[jira] [Updated] (HIVE-18853) Alter table change column shouldn't let define same constraint on a column with existing constraint

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

     [ https://issues.apache.org/jira/browse/HIVE-18853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vineet Garg updated HIVE-18853:
-------------------------------
    Description: 
{code:sql}
create table ttest(i int constraint nn1 not null enable);
alter table ttest change i i int constraint nn2 not null enable);
{code}
The above statements will end up creating multiple not null constraints on column i/j.
{code:sql}
desc formatted ttest;

# Not Null Constraints
Table:              	constraints.ttest
Constraint Name:    	nn1
Column Name:        	i

Constraint Name:    	nn2
Column Name:        	i
{code}

  was:
{code:sql}
create table ttest(i int constraint nn1 not null enable);
alter table ttest change i j int constraint nn2 not null enable);
{code}

The above statements will end up creating multiple not null constraints on column i/j. 
{code:sql}
desc formatted ttest;

# Not Null Constraints
Table:              	constraints.ttest
Constraint Name:    	nn1
Column Name:        	null

Constraint Name:    	nn2
Column Name:        	j
{code}


> Alter table change column shouldn't let define same constraint on a column with existing constraint
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-18853
>                 URL: https://issues.apache.org/jira/browse/HIVE-18853
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>             Fix For: 3.0.0
>
>
> {code:sql}
> create table ttest(i int constraint nn1 not null enable);
> alter table ttest change i i int constraint nn2 not null enable);
> {code}
> The above statements will end up creating multiple not null constraints on column i/j.
> {code:sql}
> desc formatted ttest;
> # Not Null Constraints
> Table:              	constraints.ttest
> Constraint Name:    	nn1
> Column Name:        	i
> Constraint Name:    	nn2
> Column Name:        	i
> {code}



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