candlerb opened a new issue #5520: Missing documentation for window functions URL: https://github.com/apache/pulsar/issues/5520 **Describe the bug** There is no documentation for window functions, and no python examples for window functions. **To Reproduce** Search for "window" in the docs (site2). It's mentioned in passing: > A Java function listens for the sanitized-sentences topic, counts the number of times each word appears **within a specified time window**, and publishes the results to a results topic (my emphasis) In some CLI flags: ``` ./docs/functions-cli.md:sliding-interval-count | The number of messages after which the window slides. | | ./docs/functions-cli.md:sliding-interval-duration-ms | The time duration after which the window slides. | | ./docs/functions-cli.md:window-length-count | The number of messages per window. | | ./docs/functions-cli.md:window-length-duration-ms | The time duration of the window in milliseconds. | | ``` And in a reference to release notes: > * Add Windowfunction interface to functions api [#3324](https://github.com/apache/pulsar/pull/3324) **Expected behavior** N/A **Screenshots** N/A **Desktop (please complete the following information):** N/A **Additional context** This functionality is really interesting to me, and I'd like to know (a) what it can do, and (b) if I can use it from python. I'm particularly interested if it's possible to do e.g. a ten-minute rolling window, where I can add 1 to an internal counter for an event which enters the window, and remove 1 from a count when that event leaves the window, thus maintaining a running count. It could be done without external support, but would require in-RAM buffering for all events over than 10 minute window - but buffering is what pulsar is for :-) Externally I could maintain two readers: one at the current location and one at T-10 mins. But that wouldn't work as a pulsar function AFAICS.
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