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Date: Tue, 10 Apr 2007 01:25:32 -0700 (PDT)
From: "Andrew McIntyre (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Updated: (DERBY-1623) Add ANSI TRIM implementation
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     [ https://issues.apache.org/jira/browse/DERBY-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew McIntyre updated DERBY-1623:
-----------------------------------

    Attachment: 1623-parser-guess.diff

Hi Manish,

I took a stab at implementing the TRIM grammar that Bernt described. This generates a valid grammar via javacc, but only because the call to columnReference in the new characterValueExpression is commented out. Uncommented, that generates the following error:

     [java] Warning: Choice conflict involving two expansions at
     [java]          line 6183, column 5 and line 6188, column 5 respectively.
     [java]          A common prefix is: "ucase"
     [java]          Consider using a lookahead of 2 for earlier expansion.

so some work would be needed to disambiguate characterValueFunction and columnReference.

And of course, execution is an entirely separate matter, but I thought this might give you some food for thought.

> Add ANSI TRIM implementation
> ----------------------------
>
>                 Key: DERBY-1623
>                 URL: https://issues.apache.org/jira/browse/DERBY-1623
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Emmanuel Bernard
>         Assigned To: Manish Khettry
>         Attachments: 1623-parser-guess.diff
>
>
> JPA is requiring databases to support this ANSI feature esp the ability to chose the trimmed character
> TRIM([ [ LEADING | TRAILING | BOTH ] [ chars ] FROM ] str)

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