normanj-bitquill commented on PR #3852:
URL: https://github.com/apache/calcite/pull/3852#issuecomment-2226448971

   > @normanj-bitquill
   > 
   > 1. I find different data source has different behaviour about NULL value:
   > 
   > ```
   > spark-sql (default)> select array(1,2)>array(1,null);
   > true
   > Time taken: 0.192 seconds, Fetched 1 row(s)
   > spark-sql (default)> select array(1,2)<array(1,null);
   > false
   > Time taken: 0.127 seconds, Fetched 1 row(s)
   > ```
   > 
   > But this maybe another issue to resolve it.
   > 
   > 2. Please add the code annotation before the test to clarify the test. 
Other good to me.
   
   1. I don't see any obvious way to support specifying the null order. It 
might help to consider how it should be configured. When building a Spark 
engine using Calcite, what would the ideal way of specifying whether NULLs 
should be first or last in array comparisons?
   
   2. I'm not sure what you mean. I added a comment before the tests to say 
what they are for.


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