[jira] [Created] (SPARK-16904) Removal of Hive Built-in Hash Functions and TestHiveFunctionRegistry

["Xiao Li (JIRA)" <ji...@apache.org>]

Xiao Li created SPARK-16904:
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             Summary: Removal of Hive Built-in Hash Functions and TestHiveFunctionRegistry
                 Key: SPARK-16904
                 URL: https://issues.apache.org/jira/browse/SPARK-16904
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Xiao Li


Currently, the Hive built-in `hash` function is not being used in Spark since Spark 2.0. The public interface does not allow users to unregister the Spark built-in functions. Thus, users will never use Hive's built-in `hash` function. 

The only exception here is `TestHiveFunctionRegistry`, which allows users to unregister the built-in functions. Thus, we can load Hive's hash function in the test cases. If we disable it, 10+ test cases will fail because the results are different from the Hive golden answer files.

This PR is to remove `hash` from the list of `hiveFunctions` in `HiveSessionCatalog`. It will also remove `TestHiveFunctionRegistry`. This removal makes us easier to remove `TestHiveSessionState` in the future.




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