I'd like to start a discussion of FLIP-498: AsyncTableFunction for async table function support [1]
This feature proposes exposing AsyncTableFunction as a proper user defined function. The type already exists for Lookup Joins, but isn't usable as other UDFs. This FLIP would bring it up to parity with others. The motivation is similar to other async cases, namely improving performance while issuing long-latency calls to external systems. This is similar to AsyncScalarFunction, which exists in Flink. I realize this was effectively proposed in the past in FLIP 313. [2] This re-proposes that general feature and gives an update with additional details informed by work on AsyncScalarFunction. Looking forward to your feedback and suggestions. [1] https://cwiki.apache.org/confluence/display/FLINK/FLIP-498%3A+AsyncTableFunction+for+async+table+function+support [2] https://cwiki.apache.org/confluence/display/FLINK/FLIP-313%3A+Add+support+of+User+Defined+AsyncTableFunction Thanks, Alan
