Flatten semantics are unknown
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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.
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