[GitHub] [flink] liuyongvs commented on pull request #22917: [FLINK-32498][table] Fix the problem of array_max return type, it sho…

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liuyongvs commented on PR #22917:
URL: https://github.com/apache/flink/pull/22917#issuecomment-1619348688

   hi @hanyuzheng7 , you may don't understand the real problem when you 
reviewed.
   i submit the comments before, just for convenient to review.
   if you test empty array in sql-client. you should create function as 
array_empty using  ***. CreateEmptyArray
   then select array_max(array_empty())
   
   ```
   comments:
   why not add unit test
   new Integer[]{}, because the flink's array constuctor function is different 
from spark
   flink should contain at least 1 args.
   spark can contain zero arg, for example array()
   but they both can be empty array, for example, udf, user can constuct empty 
array by themself
   ```
   
   
   
   > Although after adding this test case, all test can pass. But the 
sql-client also report error.
   > 
   > <img alt="Screenshot 2023-07-03 at 5 20 00 PM" width="980" 
src="https://user-images.githubusercontent.com/135176127/250695447-f968c8bd-1079-4b19-86d9-4151e9a976ca.png";>
 <img alt="Screenshot 2023-07-03 at 5 41 38 PM" width="667" 
src="https://user-images.githubusercontent.com/135176127/250697170-143d69db-6007-4539-b97f-3448d666f37f.png";>
   
   


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