Hi Fabian,
Could you give an example that the query has a unique key?
What is the mechanism flink infer which field is the unique key(s)?
Thanks a lot!
Best, Henry
> 在 2018年8月11日，上午5:21，Fabian Hueske <fhue...@gmail.com> 写道：
>
> Hi Henry,
>
> The problem is that the table that results from the query does not have a
> unique key.
> You can only use an upsert sink if the table has a (composite) unique key.
> Since this is not the case, you cannot use upsert sink.
> However, you can implement a StreamRetractionTableSink which allows to write
> any kind of Table (append-only/update, keyed/non-keyed) to an external system.
>
> Best, Fabian
>
> 2018-08-10 17:06 GMT+02:00 徐涛 <happydexu...@gmail.com
> <mailto:happydexu...@gmail.com>>:
> Hi All,
> I am using flink 1.6 to generate some realtime programs. I want to
> write the output to table sink, the code is as below. At first I use append
> table sink, which error message tells me that I should use upsert table sink,
> so I write one. But still another error “Caused by:
> org.apache.flink.table.api.TableException: UpsertStreamTableSink requires
> that Table has a full primary keys if it is updated.” comes out,which blocks
> me. My questions is how to modify a table keys in this scenario? I also check
> the exception stack, and found that the system infer the keys field by
> val tableKeys: Option[Array[String]] =
> UpdatingPlanChecker.getUniqueKeyFields(optimizedPlan), I wonder how to make
> the function return value ?
> Thanks a lot !!!
> var praise = tableEnv.sqlQuery(s"SELECT article_id,hll(uid) as PU FROM
> praise GROUP BY HOP(updated_time, INTERVAL '1' MINUTE,INTERVAL '3'
> DAY),article_id" )
> tableEnv.registerTable("praiseAggr", praise)
>
> var comment = tableEnv.sqlQuery(s"SELECT article_id,hll(from_uid) as CU
> FROM comment GROUP BY HOP(updated_time, INTERVAL '1' MINUTE,INTERVAL '3'
> DAY),article_id" )
> tableEnv.registerTable("commentAggr", comment)
>
> var reader = tableEnv.sqlQuery(s"SELECT article_id,hll(uid) as RU FROM
> reader GROUP BY HOP(updated_time, INTERVAL '1' MINUTE,INTERVAL '3'
> DAY),article_id" )
> tableEnv.registerTable("readerAggr", reader)
>
> var finalTable = tableEnv.sqlUpdate(s"insert into "+ sinkTableName + " "
> + " SELECT p.article_id,p.PU,c.CU,r.RU from praiseAggr p FULL OUTER JOIN
> commentAggr c on p.article_id=c.article_id FULL OUTER JOIN readerAggr r on
> c.article_id=r.article_id")
>
>
>
>
>
> Thank,
> Henry Xu
>
