Github user ouyangxiaochen commented on the issue:
https://github.com/apache/spark/pull/17681
The new synax of creating function like this `CREATE (OR REPLACE)?
TEMPORARY? FUNCTION (IF NOT EXISTS)? qualifiedName AS className=STRING (USING
resource (',' resource)*)? `
OK, let's combing the logic :
1. creating the function with both `IF NOT EXISTS` and `REPLACE` is not
allowed.
2. It is not allowed to define a `TEMPORARY `function with `IF NOT EXISTS`.
3. specifying a database in `CREATE TEMPORARY FUNCTION `is not allowed.
4. creating the function which is exists in hivemetastore and
functionRegistry:
a. created only with `IF NOT EXISTS`, we will override the function.
b. create only with `OR REPLACE`,we will create new one.
@gatorsmile @cloud-fan CC and give me some suggestion, Thanks!
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