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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-791) Expose api for printing Abstract Syntax Trees in production (non-debug) servers
Date Wed, 04 Feb 2009 15:20:00 GMT

    [ https://issues.apache.org/jira/browse/DERBY-791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12670345#action_12670345
] 

Knut Anders Hatlen commented on DERBY-791:
------------------------------------------

This looks very useful, and it's even relatively easy to read. Perhaps it would be even easier
to process the output (at least for a machine) if we split the name:value string into two
separate tags. That is, instead of

<member>replacesAggregate: false</member>

something like

<member><name>replacesAggregate</name><value>false</value></member>

or perhaps even better

<member name="replacesAggregate">false</member>

> Expose api for printing Abstract Syntax Trees in production (non-debug) servers
> -------------------------------------------------------------------------------
>
>                 Key: DERBY-791
>                 URL: https://issues.apache.org/jira/browse/DERBY-791
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Rick Hillegas
>         Attachments: derby-791-01-aa-fromListAndResultColumnList.diff, XmlTreeWalker.java
>
>
> Currently you can print Abstract Syntax Trees to derby.log by setting the DumpParseTree
tracepoint at server startup. E.g.:
> java -cp $CLASSPATH -Dderby.debug.true=DumpParseTree -Dderby.stream.error.logSeverityLevel=0
org.apache.derby.tools.ij  z.sql
> This can be a useful debugging tool. However, it only works on debug servers built with
the following flags:
> sanity=true
> debug=true
> We should provide some mechanism for printing these trees in production (non-debug) servers.

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