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Posted to issues@flink.apache.org by "Robert Metzger (Jira)" <ji...@apache.org> on 2022/06/23 14:57:00 UTC

[jira] [Created] (FLINK-28232) Allow for custom pre-flight checks for SQL UDFs

Robert Metzger created FLINK-28232:
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             Summary: Allow for custom pre-flight checks for SQL UDFs
                 Key: FLINK-28232
                 URL: https://issues.apache.org/jira/browse/FLINK-28232
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / API
            Reporter: Robert Metzger


Currently, implementors of SQL UDFs [1] can not validate the UDF input before submitting a SQL query to the runtime. 
Take for example a UDF that computes a regex based on user input. Ideally there's a callback for the UDF implementor to check if the user-provided regex is valid and compiles, to avoid errors during the execution of the SQL query.

It would be ideal to get access to the schema information resolved by the SQL planner in that pre-flight validation to also allow for schema related checks pre-flight.


[1] https://nightlies.apache.org/flink/flink-docs-master/docs/dev/table/functions/udfs/



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