Show HN: DuckDB for Kafka Stream Processing

Re:Show HN: DuckDB for Kafka Stream Processing by mbay on Monday December 08, 2025 @01:32PM (#46195882)

I see an example with what looks like a lookup-type join against a Postgres DB. Are stream/stream joins supported, though?

The DLQ and Prometheus integration out of the box are nice.

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Re:Show HN: DuckDB for Kafka Stream Processing by dm03514 on Monday December 08, 2025 @01:48PM (#46196081)

Stream to stream joins are NOT currently supported. This is a regularly requested feature, and I'll look at prioritizing it.

SQLFlow uses duckdb internally for windowing and stream state storage :), and I'll look at extending it to support stream / stream joins.

Could you describe a bit more about your use case? I'd really appreciate it if you could create an issue in the repo describing your use case and desired functionality a bit!

https://github.com/turbolytics/sql-flow/issues

We were looking at solving some of the simplier use cases first before branching out into these more complicated ones :)

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Re:Show HN: DuckDB for Kafka Stream Processing by mbay on Monday December 08, 2025 @02:20PM (#46196438)

I worked on stream processing at my previous gig but don't have a need for it currently. Just curious.

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