Github user twalthr commented on a diff in the pull request:
    --- Diff: 
    @@ -28,14 +28,14 @@ import org.apache.calcite.util.BuiltInMethod
     import org.apache.flink.api.common.typeinfo.BasicTypeInfo._
     import org.apache.flink.api.common.typeinfo.{BasicTypeInfo, 
SqlTimeTypeInfo, TypeInformation}
    -import org.apache.flink.api.table.functions.utils.ScalarSqlFunction
    +import org.apache.flink.api.table.functions.utils.{TableSqlFunction, 
     import scala.collection.mutable
    -  * Global hub for user-defined and built-in advanced SQL scalar functions.
    +  * Global hub for user-defined and built-in advanced SQL functions.
    -object ScalarFunctions {
    +object SqlFunctionUtils {
    --- End diff --
    We could call this `FunctionGenerator`. IMO it is more than just a util 

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