[jira] [Created] (FLINK-15407) Add document to explain how to write a table with PK

[Shang Yuanchun (Jira)]

Jingsong Lee created FLINK-15407:
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             Summary: Add document to explain how to write a table with PK
                 Key: FLINK-15407
                 URL: https://issues.apache.org/jira/browse/FLINK-15407
             Project: Flink
          Issue Type: Bug
          Components: Documentation, Table SQL / API
            Reporter: Jingsong Lee
             Fix For: 1.10.0


I have had several user problems:

Why is an error reported when writing the upsertsink: TableException: UpsertStreamTableSink requires that Table has a full primary keys if it is updated.

Users are confused.

I think we can consider writing a document to describe it.

User need careful like:

 
{code:java}
insert into result_table select pk1, if(pk2 is null, '', pk2) as pk2, count(*), sum(f3) from source group by pk1, pk2; {code}
This will failed.

 
{code:java}
insert into result_table select pk1, pk2, count(*), sum(f1) from (select pk1, if(pk2 is null, '', pk2) as pk2, f1 from source) group by pk1, pk2;
{code}
This can work.



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