Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/1862#issuecomment-206986445
Awesome! Really cool to see that coming to Flink.
I played a bit around with it and it seems to work ;)
```java
Table table = tableEnv.fromDataSet(input);
tableEnv.registerTable("tab", table);
tableEnv.registerTable("tab1", table);
Table res = tableEnv.sql("SELECT COUNT(tab1.acount) AS acount, tab.word " +
"FROM tab, tab1 " +
"WHERE tab.word = tab1.word GROUP BY tab.word");
res = res.filter("acount > 2");
```
```java
Table res = tableEnv.sql("SELECT COUNT(acount) AS acount, word " +
"FROM (SELECT * FROM tab WHERE acount = 1 ) " +
"GROUP BY word");
```
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