[jira] [Updated] (FLINK-17337) Send UPDATE messages instead of INSERT and DELETE in streaming join operator

["Xintong Song (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-17337?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xintong Song updated FLINK-17337:
---------------------------------
    Fix Version/s: 1.18.0
                       (was: 1.17.0)

> Send UPDATE messages instead of INSERT and DELETE in streaming join operator
> ----------------------------------------------------------------------------
>
>                 Key: FLINK-17337
>                 URL: https://issues.apache.org/jira/browse/FLINK-17337
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Runtime
>            Reporter: Jark Wu
>            Priority: Minor
>              Labels: auto-deprioritized-major
>             Fix For: 1.18.0
>
>
> Currently, streaming join operator always send INSERT and DELETE messages for simplification if it's not inner join. However, we can send UPDATE_BEFORE and UPDATE_AFTER messages instead of INSERT and DELETE. For example, when we recieve right record "b", then we can send {{UB[a, null]}} and {{UA[a,b]}} instead of {{D[a,null]}}, {{I[a,b]}}. This is an optimization, because UB can be omitted in some cases to reduce IO cost and computation. 



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