Major Description
Currently, the unquoted string of a function identifier is being used as the function identifier in the function registry. This could cause the incorrect the behavior when users use `.` in the function names.
As an example, Spark can resolve a function like this
SELECT `d100.udf100`(`emp`.`name`) FROM `emp`;
Although the function name is wrapped with backticks, Spark still resolves it as database name + function name, which is wrong.
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SPARK-34971 The view with udf created by hive1.x cannot be read by spark
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