[jira] [Closed] (DERBY-6557) The identity counter is reset to its start point if you truncate a table and then perform an insert driven by a select from a table function

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

     [ https://issues.apache.org/jira/browse/DERBY-6557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rick Hillegas closed DERBY-6557.
--------------------------------


> The identity counter is reset to its start point if you truncate a table and then perform an insert driven by a select from a table function
> --------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-6557
>                 URL: https://issues.apache.org/jira/browse/DERBY-6557
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.11.0.0
>            Reporter: Rick Hillegas
>
> The following script shows this problem:
> {noformat}
> connect 'jdbc:derby:memory:db;create=true';
> create table t
> (
>     a bigint generated always as identity,
>     b int
> );
> create function integerList() returns table
> (
>     a int,
>     b int,
>     c int,
>     d int
> )
> language java parameter style derby_jdbc_result_set no sql
> external name 'org.apache.derbyTesting.functionTests.tests.lang.MergeStatementTest.integerList_023';
> insert into t( b ) values ( 1 ), ( 2 ), ( 3 ), ( 4 ), ( 5 );
> insert into t( b ) select b from table( integerList() ) il;
> select * from t;
> -- truncate followed by ordinary insert doesn't reset the identity counter
> truncate table t;
> insert into t( b ) values ( 1 ), ( 2 ), ( 3 ), ( 4 ), ( 5 );
> select * from t;
> -- but truncate followed by an insert driven by a table function does
> truncate table t;
> insert into t( b ) select b from table( integerList() ) il;
> select * from t;
> {noformat}



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