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https://issues.apache.org/jira/browse/PIG-822?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olga Natkovich updated PIG-822:
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    Description: 
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. 

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.



  was:
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.




> 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. 
> 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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