Github user stanzhai commented on the issue:
https://github.com/apache/spark/pull/18544
@cloud-fan
User's hive UDFs are registered in externalCatalog which not exists in
functionRegistry.
It will throws a NoSuchFunctionException when an exception is encountered
while loading a hive UDF.
But we should throw the original exception.
So, I just fix the issue by:
```
if (functionRegistry.functionExists(funcName)) {
throw error
} else {
...
}
```
changed to:
```
if (super.functionExists(name)) {
throw error
} else {
...
}
```
The following is implementation of `super.functionExists`
```
def functionExists(name: FunctionIdentifier): Boolean = {
val db = formatDatabaseName(name.database.getOrElse(getCurrentDatabase))
requireDbExists(db)
functionRegistry.functionExists(name) ||
externalCatalog.functionExists(db, name.funcName)
}
```
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