What is the output type when performing a KStream-to-GlobalKTable join?

What is the output type when performing a KStream-to-GlobalKTable join?

• A. KTable
• B. GlobalKTable
• C. KStream
• D. WindowedKStream

Answer: (C)

Joining a KStream with a GlobalKTable produces a stream of enriched records. The process looks up the corresponding value in the GlobalKTable for each incoming record in the KStream by its key and combines the stream value with the table value using a ValueJoiner. Since you’re starting from a continuous stream, the result remains a stream, not a table. That’s why the output type is a KStream, carrying the joined value for each input record. If you were applying explicit windowing, you might see a WindowedKStream, but without windowing the default outcome is a standard KStream.

Joining a KStream with a GlobalKTable produces a stream of enriched records. The process looks up the corresponding value in the GlobalKTable for each incoming record in the KStream by its key and combines the stream value with the table value using a ValueJoiner. Since you’re starting from a continuous stream, the result remains a stream, not a table. That’s why the output type is a KStream, carrying the joined value for each input record. If you were applying explicit windowing, you might see a WindowedKStream, but without windowing the default outcome is a standard KStream.