leanken edited a comment on pull request #29304: URL: https://github.com/apache/spark/pull/29304#issuecomment-667783096
 this is quite the same with expansion, first it go through all the data in buildSide, to gather information about which column might have exists with null values, and let's say there are c1 c2 c3 in buildSide, after scan, found that only c1 c2 with null values then left record (1, 2, 3) will try to found match (1, null, 3) (null, 2, 3) (null, null, 3) And what i am trying to do is that I will not scan the buildSide to gather null information, I just assume that every column might have the null value, and with all combination of null padding. ---------------------------------------------------------------- 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]
