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 <[email protected]> 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* >
