[GitHub] [spark] srielau commented on pull request #43011: [SPARK-45232][SQL][DOCS] Add missing function groups to SQL references

["srielau (via GitHub)" <gi...@apache.org>]

srielau commented on PR #43011:
URL: https://github.com/apache/spark/pull/43011#issuecomment-1730804920

   > > What is the purpose of "lambda function"? All others are type-specific or "functionality"-specific. But lambda is "technology".
   > 
   > lambda functions were already exposed to end users (e.g. https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.functions.array_sort.html#pyspark.sql.functions.array_sort).
   > 
   > I think if we document other functions here, it is better to add lambda functions as well.
   > 
   > > What is the user journey that would drive one to browse lambda functions?
   > 
   > I think this could be an example: when a user try to sort array of structs by a specific order, he may refer to the document of `array_sort`
   
   If I try to find a function that sorts arrays I will try to find that function under collection functions.
   Just like substr() is not a math function, even though most of its arguments are integers. Substr operates on strings...
   array_sort operates on arrays.
   
   


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