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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3494) Move the setup of NormalizeResultSetNode into the NormalizeResultSetNode
Date Tue, 11 Mar 2008 21:22:46 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12577607#action_12577607
] 

Bryan Pendleton commented on DERBY-3494:
----------------------------------------

Very clear writeup, Army, thank you very much!

> Move the setup of NormalizeResultSetNode into the NormalizeResultSetNode
> ------------------------------------------------------------------------
>
>                 Key: DERBY-3494
>                 URL: https://issues.apache.org/jira/browse/DERBY-3494
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.4.0.0
>            Reporter: Kathey Marsden
>            Priority: Minor
>         Attachments: d3494_npe_writeup.html, d3494_npe_writeup.html, decompile.out, npe.sql
>
>
> In DERBY-3310 Dan suggested ...
> Setting up a NormalizeResultSetNode is spread over three locations, the class itself
(very little, it's almost acting like a C struct),
> the genNormalizeResultSetNode method and then copyLengthsAndTypesToSource. A good O-O
implementation would have
> the logic to create a NormalizeResultSetNode self-contained in NormalizeResultSetNode.
> Since the ResultColumnList of the original ResultSetNode correctly describes the desired
outcome, it's not clear to
> me why NormalizeResultSetNode can't just refer to the same list and use it for its processing.
They may be some chance
> that this would cause recursion at some point, where a NormalizeResultSetNode would think
it needed to be wrapped
> in a NormalizeResultSetNode since the types of its columns and expression don't match
(i.e. when it is handled as a regular ResultSetNode).
> I think moving the setup of a NormalizeResultSetNode into the class itself, so that its
inputs are just the ResultSetNode to wrap
> would help clear up the code, especially if comments were added indicating why certain
actions were being taken.
> I am separating this task out into a separate issue, so that it can be worked on independently
of DERBY-3310.

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