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https://issues.apache.org/jira/browse/DERBY-5143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009286#comment-13009286
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Lily Wei commented on DERBY-5143:
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Thank you so much, Knut. I run derby-5143-1a.diff patch for ConnectionTest test
against JDBC 3.0 and JDBC 4.1. +1 for the patch.
> Remove unnecessary copying of the map in getTypeMap()
> -----------------------------------------------------
>
> Key: DERBY-5143
> URL: https://issues.apache.org/jira/browse/DERBY-5143
> Project: Derby
> Issue Type: Improvement
> Components: JDBC
> Affects Versions: 10.8.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Priority: Minor
> Attachments: derby-5143-1a.diff, getTypeMap-warning.diff
>
>
> The JDBC 4.0 Connection classes implement getTypeMap() by calling
> super.getTypeMap() and copying the resulting map. This is done to prevent an
> unchecked compiler warning that we would see if we simply returned
> super.getTypeMap() in this method. It would be cheaper and simpler to return
> super.getTypeMap() and ignore the warning.
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