[jira] [Commented] (FLINK-23313) Reintroduce temporal table function documentation

["Timo Walther (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-23313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17377337#comment-17377337 ] 

Timo Walther commented on FLINK-23313:
--------------------------------------

CC [~Leonard Xu]

> Reintroduce temporal table function documentation
> -------------------------------------------------
>
>                 Key: FLINK-23313
>                 URL: https://issues.apache.org/jira/browse/FLINK-23313
>             Project: Flink
>          Issue Type: Bug
>          Components: Documentation, Table SQL / API
>            Reporter: Timo Walther
>            Priority: Critical
>
> FLIP-132 introduced the new {{FOR SYSTEM_TIME AS OF}} and dropped the main documentation for temporal table function. This causes a lot of confusion for users.
> First, because processing time joins are not supported yet.
> Second, because a primary key might not always be present in the current pipeline when using Table API.
> We have not deprecated `createTemporalTableFunction` and the documentation in https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/dev/table/tableapi/#join-with-temporal-table is not enough.



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