[jira] [Commented] (FLINK-20880) Turn Json String into Row

["Shengkai Fang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-20880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17260921#comment-17260921 ] 

Shengkai Fang commented on FLINK-20880:
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Could you give a more concreate description about this issue? I think it's better to split one sentence into multiple sentences for others to understand.

 

I don't understand what's the output of the message b and message c after transformation from json string to row.  

> Turn Json String into Row 
> --------------------------
>
>                 Key: FLINK-20880
>                 URL: https://issues.apache.org/jira/browse/FLINK-20880
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / Core
>    Affects Versions: 1.12.0
>            Reporter: tonychan
>            Priority: Major
>
> schema has  three params ,a,b,c
> message a：\{ "a": 1, "b": 1, "c": 2}   
> message b：\{ "a": 1, "b": null, "c": 2}   
> message c：\{ "a": 1,  "c": 2}   
>  
> turn message into row , message a is ok, but we cant distinguish message b and message c if we use null, when deal message c ,we must use like NaN row(2,NaN),  i think row need a easy way to show message b and message c  with row
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