sarutak edited a comment on pull request #34593:
URL: https://github.com/apache/spark/pull/34593#issuecomment-978897180


   I investigated whether the major DBMS and query processing systems 
(PostgreSQL, BigQuery, Snowflake, MySQL, SAP HANA, MS SQL Server, Firebird, 
DB2, Teradata, Hive) support the third parameter of `round` but I found only 
SAP HANA and MS SQL Server do.
   
   @sathiyapk 
   How many users need to change the rounding modes and how often the 
additional rounding modes are used?
   If users really need `up`, `down` and `half_down`, I think it's not 
difficult to implement a UDF by using `BigDecimal.setScale`.
   
   @HyukjinKwon @gengliangwang What do you think?
   


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