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  • The first common use case is "table join by foreign-key". Details can be found here: 
    Jira
    serverASF JIRA
    columnskey,summary,type,created,updated,due,assignee,reporter,priority,status,resolution
    serverId5aa69414-a9e9-3523-82ec-879b028fb15b
    keyKAFKA-3705
  • The second common use case is WKTable-KTable join or WKTable-WKTable join. For example, think of "subscribing to a feed of log4j output and detect any error that is at least N standard deviations higher than the same time last week (assuming a sliding window of 1 minute every 1 second)". They are thought about in the original design (see this page for details), but decided to be discarded for the first release due to API complexity.

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