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Posted to issues-all@impala.apache.org by "Fredy Wijaya (JIRA)" <ji...@apache.org> on 2019/01/08 19:25:00 UTC

[jira] [Assigned] (IMPALA-7832) Support IF NOT EXISTS in alter table add columns

     [ https://issues.apache.org/jira/browse/IMPALA-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Fredy Wijaya reassigned IMPALA-7832:
------------------------------------

    Assignee: Fredy Wijaya

> Support IF NOT EXISTS in alter table add columns
> ------------------------------------------------
>
>                 Key: IMPALA-7832
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7832
>             Project: IMPALA
>          Issue Type: New Feature
>          Components: Frontend
>    Affects Versions: Impala 3.1.0
>            Reporter: Thomas Tauber-Marshall
>            Assignee: Fredy Wijaya
>            Priority: Minor
>              Labels: ramp-up
>
> alter table <table_name> add [if not exists] columns (<name> <type> [, <name> <type>...])
> would add the column only if a column of the same name does not already exist
> Probably worth checking out what other databases do in different situations, eg. if the column already exists but with a different type, if "replace" is used instead of "add", etc.



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