[PIG-822] Flatten semantics are unknown

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Component/s: documentation
• Assignee: Benjamin Reed
• Reporter: George Mavromatis
• Created: 29/May/09 02:05
• Updated: 25/Mar/10 00:12
• Resolved: 23/Sep/09 00:21

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.

Issue Links

• is part of: PIG-812 COUNT(*) does not work