Converts the binary errorRecord value to string format.
recordDataToString (string sourceStreamName, binary errorRecord)
The sourceStreamName is a string that provides the name of the stream from which the error record originated. This should always be the sourceStreamName field of an error stream. Specifying the name of another stream (such as the error stream) can cause a fatal error due to a schema mismatch. If this argument doesn't point to an existing stream, recordDataToString returns a NULL after setting an error flag to indicate that a bad argument was specified.