

* Check for children more efficiently

* Wrap comments to a width of 80

Caiyeon/vault,kingland/vault,lirao/vault,wjam/vault,hartsock/vault,MonsantoCo/vault,wjam/vault,kingland/vault,hashicorp/vault,tallpauley/vault,kingland/vault,quixoten/vault,rnaveiras/vault,rnaveiras/vault,lemondrank/vault,naunga/vault,hashicorp/vault,lemondrank/vault,mgk/vault,hartsock/vault,tallpauley/vault,Caiyeon/vault,kingland/vault,joelthompson/vault,Aloomaio/vault,joelthompson/vault,hashicorp/vault,deverton/hashicorp-vault,hartsock/vault,MonsantoCo/vault,hartsock/vault,hashicorp/vault,kingland/vault,mgk/vault,quixoten/vault,hashicorp/vault,deverton/hashicorp-vault,mgk/vault,Aloomaio/vault,Aloomaio/vault,joelthompson/vault,quixoten/vault,quixoten/vault,rnaveiras/vault,joelthompson/vault,hashicorp/vault,rnaveiras/vault,Aloomaio/vault,rnaveiras/vault,hartsock/vault,naunga/vault,mgk/vault,lirao/vault