RussellSpitzer commented on pull request #31541:
URL: https://github.com/apache/spark/pull/31541#issuecomment-776954285


   I mean I feel like we have been allowing folks to override spark_catalog for 
a while, and it has been documented in several places like here
   
   
https://github.com/apache/spark/blob/9b875ceada60732899053fbd90728b4944d1c03d/sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala#L2702-L2712
   
   Which makes it sound to me like we are allowed to replace this, and the only 
requirement is that you would return the same tables that the original session 
catalog would.
   
   I also know a few other implementers who have been using this parameter to 
set the Session catalog
   
   Like
   https://docs.delta.io/latest/quick-start.html
   ```
   pyspark --packages io.delta:delta-core_2.12:0.8.0 --conf 
"spark.sql.extensions=io.delta.sql.DeltaSparkSessionExtension" --conf 
"spark.sql.catalog.spark_catalog=org.apache.spark.sql.delta.catalog.DeltaCatalog"
   ```
   
   Maybe we just should lock off this parameter and only allow for setting 
"default catalog" which is now available?
   


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