Hi Jing, I recall there is already an open ticket for built-in aggregate functions
On Sat, Sep 18, 2021, 15:08 JING ZHANG <beyond1...@gmail.com> wrote: > Hi Yuval, > You could open a JIRA to track this if you think some functions should be > added as built-in functions in Flink. > > Best, > JING ZHANG > > Yuval Itzchakov <yuva...@gmail.com> 于2021年9月18日周六 下午3:33写道： > >> The problem with defining a UDF is that you have to create one overload >> per key type in the MULTISET. It would be very convenient to have functions >> like Snowflakes ARRAY_AGG. >> >> On Sat, Sep 18, 2021, 05:43 JING ZHANG <beyond1...@gmail.com> wrote: >> >>> Hi Kai, >>> AFAIK, there is no built-in function to extract the keys in MULTISET >>> <https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/dev/table/types/> >>> to >>> be an ARRAY. Define a UTF is a good solution. >>> >>> Best, >>> JING ZHANG >>> >>> Kai Fu <zzfu...@gmail.com> 于2021年9月18日周六 上午7:35写道： >>> >>>> Hi team, >>>> >>>> We want to know if there is any built-in function to extract the keys >>>> in MULTISET >>>> <https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/dev/table/types/> >>>> to be an ARRAY. There is no such function as far as we can find, except to >>>> define a simple wrapper UDF for that, please advise. >>>> >>>> -- >>>> *Best wishes,* >>>> *- Kai* >>>> >>>
