Hi,

I wrote a simple program using Flink Table API. 
There is a Table source reading from an avro file, after doing some operations 
the result is stored using a sink csv table using `executeInsert()`

The program works fine and creates a csv file however the flink command does 
not wait for job to complete.

```
adsilva@C02XH3ZSJGH6 flink-1.14.3 % ./bin/flink run 
~/IdeaProjects/quickstart/target/app-0.1.jar --input 
part-v001-o000-r-00330.avro --output 
~/Downloads/dev-things/flink-1.14.3/output-8
Job has been submitted with JobID ff6f2e89a11e135d4978f7e4d2b1e2bc
adsilva@C02XH3ZSJGH6 flink-1.14.3 % 
```

However if I write the same program as a mixture of DataStream and Table API by 
taking input from DataStream but operating on it using Table API and writing it 
using Table sink then it does wait for job completion.


```
adsilva@C02XH3ZSJGH6 flink-1.14.3 % ./bin/flink run 
~/IdeaProjects/quickstart/target/domains_stats_processor-0.1.jar --input 
part-v001-o000-r-00330.avro --output 
~/Downloads/dev-things/flink-1.14.3/output-7
Job has been submitted with JobID a00ffab083747ec0e421c1d6ab0822ea
Job has been submitted with JobID 84ccd320f8015a53c8807380b829e529
Program execution finished
Job with JobID 84ccd320f8015a53c8807380b829e529 has finished.
Job Runtime: 31521 ms
```

It nicely prints the runtime as well (Although not sure why its starting two 
jobs here).

Why does this happen? How can I make Flink wait for job completion with pure 
Table API?

Please help, Thank you!

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