Hi Jingsong, Leonard, Thanks for your response, I'll created an issue ( https://issues.apache.org/jira/browse/FLINK-15266) to track this. And further discussions can be moved to JIRA.
Jingsong Li <jingsongl...@gmail.com> 于2019年12月16日周一 上午10:17写道： > Hi Benchao, > > Thanks for your reporting. > As Leonard said, you can create an issue in JIRA. We can go on discussing > in JIRA. > The answer is #1, Blink's behavior ensures that the job runs as much as > possible without interrupting it, so null is returned here to make it > possible to continue running. > > In JIRA, you can describe more detailed, like input data, program detail. > And you can verify master or 1.10 code too. > > Best, > Jingsong Lee > > On Mon, Dec 16, 2019 at 9:23 AM Leonard Xu <xbjt...@gmail.com> wrote: > >> Hi, Benchao, thank you for your report. >> It looks egacy planner and blink planner have different behavior. >> Could you create an issue in https://issues.apache.org/jira/browse/FLINK >> ? >> >> >> >> On Dec 15, 2019, at 16:17, Benchao Li <libenc...@gmail.com> wrote: >> >> hi all, >> >> We are using 1.9.0 blink planner, and find flink will throw NPE when we >> use >> the following SQL: >> >> ``` >> create table source { >> age int, >> id varchar >> }; >> select *case when age < 20 then cast(id as bigint) else 0 end* from >> source; >> ``` >> >> After debugging the Janino generated code, I find that NPE's reason is >> that >> `BinaryStringUtil.toLong` returns `null`, and we assign this result to a >> `long` field. >> >> Then a tried old planner, it throw a `java.lang.NumberFormatException` >> when >> casting a blank string to int. >> And also tried other illegal casting in blink, which come out to be >> `null`. >> >> So, here is my question: >> Obviously, this is a bug in blink planner, and we should fix that. But we >> have two ways to fix this: >> 1, make behavior of cast behave like before, which produces `null`, >> 2, change the behavior of blink planner to align with old planner, which >> produces `NumberFormatException`. >> >> >> >> Benchao Li >> School of Electronics Engineering and Computer Science, Peking University >> Tel:+86-15650713730 >> Email: libenc...@gmail.com <libenc...@gmail.com>; libenc...@pku.edu.cn >> >> >> > > -- > Best, Jingsong Lee > -- Benchao Li School of Electronics Engineering and Computer Science, Peking University Tel:+86-15650713730 Email: libenc...@gmail.com; libenc...@pku.edu.cn
