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https://issues.apache.org/jira/browse/FLINK-21284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17279286#comment-17279286
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Jark Wu commented on FLINK-21284:
---------------------------------
[~hehuiyuan], do you mean you get result sample < 8 in the sink?
> Non-deterministic UDF functions return different values
> -------------------------------------------------------
>
> Key: FLINK-21284
> URL: https://issues.apache.org/jira/browse/FLINK-21284
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: hehuiyuan
> Priority: Major
> Attachments: image-2021-02-05-10-23-02-616.png,
> image-2021-02-05-10-23-20-639.png
>
>
> Non-deterministic UDF functions is used mutiple times , the result is
> different.
>
> {code:java}
> tableEnv.registerFunction("sample", new SampleFunction());
> Table tm = tableEnv.sqlQuery("select name, RAND_INTEGER(10) as sample , sex
> from myhive_staff");
> tableEnv.registerTable("tmp", tm);
> tableEnv.sqlUpdate("insert into sinktable select * from tmp where sample >=
> 8");
> // UDF函数
> public class SampleFunction extends ScalarFunction {
> public int eval(int pvid) {
> int a = (int) (Math.random() * 10);
> System.out.println("************************" + a );
> return a;
> }
> }{code}
>
> Sample udf function is used for `RAND_INTEGER(10) as sample` when sink,
> which lead to inconsistent result.
>
> !image-2021-02-05-10-23-02-616.png|width=759,height=433!
>
>
> !image-2021-02-05-10-23-20-639.png|width=1664,height=728!
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