[GitHub] [spark] AngersZhuuuu opened a new pull request #30958: [SPARK-33930][SQL] Spark SQL no serde row format field delimit default value is '\u0001'

[GitBox]

AngersZhuuuu opened a new pull request #30958:
URL: https://github.com/apache/spark/pull/30958


   ### What changes were proposed in this pull request?
   For same SQL
   ```
   SELECT TRANSFORM(a, b, c, null)
   ROW FORMAT DELIMITED
   USING 'cat' 
   ROW FORMAT DELIMITED
   FIELDS TERMINATED BY '&'
   FROM (select 1 as a, 2 as b, 3  as c) t
   ```
   In hive:
   
![image](https://user-images.githubusercontent.com/46485123/103260903-5c968a80-49da-11eb-9675-7c66b2ee35fb.png)
   
   In Spark 
   
![image](https://user-images.githubusercontent.com/46485123/103260912-67511f80-49da-11eb-93df-663543c8e91f.png)
   
   We should keep same. Change default ROW FORMAT FIELD DELIMIT to `\u0001`
   
   ### Why are the changes needed?
   Keep same behavior with hive
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   
   ### How was this patch tested?
   Added UT
   


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