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https://issues.apache.org/jira/browse/DERBY-6003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-6003:
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Issue & fix info: (was: Patch Available)
I went ahead and committed the 3c patch with revision 1418296 and the 4a patch
with revision 1418297.
> 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
> 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
>
>
> 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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