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https://issues.apache.org/jira/browse/PIG-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12599460#action_12599460
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Santhosh Srinivasan commented on PIG-158:
-----------------------------------------
For the "is null" operator proposed in the execution pipeline functional
specification, there are a couple of options to implement the syntax:
1. SQL like syntax
{code}
A = load 'input1';
B = Filter A by $0 is null;
C = Filter A by $1 is not null;
{code}
2. Procedural language like syntax
{code}
A = load 'input1';
B = Filter A by IsNull($0);
C = Filter A by IsNotNull($1);
{code}
I am leaning towards the SQL like syntax. Wanted to hear from folks on their
preferences and why.
> 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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