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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6003) Create row templates outside of the generated code
Date Mon, 31 Dec 2012 02:32:13 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6003?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13541227#comment-13541227
] 

Dag H. Wanvik commented on DERBY-6003:
--------------------------------------

Thanks for working on reducing the amount of generated code, Knut! This is a tricky area and
I haven't been able to follow this issue closely, but your approach seems good to me.
                
> Create row templates outside of the generated code
> --------------------------------------------------
>
>                 Key: DERBY-6003
>                 URL: https://issues.apache.org/jira/browse/DERBY-6003
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.10.0.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>             Fix For: 10.10.0.0
>
>         Attachments: d6003-1a-cleanup.diff, d6003-2a-unused-field.diff, d6003-3a-safe-downgrade.diff,
d6003-3b-downgrade-workaround-in-tests.diff, d6003-3c-downgrade-with-stored-proc.diff, d6003-4a-scanresultset.diff,
d6003-5a-sort-vti-aggregate-window.diff, d6003-6a-index-to-base-row.diff
>
>
> The constructors for many of the result set classes take GeneratedMethod parameters that
create row templates (an ExecRow of a certain size and column types, each column initialized
to an SQL null value).
> As an alternative, the compiler could produce an ExecRow instance and put it into the
savedObjects field of GenericPreparedStatement, and the constructors could take parameter
that points to the object in savedObjects. Where the result sets currently invoke the generated
method to produce a fresh template, they could instead clone the saved object.
> Advantages with the suggested approach would be:
> - Reduce the size of the code generator, which should reduce total code complexity.
> - Reduce the amount of generated code, which makes it easier for tools (profilers, static
code analyzers, IDEs) to map executable code to source code.
> - Reduce the actual number of generated methods, which makes it less likely that queries
need to use reflection to invoke the remaining generated methods (there's a switchover from
DirectCall to ReflectCall when the number of generated methods exceeds 10).

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