Hive compatibility is not a strong requirement for Spark SQL, and for round, SQLServer also returns the same type as input, see https://docs.microsoft.com/en-us/sql/t-sql/functions/round-transact-sql#return-types <https://docs.microsoft.com/en-us/sql/t-sql/functions/round-transact-sql#return-types>
> On 4 Jul 2017, at 5:22 PM, Anton Okolnychyi <anton.okolnyc...@gmail.com> > wrote: > > Hi all, > > I have a question regarding the round() function, which was developed long > time ago as SPARK-8159. Currently, the return type is exactly as the input > type. That is reasonable, but does not match with Hive. As I understand, Hive > produces either double or decimal as output (see here > <https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF> for > details). > > I know that some functions (e.g., ceil and floor) were updated to match the > behavior of Hive (e.g., return types). Shouldn't it be the same here? > > Best, > Anton
