boolean canCreateContext() {
    return (CREATE_FLAG & flag) == CREATE_FLAG;
  }
An existing retry-call is required to join it.
<b>In other words:</b> While this method does not being executed as a retry-call, it can be called only when 
there is a {@link SqlRetry} annotated method upper in the callstack.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/retry/RetryPropagation.java