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* >>> >>
