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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-268) Add Support for truncate table
Date Mon, 11 Oct 2010 13:49:33 GMT

    [ https://issues.apache.org/jira/browse/DERBY-268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12919823#action_12919823
] 

Rick Hillegas commented on DERBY-268:
-------------------------------------

Hi Eranda,

You are on the right track. sqlgrammar.jj is the right place to start to see how the TableElementList
is constructed. But at parse() time you don't have enough information to construct the list
for a TRUNCATE TABLE statement. You only have that information at bind() time. That is because
it is the responsibility of the bind() phase to look at the metadata to fill in missing facts
about the table.

The nodeFactory.getNode() call cited above will give you an empty TableElementList. You then
need to put one TableElementNode on that list, a TableElementNode which represents the action
ALTER TABLE ALTER COLUMN...RESTART WITH. To see how to make that node, look in sqlgrammar.jj
for the string "<RESTART> <WITH>".

The TableElementList itself should be constructed in AlterTableNode.bindStatement() once you
know that you are dealing with a TRUNCATE TABLE statement.

Hope this helps,
-Rick

> Add Support for truncate table
> ------------------------------
>
>                 Key: DERBY-268
>                 URL: https://issues.apache.org/jira/browse/DERBY-268
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Lance Andersen
>            Assignee: Eranda Sooriyabandara
>            Priority: Minor
>         Attachments: changes.diff, derby-268-01-ab-enableForInsaneBuilds.diff, derby-268-02-aa-permsTest.diff,
derby-268-03-aa-npe.diff, Derby-268.diff, tests.diff, TruncateConcurrency.java, TruncateConcurrency.java,
TruncateConcurrency.java
>
>
> Adding support for truncate table command will aid to portability

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