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https://issues.apache.org/jira/browse/PIG-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12599455#action_12599455
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Santhosh Srinivasan commented on PIG-158:
-----------------------------------------
The discussion on LOProject has moved to the wiki published by Pi. My comments
on LOSentinel:
<quote>
1. Introduce LOSentinel which can be used to get 1 field out of outer plan
(from tuple or bag).
2. Use LOProject only when projecting tuples or bags (and output tuple/bag)
</quote>
Questions:
1. Is the role of LOSentinel to be a bridge from outer plan to inner plan only,
i.e., project a column from the outer plan?
2. In the example given below, how will the translation of A.$0 and B.$1 look?
Since LOProject is proposed to be used only for projecting tuples or bags, if
$0 and $1 are say integer and float respectively, do we use LOProject or
LOSentinel?
{code}
A = load 'input1';
B = load 'input2';
C = cogroup A by $0, B by $0;
D = foreach C generate A.$0 * B.$1;
{code}
> 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, parser_changes_v1.patch, parser_changes_v2.patch,
> parser_changes_v3.patch, parser_changes_v4.patch, ParserErrors.txt,
> visitorWalker.patch
>
>
> Rework the logical plan in line with
> http://wiki.apache.org/pig/PigExecutionModel
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