[jira] [Commented] (FLINK-11569) Row type does not serialize in to readable format when invoke "toString" method

["Rong Rong (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-11569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16774734#comment-16774734 ] 

Rong Rong commented on FLINK-11569:
-----------------------------------

[~twalthr] [~fhueske] any thought on this JIRA? my feeling is that this is a problem but not so much critical as it doesn't break the system itself. 

However in order to fix this there's going to be a huge amount of changes on many test files. So would like to get your opinions first before I dive into the actual changes.

> Row type does not serialize in to readable format when invoke "toString" method
> -------------------------------------------------------------------------------
>
>                 Key: FLINK-11569
>                 URL: https://issues.apache.org/jira/browse/FLINK-11569
>             Project: Flink
>          Issue Type: Bug
>          Components: Type Serialization System
>            Reporter: Rong Rong
>            Assignee: Rong Rong
>            Priority: Major
>
> Seems like the "toString" method for Row type is only concatenating all fields using COMMA ",". However it does not wrap the entire Row in some type of encapsulation, for example "()". This results in nested Row being serialized as if they are all in one level.
> For example: 
> {code:java}
> Row.of("a", 1, Row.of("b", 2))
> {code}
> is printed out as 
> {code:java}
> "a",1,"b",2
> {code}
> Problematic piece of code can be found here: https://github.com/apache/flink/blob/master/flink-core/src/main/java/org/apache/flink/types/Row.java#L87



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