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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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