code: public void setKeySchema(java.util.Collection<KeySchemaElement> keySchema) {
          if (keySchema == null) {
              this.keySchema = null;
              return;
          }
  
          this.keySchema = new java.util.ArrayList<KeySchemaElement>(keySchema);
      }
docs: <p>
  The key attribute(s) of the stream's DynamoDB table.
  </p>
  
  @param keySchema
  The key attribute(s) of the stream's DynamoDB table.