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

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

     [ https://issues.apache.org/jira/browse/PHOENIX-4815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jaanai Zhang updated PHOENIX-4815:
----------------------------------
    Description: 
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}


  was:
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 reference 

{code:java}
alter table
   table_name
modify
   column_name  datatype;
{code}



> support alter table modify column 
> ----------------------------------
>
>                 Key: PHOENIX-4815
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4815
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Jaanai Zhang
>            Priority: Major
>
> 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}



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