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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5779) Table functions and vtis should only accept arguments which are constant in their query block.
Date Thu, 21 Jun 2012 15:36:43 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas updated DERBY-5779:

    Attachment: derby-5779-01-ab-forbidReferencesInQueryBlock.diff

Attaching derby-5779-01-ab-forbidReferencesInQueryBlock.diff. This patch prevents table function
parameters from referring to other tables in the same query block. I am running regression
tests now.

There already was a place in the bind() logic for table functions where we dug up column references
inside parameter expressions. I simply inserted another check there.

Touches the following files:


M       java/engine/org/apache/derby/loc/messages.xml
M       java/shared/org/apache/derby/shared/common/reference/SQLState.java

Added a new error message for this condition. I considered re-using 42X04, which we use for
the parallel error with correlated subqueries in the FROM list. However, I think that message
is already too long, complicated, and confusing.


M       java/engine/org/apache/derby/impl/sql/compile/FromVTI.java

The actual fix.


M       java/testing/org/apache/derbyTesting/functionTests/tests/lang/TableFunctionTest.java

New tests.

> Table functions and vtis should only accept arguments which are constant in their query
> ----------------------------------------------------------------------------------------------
>                 Key: DERBY-5779
>                 URL: https://issues.apache.org/jira/browse/DERBY-5779
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:
>            Reporter: Rick Hillegas
>         Attachments: derby-5779-01-ab-forbidReferencesInQueryBlock.diff
> Derby lets you invoke a table function/vti in the FROM list of a query, passing in arguments
built out of columns in other tables in the FROM list. This syntax is illegal and the resulting
queries have no meaning under the SQL Standard. See the discussion on DERBY-5554. We should
forbid this syntax. Similar syntax involving correlated subqueries in the FROM list is already
forbidden. Fixing this will create a backward incompatibility which requires a release note.
In particular, the sample usage for SYSCS_DIAG.SPACE_TABLE, given in the Reference Manual,
will no longer work after fixing this bug. Changes to SPACE_TABLE are being discussed on DERBY-5554.

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