[jira] [Assigned] (IGNITE-5949) DDL: Support ALTER TABLE DROP COLUMN

["Sergey Kalashnikov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-5949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sergey Kalashnikov reassigned IGNITE-5949:
------------------------------------------

    Assignee: Sergey Kalashnikov  (was: Alexander Paschenko)

> DDL: Support ALTER TABLE DROP COLUMN
> ------------------------------------
>
>                 Key: IGNITE-5949
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5949
>             Project: Ignite
>          Issue Type: New Feature
>          Components: sql
>            Reporter: Andrew Mashenkov
>            Assignee: Sergey Kalashnikov
>             Fix For: 2.4
>
>
> Ignite should support {{DROP COLUMN}} operation for {{ALTER TABLE}} command.
> Design considerations:
> 1) Drop should only be possible on binary types without schema (see IGNITE-6611). Probably we will need a new option for {{CREATE TABLE}} command
> 2) Drop should not block other operations for a long time. We should synchronously block the table, change meta, then release the lock and let operations continue.
> 3) Actual data remove should be performed asynchronously in the same way we create index. During this time we should not allow any other modifications to the table
> 4) Be careful with node stop - we do not want to wait for years for this command to complete.



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