## What is the purpose of the change

This PR fixes the wrong materialization for the debugging visualization in 
table mode.


## Brief change log

- Rework the caching mechanism in `MaterializedCollectStreamResult`.

## Verifying this change

- Unit test added in `MaterializedCollectStreamResultTest`.

## 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? not applicable


[ Full content available at: https://github.com/apache/flink/pull/6617 ]
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