Registering UDAF in blink batch app

[Dmytro Dragan]

Hi All,

Could you please tell how to register custom Aggregation function in blink 
batch app?
In case of streaming mode:
We create

EnvironmentSettings bsSettings = 
EnvironmentSettings.newInstance().useBlinkPlanner().inStreamingMode().build();
StreamTableEnvironment tableEnv = StreamTableEnvironment.create(env, 
bsSettings);

Which has:
<T, ACC> void registerFunction(String name, AggregateFunction<T, ACC> 
aggregateFunction);

But in case of batchMode, we need to create TableEnvironment:


EnvironmentSettings bsSettings = 
EnvironmentSettings.newInstance().useBlinkPlanner().inBatchMode().build();
tEnv = TableEnvironment.create(bsSettings);

Which does not have this function to register AggregationFunction, only Scalar 
one.

Details: Flink 1.10, Java API