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https://issues.apache.org/jira/browse/DERBY-6361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13786283#comment-13786283
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Knut Anders Hatlen commented on DERBY-6361:
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I'm wondering if one possible fix could be to change the aforementioned
getSchemaDescriptor() call in
DMLModStatementNode.parseAndBindGenerationClauses() so that its second argument
is false. Then it will return null instead of failing. If it returns null, we
don't push the compilation schema.
I think it should work because the generated update statement does not have any
dependencies on the original compilation schema if it doesn't exist. Either the
original schema didn't exist at CREATE TABLE/ALTER TABLE time, and then the
CREATE TABLE/ALTER TABLE statement couldn't possibly have referenced anything
in that schema. Or the original schema was dropped after the original CREATE
TABLE/ALTER TABLE, and the dependency manager wouldn't allow the schema to be
dropped if the generated column depended on the schema.
> Valid statements rejected if Derby has not implicitly created the current
> user's schema.
> ----------------------------------------------------------------------------------------
>
> Key: DERBY-6361
> URL: https://issues.apache.org/jira/browse/DERBY-6361
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Attachments: derby-6361-01-aa-createDefaultSchema.diff
>
>
> There are many examples of statements failing because Derby has not
> implicitly created the schema associated with the current user. You don't see
> this if the schema is the default APP schema. But if the user is anyone other
> than APP, then various statements can fail. Maybe we should implicitly create
> a schema even if the user isn't APP. Right now, you get an error like this:
> ERROR 42Y07: Schema 'ROOT' does not exist
> The following script shows an example of this problem:
> connect 'jdbc:derby:memory:db;create=true;user=esq';
> create table licreq( domain varchar( 10 ) );
> connect 'jdbc:derby:memory:db;user=root';
> -- fails
> ALTER TABLE esq.licreq ADD COLUMN u_domain GENERATED ALWAYS AS
> (UPPER(domain));
> connect 'jdbc:derby:memory:db;user=app';
> -- succeeds
> ALTER TABLE esq.licreq ADD COLUMN u_domain GENERATED ALWAYS AS
> (UPPER(domain));
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