Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16826#discussion_r103534150
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -1178,4 +1181,34 @@ class SessionCatalog(
}
}
+ /**
+ * Get an identical copy of the `SessionCatalog`.
+ * The temporary views and function registry are retained.
+ * The table relation cache will not be populated.
+ * @note `externalCatalog` and `globalTempViewManager` are from shared
state, do not need deep
+ * copy. `FunctionResourceLoader` is effectively stateless, also does
not need deep copy.
+ * All arguments passed in should be associated with a particular
`SparkSession`.
+ */
+ def clone(
--- End diff --
I think it's worth to use a better name rather than `clone`. I thought it
should clone all necessary fields inside `SessionCatalog`. But `conf` and
`functionRegistry` are copied by the caller.
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