[jira] [Commented] (PHOENIX-4815) support alter table modify column

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

    [ https://issues.apache.org/jira/browse/PHOENIX-4815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849599#comment-16849599 ] 

Jepson commented on PHOENIX-4815:
---------------------------------

Support for CDH versions?

> support alter table modify column 
> ----------------------------------
>
>                 Key: PHOENIX-4815
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4815
>             Project: Phoenix
>          Issue Type: Improvement
>    Affects Versions: 4.12.0, 4.13.0, 4.14.0
>            Reporter: jaanai
>            Assignee: jaanai
>            Priority: Major
>         Attachments: PHOENIX-4815-master-v2.patch, PHOENIX-4815.patch
>
>
> if we want to change max length or scale of  fields of  variable length type(  example for :varchar, char and decimal type etc),  we can not drop column to recreate new column when the table has massive data,  which may affects online service，meanwhile, it is also very expensive. so sometimes this function is very useful.
> Taking ORACLE dialect as an reference 
> {code:java}
> alter table
>    table_name
> modify
>    column_name  datatype;
> {code}
> reference link: https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_3001.htm#i2103956



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