Github user kunalkhamar commented on a diff in the pull request:
https://github.com/apache/spark/pull/16826#discussion_r103060505
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -1178,4 +1178,36 @@ class SessionCatalog(
}
}
+ /**
+ * Get an identical copy of the `SessionCatalog`.
+ * The temporary tables and function registry are retained.
+ * The table relation cache will not be populated.
+ * @note `externalCatalog` and `globalTempViewManager` are from shared
state, don't 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 copy(
+ conf: CatalystConf,
+ hadoopConf: Configuration,
+ functionRegistry: FunctionRegistry,
+ parser: ParserInterface): SessionCatalog = {
+
+ val catalog = new SessionCatalog(
+ externalCatalog,
+ globalTempViewManager,
+ functionResourceLoader,
+ functionRegistry,
+ conf,
+ hadoopConf,
+ parser)
+
+ synchronized {
--- End diff --
Right, I should mention we decided to keep it `synchronized`. `catalog` is
not yet accessible outside local scope.
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