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From bangbig <lizhongliangg...@163.com>
Subject how to use UDF or UDAF to implement the keywords like "CASE WHEN a THEN b..."
Date Tue, 17 May 2011 10:53:31 GMT
Hi all,
I find that, to implement such a statement, there are mutiple source files related. GenericUDFCase.java,
GenericUDFWhen.java etc. I want to know how they are related. Could anyone give me some ideas
about this? And is it possible to implement them with UDF? thanks!
Best Regards,
ZL.

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