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

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

zhengruifeng commented on PR #43011:
URL: https://github.com/apache/spark/pull/43011#issuecomment-1730672720

   > 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` 


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