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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4608) Unnecessary conversion of binary values to strings in SQLBinary.compare()
Date Tue, 06 Apr 2010 09:57:33 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Knut Anders Hatlen updated DERBY-4608:

    Attachment: isnull.diff

The attached patch makes SQLBinary.compare() use isNull() instead of getString(). It also
changes the HeapScan performance test so that it can run tests with binary strings instead
of character strings, and adds a test case that uses predicates. When running the test case
with predicates on binary data, the fix in SQLBinary reduces the time per iteration from 30
seconds to 5-6 seconds on my laptop.

Running the full regression test suite now.

> Unnecessary conversion of binary values to strings in SQLBinary.compare()
> -------------------------------------------------------------------------
>                 Key: DERBY-4608
>                 URL: https://issues.apache.org/jira/browse/DERBY-4608
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>         Attachments: isnull.diff
> SQLBinary.compare(int,DataValueDescriptor,boolean,boolean) converts the values to strings
in order to check whether any of them are null. The isNull() method should be used instead
to prevent the unnecessary conversion to strings.
> See this thread on derby-user: http://mail-archives.apache.org/mod_mbox/db-derby-user/201003.mbox/%3C001801cad09b$09aef650$1d0ce2f0$@ru%3E

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