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Date: Thu, 8 Dec 2016 15:26:59 +0000 (UTC)
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Subject: [jira] [Commented] (DRILL-5052) Option to debug generated Java code
 using an IDE
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archived-at: Thu, 08 Dec 2016 15:27:04 -0000


    [ https://issues.apache.org/jira/browse/DRILL-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15732484#comment-15732484 ] 

ASF GitHub Bot commented on DRILL-5052:
---------------------------------------

Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/660#discussion_r91279238
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/expr/ClassGenerator.java ---
    @@ -411,6 +417,10 @@ public boolean equals(Object obj) {
     
       }
     
    +  /**
    +   * Represents a (Nullable)?(Type)Holder instance.
    +   */
    +
       public static class HoldingContainer{
         private final JVar holder;
    --- End diff --
    
    Space before curly brace.


> Option to debug generated Java code using an IDE
> ------------------------------------------------
>
>                 Key: DRILL-5052
>                 URL: https://issues.apache.org/jira/browse/DRILL-5052
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Codegen
>    Affects Versions: 1.8.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Minor
>
> Drill makes extensive use of Java code generation to implement its operators. Drill uses sophisticated techniques to blend generated code with pre-compiled template code. An unfortunate side-effect of this behavior is that it is very difficult to visualize and debug the generated code.
> As it turns out, Drill's code-merge facility is, in essence, a do-it-yourself version of subclassing. The Drill "template" is the parent class, the generated code is the subclass. But, rather than using plain-old subclassing, Drill combines the code from the two classes into a single "artificial" packet of byte codes for which no source exists.
> Modify the code generation path to optionally allow "plain-old Java" compilation: the generated code is a subclass of the template. Compile the generated code as a plain-old Java class with no byte-code fix-up. Write the code to a known location that the IDE can search when looking for source files.
> With this change, developers can turn on the above feature, set a breakpoint in a template, then step directly into the generated Java code called from the template.
> This feature should be an option, enabled by developers when needed. The existing byte-code technique should be used for production code generation.


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