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