godfreyhe opened a new pull request #9433: [FLINK-13708] [table-planner-blink] 
transformations should be cleared after execution in blink planner
URL: https://github.com/apache/flink/pull/9433
   ## What is the purpose of the change
   *transformations should be cleared after execution in blink planner*
   ## Brief change log
     - *clear transformations in ExecutorBase*
   ## Verifying this change
   This change added tests and can be verified as follows:
     - *Added testExecuteTwiceUsingSameTableEnv to verify this bug*
   ## Does this pull request potentially affect one of the following parts:
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** 
/ don't know)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   ## Documentation
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (not applicable / docs / JavaDocs 
/ **not documented**)

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