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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (DERBY-4415) Make it easy to plug custom AST printers into the compiler
Date Mon, 19 Oct 2009 19:56:59 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767494#action_12767494
] 

Rick Hillegas edited comment on DERBY-4415 at 10/19/09 7:56 PM:
----------------------------------------------------------------

Here's a sample script which pokes a custom AST printer into the compiler:

connect 'jdbc:derby:memory:dummy;create=true';

create table t( a int );

create procedure setInspector( visitorClassName varchar( 32672 ) )
language java
parameter style java
modifies sql data
external name 'ASTInspector.setInspector'
;

call setInspector( 'XmlASTPrinter' );

select * from t;

The custom printer writes the parsed, bound, and optimized trees as xml into derbyAST.xml.
You can then pull that printout into your favorite tool for browsing xml. I use Firefox for
this. Firefox lets me collapse and expands elements in this printout. Since each node in an
AST is printed as a separate element, this is very handy for revealing the structure of a
plan and for hiding the details you are not interested in.

call setInspector( null );


      was (Author: rhillegas):
    Here's a sample script which pokes a custom AST printer into the compiler:

connect 'jdbc:derby:memory:dummy;create=true';

create table t( a int );

create procedure setInspector( visitorClassName varchar( 32672 ) )
language java
parameter style java
modifies sql data
external name 'ASTInspector.setInspector'
;

call setInspector( 'XmlASTPrinter' );

select * from t;

call setInspector( null );

  
> Make it easy to plug custom AST printers into the compiler
> ----------------------------------------------------------
>
>                 Key: DERBY-4415
>                 URL: https://issues.apache.org/jira/browse/DERBY-4415
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Rick Hillegas
>            Priority: Minor
>         Attachments: ASTInspector.java, derby-4415-01-aa-customASTprinters.diff, XmlASTPrinter.java
>
>
> It would be nice to be able to tell the compiler to use user-written formatters for pretty-printing
Derby's abstract syntax trees. For instance, it would be nice to be able to plug in the AST
printers attached to DERBY-791, including the Eclipse-based tree grapher written by Kay Röpke.

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