GitHub user kiszk opened a pull request:

    https://github.com/apache/spark/pull/20612

    [SPARK-23424][SQL]Add codegenStageId in comment

    ## What changes were proposed in this pull request?
    
    This PR always adds `codegenStageId` in comment of the generated class. 
This is a replication of #20419  for post-Spark 2.3.
    
    ```
    /* 001 */ public Object generate(Object[] references) {
    /* 002 */   return new GeneratedIteratorForCodegenStage1(references);
    /* 003 */ }
    /* 004 */
    /* 005 */ // codegenStageId=1
    /* 006 */ final class GeneratedIteratorForCodegenStage1 extends 
org.apache.spark.sql.execution.BufferedRowIterator {
    /* 007 */   private Object[] references;
    ...
    ```
    
    ## How was this patch tested?
    
    Existing tests

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/kiszk/spark SPARK-23424

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/20612.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #20612
    
----
commit 1bf0640264533e0830cc339c37931328e2a622eb
Author: Kazuaki Ishizaki <ishizaki@...>
Date:   2018-02-14T19:22:20Z

    initial commit

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