cloud-fan commented on code in PR #53570:
URL: https://github.com/apache/spark/pull/53570#discussion_r2870441275
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala:
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@@ -84,6 +94,224 @@ class SessionCatalog(
import SessionCatalog._
import CatalogTypes.TablePartitionSpec
+ // Marker database name for temporary functions to distinguish from builtin
functions
+ /**
+ * Database qualifier used to store temporary functions in the function
registry.
+ * Temporary functions use composite keys to coexist with builtin functions
of the same name:
+ * - Builtin functions: FunctionIdentifier(name, None)
Review Comment:
```suggestion
* - Builtin functions: FunctionIdentifier(name, None, None)
```
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