Flatten semantics are unknown ----------------------------- Key: PIG-822 URL: https://issues.apache.org/jira/browse/PIG-822 Project: Pig Issue Type: Bug Components: documentation Reporter: George Mavromatis Priority: Critical
There is no formal specification of the flatten keyword in http://hadoop.apache.org/pig/docs/r0.2.0/piglatin.html There are only some examples. I have found flatten to be very fragile and unpredictable with the data types it reads and creates. I have wasted too many hours (and Viraj too) trying to figure out its peculiarities, the latest of which is here: http://bug.corp.yahoo.com/show_bug.cgi?id=2768016 comment #15 Please document: Flatten to be explained formally in its own dedicated section: What are the valid input types, the output types it creates, what transformation it does from input to output and how the resulting data are named. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.