wombatu-kun opened a new pull request, #16591:
URL: https://github.com/apache/iceberg/pull/16591

   ## Summary
   
   Closes #14424.
   
   `spark.sql.catalog.spark_catalog.default-namespace` has no observable effect 
when used with `SparkSessionCatalog`. Spark initializes the session catalog's 
current namespace from its built-in V1 `SessionCatalog`, which bypasses the V2 
catalog's `defaultNamespace()`. The current docs list `default-namespace` under 
"Common configuration properties" without flagging this gap, which led the 
reporter to expect it to work.
   
   This PR adds a note in the "Replacing the session catalog" section pointing 
users to Spark's `spark.sql.catalog.spark_catalog.defaultDatabase` instead, 
which the reporter confirmed works as a workaround.


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