Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15513
Regarding the function descriptions, you can easily find many online
available documents from the traditional RDBMS vendors. Instead of writing them
by yourself, you can check what they said in the similar functions. Below is
another example from Teradata:
[SQL_Reference_--_Functions_Operators_Expressions_Predicates.pdf](https://github.com/apache/spark/files/548369/SQL_Reference_--_Functions_Operators_Expressions_Predicates.pdf)
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