## What is the purpose of the change

Fixes the key validation for SQL queries with group window aggregates that are 
emitted to an `UpsertStreamTableSink`.

## Brief change log

* Handle window properties (start, end, rowtime) in one equivalence group 
because all property attributes identify the same window.
* Add tests for SQL `INSERT INTO` of different result types to different types 
of table sinks.

## Verifying this change

* Run the added tests.

## Does this pull request potentially affect one of the following parts:

  - Dependencies (does it add or upgrade a dependency): **no**
  - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: **no**
  - The serializers: **no**
  - The runtime per-record code paths (performance sensitive): **no**
  - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: **no**
  - The S3 file system connector: **no**

## Documentation

  - Does this pull request introduce a new feature? **no**
  - If yes, how is the feature documented? **n/a**


[ Full content available at: https://github.com/apache/flink/pull/6641 ]
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