Re: Uncertain result when using group by in stream sql

Hi, A GROUP BY query on a streaming table requires that the result is continuously updated. Updates are propagated as a retraction stream (see tEnv.toRetractStream(table, Row.class).print(); in your code). A retraction stream encodes the type of the update as a boolean flag, the "true" and "false

Uncertain result when using group by in stream sql

I use flink stream sql to write a demo about "group by". The records are [(bj, 1), (bj, 3), (bj, 5)]. I group by the first element and sum the second element. Every time I run the program, the result is different. It seems that the records are out of order. Even sometimes record is los