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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5143) Remove unnecessary copying of the map in getTypeMap()
Date Mon, 21 Mar 2011 00:39:06 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13008991#comment-13008991
] 

Knut Anders Hatlen commented on DERBY-5143:
-------------------------------------------

One unintended side effect from the copying is that the returned map is mutable when using
the JDBC 4.0 driver, whereas it's immutable with the JDBC 3.0 driver.

> 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
>
> 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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