Add batch label? It seems batch already support distinct. BTW, over is not yet
supported in batch.
Maybe it is better to remove these documents about distinct aggregation? Append
a distinct column in all Aggregation examples?
For `GroupBy Aggregation`, change the sql
from
```
Table orders = tableEnv.scan("Orders");
Table result = orders.groupBy("a").select("a, b.sum as d");
```
to
```
Table orders = tableEnv.scan("Orders");
Table result = orders.groupBy("a").select("a, b.sum as d, b.sum.distinct as e");
```
What's more, we probably should add UDAGG document like it in SQL document
about Aggregations and add distinct column.
[ Full content available at: https://github.com/apache/flink/pull/6521 ]
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