Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/2265
I was also thinking a lot about the names, because we have currently many
`Function`s in Flink. I chose `UserDefinedFunction` as the top-level function
for all user-defined functions such as `ScalarFunction`, `TableFunction`,
`AggregateFunction`, or what ever will come in future.
If you have a look into the tests you will see that the Java API supports
both: postfix and infix notation. So you can also call functions
`hashCode(text)` if you like.
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