dylanhz commented on PR #26767:
URL: https://github.com/apache/flink/pull/26767#issuecomment-3048962901
> >Should we remove nullableIfArgs in BuiltInFunctionDefinitions#ENCODE?
Same for DECODE.
>
> why ?
> ```sql
> SELECT encode(cast(null as string), 'utf-8'), encode(cast(null as string),
cast(null as string)), encode('asd', cast(null as string));
> ```
> returns
> ```
> null, null, null
> ```
> or did I miss anything?
I mean the nullability of return types are different in
`BuiltInFunctionDefinitions` and `FlinkSqlOperatorTable` ?
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