[jira] [Created] (FLINK-13350) Distinguish between temporary tables and persisted tables

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-13350:
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             Summary: Distinguish between temporary tables and persisted tables
                 Key: FLINK-13350
                 URL: https://issues.apache.org/jira/browse/FLINK-13350
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / API
            Reporter: Timo Walther
            Assignee: Timo Walther


Currently, there is no difference between temporary tables that are only available to the current session and tables that need to be persisted in a catalog. FLINK-13279 is an example for this shortcoming. Because we introduce the first real catalog support in Flink 1.9, the difference becomes more important to users.

A user must be able to express whether a table is just temporary or get an exception if it can not be persisted as desired. Currently, non-persisted tables are silently stored in a separate volatile data structure.

This issue might touch API, DDL, and SQL Client. We should discuss how we approach this issue for the 1.9 release.

Some background information for people that would like to join the discussion:

MySQL:
https://dev.mysql.com/doc/refman/8.0/en/create-temporary-table.html
http://www.mysqltutorial.org/mysql-temporary-table/

Spark:
https://spark.apache.org/docs/latest/sql-getting-started.html#global-temporary-view

SQL Server:
https://docs.microsoft.com/en-us/sql/t-sql/statements/create-table-transact-sql?view=sql-server-2017
https://docs.microsoft.com/de-de/sql/relational-databases/databases/tempdb-database?view=sql-server-2017





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