[jira] [Commented] (FLINK-16627) Support only generate non-null values when serializing into JSON

["Benchao Li (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-16627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17822358#comment-17822358 ] 

Benchao Li commented on FLINK-16627:
------------------------------------

[~nilerzhou] Thank you for the interest of contributing to Flink, I assigned this to you~

> Support only generate non-null values when serializing into JSON
> ----------------------------------------------------------------
>
>                 Key: FLINK-16627
>                 URL: https://issues.apache.org/jira/browse/FLINK-16627
>             Project: Flink
>          Issue Type: New Feature
>          Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile), Table SQL / Planner
>    Affects Versions: 1.10.0
>            Reporter: jackray wang
>            Assignee: yisha zhou
>            Priority: Not a Priority
>              Labels: auto-deprioritized-major, auto-deprioritized-minor, auto-unassigned, pull-request-available, sprint
>
> {code:java}
> //sql
> CREATE TABLE sink_kafka ( subtype STRING , svt STRING ) WITH (……）
> {code}
>  
> {code:java}
> //sql
> CREATE TABLE source_kafka ( subtype STRING , svt STRING ) WITH (……）
> {code}
>  
> {code:java}
> //scala udf
> class ScalaUpper extends ScalarFunction {    
> def eval(str: String) : String= { 
>        if(str == null){
>            return ""
>        }else{
>            return str
>        }
>     }
>     
> }
> btenv.registerFunction("scala_upper", new ScalaUpper())
> {code}
>  
> {code:java}
> //sql
> insert into sink_kafka select subtype, scala_upper(svt)  from source_kafka
> {code}
>  
>  
> ----
> Sometimes the svt's value is null, inert into kafkas json like  \{"subtype":"qin","svt":null}
> If the amount of data is small, it is acceptable，but we process 10TB of data every day, and there may be many nulls in the json, which affects the efficiency. If you can add a parameter to remove the null key when defining a sinktable, the performance will be greatly improved
>  
>  
>  
>  



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