[jira] Commented: (DERBY-25) INSERT INTO SELECT DISTINCT ... skips some values for autoincrement column

["Christian d'Heureuse (JIRA)" <de...@db.apache.org>]

     [ http://issues.apache.org/jira/browse/DERBY-25?page=comments#action_54693 ]
     
Christian d'Heureuse commented on DERBY-25:
-------------------------------------------

This is the same bug as DERBY-3 (http://issues.apache.org/jira/browse/DERBY-3)

> INSERT INTO SELECT DISTINCT ... skips some values for autoincrement column
> --------------------------------------------------------------------------
>
>          Key: DERBY-25
>          URL: http://issues.apache.org/jira/browse/DERBY-25
>      Project: Derby
>         Type: Bug
>   Components: SQL
>     Versions: 10.0.2.0
>     Reporter: Tulika Agrawal
>     Priority: Minor

>
> Reporting for Mamta Satoor.
> If we use insert into desttable, select 
> distinct from source, into a desttable which has autoincrement 
> column in it, we might see gaps in the autoincrement column if 
> there are duplicated rows in the source table. The reason for 
> this is Derby projects values into destination table columns before 
> building a distinct resultset from the source table. The piece 
> of code doing this is in org.apache.derby.impl.sql.execute.ProjectRestrictResultSet class's getNextRowCore() method where it calls doProjection. 

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