[ 
https://issues.apache.org/jira/browse/SPARK-27193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

wuyi updated SPARK-27193:
-------------------------
    Description: 
when enable `spark.sql.codegen.comments`,  there will be multiple comment 
lines. However, CodeFormatter can not handle multi comment lines currently:

 
Generated code:
/* 001 */ public Object generate(Object[] references) {
/* 002 */   return new GeneratedIteratorForCodegenStage1(references);
/* 003 */ }
/* 004 */
/* 005 */ /**
\* Codegend pipeline for stage (id=1)
\* *(1) Project [(id#0L + 1) AS (id + 1)#3L]
\* +- *(1) Filter (id#0L = 1)
\*    +- *(1) Range (0, 10, step=1, splits=4)
\*/
/* 006 */ // codegenStageId=1
/* 007 */ final class GeneratedIteratorForCodegenStage1 extends 
org.apache.spark.sql.execution.BufferedRowIterator {

  was:
when enable `spark.sql.codegen.comments`,  there will be multiple comment 
lines. However, CodeFormatter can not handle multi comment lines currently:

 
Generated code:
/* 001 */ public Object generate(Object[] references) {
/* 002 */   return new GeneratedIteratorForCodegenStage1(references);
/* 003 */ }
/* 004 */
/* 005 */ /**
* Codegend pipeline for stage (id=1)
* *(1) Project [(id#0L + 1) AS (id + 1)#3L]
* +- *(1) Filter (id#0L = 1)
*    +- *(1) Range (0, 10, step=1, splits=4)
*/
/* 006 */ // codegenStageId=1
/* 007 */ final class GeneratedIteratorForCodegenStage1 extends 
org.apache.spark.sql.execution.BufferedRowIterator {


> CodeFormatter should format multi comment lines correctly
> ---------------------------------------------------------
>
>                 Key: SPARK-27193
>                 URL: https://issues.apache.org/jira/browse/SPARK-27193
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: wuyi
>            Priority: Major
>
> when enable `spark.sql.codegen.comments`,  there will be multiple comment 
> lines. However, CodeFormatter can not handle multi comment lines currently:
>  
> Generated code:
> /* 001 */ public Object generate(Object[] references) {
> /* 002 */   return new GeneratedIteratorForCodegenStage1(references);
> /* 003 */ }
> /* 004 */
> /* 005 */ /**
> \* Codegend pipeline for stage (id=1)
> \* *(1) Project [(id#0L + 1) AS (id + 1)#3L]
> \* +- *(1) Filter (id#0L = 1)
> \*    +- *(1) Range (0, 10, step=1, splits=4)
> \*/
> /* 006 */ // codegenStageId=1
> /* 007 */ final class GeneratedIteratorForCodegenStage1 extends 
> org.apache.spark.sql.execution.BufferedRowIterator {



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