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https://issues.apache.org/jira/browse/PIG-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591923#action_12591923
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Santhosh Srinivasan commented on PIG-158:
-----------------------------------------
Pi,
In principle, I agree with your views on nesting. I see your concern on having
nested operators with some of them floating around. With the nested plans, we
should not be having operators floating around.
2.
I agree with you on point 2 about LOProject. In my previous comment, I had it
the other way around.
8.
Yes, flatten is associated with each column of LOGenerate. The columns
themselves are expression operators and I thought it was better if its an
attribute of the operator.
Generate is also used for a couple of things:
i. In Group and Cogroup, the group by columns are wrapped in LOGenerate
ii. In nested statements in foreach, the expression operators are wrapped in
LOGenerate. In the example below, b refers to the column in c. LOGenerate
wraps up b as distinct expects a relational operator.
{code}
foreach c {a = distinct b; generate b;}
{code}
I am able to compile. I had problems with Exectype.LOCAL (at run time) which
has been commented out. Apart from that, I am having trouble with instantiating
functions with PigContext.
> Rework logical plan
> -------------------
>
> Key: PIG-158
> URL: https://issues.apache.org/jira/browse/PIG-158
> Project: Pig
> Issue Type: Sub-task
> Components: impl
> Reporter: Alan Gates
> Assignee: Alan Gates
> Attachments: logical_operators.patch, logical_operators_rev_1.patch,
> logical_operators_rev_2.patch, logical_operators_rev_3.patch,
> parser_changes.patch, ParserErrors.txt, visitorWalker.patch
>
>
> Rework the logical plan in line with
> http://wiki.apache.org/pig/PigExecutionModel
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