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https://issues.apache.org/jira/browse/AMQ-8613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17542821#comment-17542821
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Enrico Olivelli commented on AMQ-8613:
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This is my patch https://github.com/apache/activemq/pull/842
> Improve performance of selectors with a big sequence of OR and AND logical
> expressions
> --------------------------------------------------------------------------------------
>
> Key: AMQ-8613
> URL: https://issues.apache.org/jira/browse/AMQ-8613
> Project: ActiveMQ
> Issue Type: Improvement
> Components: JMS client
> Affects Versions: 5.17.1
> Reporter: Enrico Olivelli
> Priority: Major
>
> Currently when you create a selector with OR and ANDs the filter creates a
> huge stack trace.
> This is because for each element in the OR and AND expression node we have to
> execute a method call.
> This is happening because OR and AND expressions are treated as
> BinaryExpressions.
> A very simple but effecting improvement is to not represent OR and AND
> expressions as binary expression but store the list of siblings expression in
> only one node.
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