[jira] Commented: (DERBY-4087) Clean up debug printing of the abstract syntax trees after parsing, binding and optimization

["Dag H. Wanvik (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-4087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680222#action_12680222 ] 

Dag H. Wanvik commented on DERBY-4087:
--------------------------------------

I could imagine printing already seen subtrees something like this:

                  resultColumns:                      
                     org.apache.derby.impl.sql.compile.ResultColumnList@1e1be92
                        
                        org.apache.derby.impl.sql.compile.ResultColumn@1038de7
                        ***truncated***
                        
                        org.apache.derby.impl.sql.compile.ResultColumn@1490eb5
                        ***truncated***

Is this helpful? Searching backward in the printout would then reveal these subtrees fully printed.
Do we want a new knob to enable this, or could it be done always?




> Clean up debug printing of the abstract syntax trees after parsing, binding and optimization 
> ---------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4087
>                 URL: https://issues.apache.org/jira/browse/DERBY-4087
>             Project: Derby
>          Issue Type: Improvement
>          Components: Miscellaneous, SQL
>            Reporter: Dag H. Wanvik
>            Priority: Trivial
>
> Currently, the printing is often inconsistent:
> - some subtrees not printed
> - wrong indentation due to missing newlines, or lacking level increments
> - redundant printing of subtrees (AST is really a DAG, would be nice to print only once and then refer back to show aliasing)
> - some items printed twice due to inconsistent usage of pattern

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