huaxingao commented on issue #28290: URL: https://github.com/apache/spark/pull/28290#issuecomment-617556913
@HyukjinKwon @maropu I quickly wrote a paragraph for scalar function. It has to be scalar function because the following paragraph is for aggregation. The definition for scalar function is a bit confusing. Snowflake (https://docs.snowflake.com/en/sql-reference/functions.html) and Oracle (https://docs.oracle.com/cd/E57185_01/IRWUG/ch12s04s01.html) define scalar function as functions opposite to aggregation function, but seems IBM (https://www.ibm.com/support/knowledgecenter/SSEPEK_10.0.0/apsg/src/tpc/db2z_sqlscalarfn.html) uses scalar function for scalar UDF. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
