[
https://issues.apache.org/jira/browse/FLINK-16627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17060863#comment-17060863
]
jackray wang edited comment on FLINK-16627 at 3/17/20, 12:06 PM:
-----------------------------------------------------------------
I suggest adding a parameter when defining a sinktable like “format.remove-null
= true” ，if this parameter is true ，remove all the keys which value are
nulls，and this parameter default value set to false ,do nothing. Compatible
with previous scripts, add parameters if necessary.
was (Author: jackray):
I suggest adding a parameter when defining a sinktable like “format.removenull
= true” ，if this parameter is true ，remove all the keys which value are
nulls，and this parameter default value set to false ,do nothing. Compatible
with previous scripts, add parameters if necessary.
> when insert into kafkas ,how can i remove the keys with null values of json
> ---------------------------------------------------------------------------
>
> Key: FLINK-16627
> URL: https://issues.apache.org/jira/browse/FLINK-16627
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Client
> Affects Versions: 1.10.0
> Reporter: jackray wang
> Priority: Major
>
> {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
>
>
>
>
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
