Github user kunalkhamar commented on the issue:

    https://github.com/apache/spark/pull/16826
  
    @rxin 
    The change from `SessionState(SparkSession,parentSessionState)` to 
`SessionState(SparkSession,SQLConf,SessionCatalog,...)` is mostly done. Still 
have 4 failing tests (OOMs) and will create some more tests.
    
    Also, currently `SparkSession` has-a `SessionState` and `SessionState` 
has-a `SparkSession`. Investigating into removing the `SparkSession` reference 
from inside `SessionState`. This would change the constructor from 
`SessionState(SparkSession,SQLConf,SessionCatalog,...)`to 
`SessionState(SQLConf,SessionCatalog,...)`.
    
    There are fields inside `SessionState` that depend on `SparkSession`, e.g. 
`Analyzer` and `QueryExecution`. But these can be created and passed in to 
`SessionState` during creation. It seems we might be able to pull up all such 
references to `SparkSession` to initialization (i.e. inside 
`SessionState.apply`.) Same goes for `HiveSessionState`.
    
    Any thoughts on this?


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