dawidwys opened a new pull request #8475: [FLINK-12512][table-planner] Create a 
new instance of CostFactory, FlinkTypeSystem & FlinkTypeFactory per 
TableEnvironment
URL: https://github.com/apache/flink/pull/8475
 
 
   ## What is the purpose of the change
   
   `CostFactory`, `FlinkTypeSystem` and `FlinkTypeFactory` maintain internal 
state, so we cannot reuse them for multiple TableEnvironments.
   
   ## Brief change log
   
   - Make `CostFactory`, `FlinkTypeSystem` and `FlinkTypeFactory` non static in 
`PlanningConfigurationBuilder`
   
   
   ## Verifying this change
   
   This should fix the random failures of 
`org.apache.flink.table.api.stream.table.TableSourceTest#testNestedProject`
   
   ## 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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