19kka opened a new pull request #25450: [SPARK-23793][SQL]Handle database names 
in spark.udf.register()
URL: https://github.com/apache/spark/pull/25450
   ## What changes were proposed in this pull request?
   Current version:
   spark.udf.register("testdb.testfunc", (a: Int) => a + 1)
   sql("select testdb.testfunc(1)").show 
   //throw NoSuchFunctionException
   //org.apache.spark.sql.AnalysisException: Undefined function: 'testfunc'. 
This function is neither a registered temporary function nor a permanent 
function registered in the database 'testdb'.; line 1 pos 7 
   Parser the register function name and database name before 
`createOrReplaceTempFunction` after this patch, the result will be correctly 
and has no Exception
   ## How was this patch tested?
   Passed existing tests. Manually test for performance.

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