iRakson commented on issue #27759: [SPARK-31008][SQL]Support json_array_length 
function
URL: https://github.com/apache/spark/pull/27759#issuecomment-593461310
 
 
   > @iRakson What is the use case when you need to know length w/o full 
parsing? Whereas you can apply `size` after `from_json()`.
   
   There are cases where we need json arrays whose size is greater than a 
certain threshold. At the moment we have to parse all the json arrays and then 
only we can decide whether that json array is needed or not. 
   This problem can be solved by using this function.
   There can be many other such scenarios where users first want to know the 
size of json array.

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