2.1.2 Input and output stream queues

The input stream queue is the path through which the input stream data is received. The input stream queue is coded in the query using CQL statements for reading streams. For details about the CQL code used to define streams, see 2.2.1(1) Defining a stream (REGISTER STREAM clause).

The output stream queue is the path through which the processing results (stream data) of the stream data processing engine are output. The output stream queue is coded in the query using CQL statements for outputting stream data. For details about the CQL code used to output the processing results of a query as stream data, see 2.2.2(3) Stream operations (outputting the data processing results).

The type of stream data that passes through the input stream queue is called an input stream, and the type of stream data that passes through the output stream queue is called an output stream.