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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5116) Enable generated code debugging in each Drill operator
Date Thu, 05 Jan 2017 03:48:58 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15800203#comment-15800203
] 

ASF GitHub Bot commented on DRILL-5116:
---------------------------------------

Github user Ben-Zvi commented on a diff in the pull request:

    https://github.com/apache/drill/pull/716#discussion_r94697483
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/compile/QueryClassLoader.java
---
    @@ -58,6 +58,19 @@ public void injectByteCode(String className, byte[] classBytes) throws
IOExcepti
           throw new IOException(String.format("The class defined %s has already been loaded.",
className));
         }
         customClasses.put(className, classBytes);
    +
    --- End diff --
    
    Maybe add a comment that for the "before manipulations BC" see ClassCompilerSelector.java
(line 122) 


> Enable generated code debugging in each Drill operator
> ------------------------------------------------------
>
>                 Key: DRILL-5116
>                 URL: https://issues.apache.org/jira/browse/DRILL-5116
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.9.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Minor
>
> DRILL-5052 adds the ability to debug generated code. Some of the code generated by Drill's
operators has minor problems when compiled directly using the new technique. These issues
are ignore by the byte-code-merge technique uses in production. This ticket asks to try the
DRILL-5052 feature in each operator, clean up any minor problems, and ensure each operator
generates code suitable for debugging. Use the new {{CodeGenerator.plainOldJavaCapable()}}
method to mark each generated class as ready for "plain-old Java" code gen.
> The advantages of this feature are two:
> 1. Ability to step through the generated code to increase understanding of existing operators
and to ease development of improvements to existing operators and of any new operators we
choose to create.
> 2. Open the door to experimenting with how to improve performance of the generated code.



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