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https://issues.apache.org/jira/browse/PIG-3269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855003#comment-13855003
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Cheolsoo Park commented on PIG-3269:
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No, it doesn't.
If you do, {{"( tuple ) IN ( \{ bag \} )"}}, it will error out because the
types of lhs and rhs are not compatible, i.e. tuple cannot be compared with
bag. The IN is internally converted to concatenated OR expressions, i.e. {{(lhs
== rhs_1) OR (lhs == rhs_2)}}, so the type of lhs and rhs must be the same.
> In operator support
> -------------------
>
> Key: PIG-3269
> URL: https://issues.apache.org/jira/browse/PIG-3269
> Project: Pig
> Issue Type: New Feature
> Components: internal-udfs, parser
> Affects Versions: 0.11
> Reporter: Cheolsoo Park
> Assignee: Cheolsoo Park
> Fix For: 0.12.0
>
> Attachments: PIG-3269-2.patch, PIG-3269-3.patch, PIG-3269-4.patch,
> PIG-3269-5.patch, PIG-3269.patch
>
>
> This is another language improvement using the same approach as in PIG-3268.
> Currently, Pig has no support for IN operator. To mimic it, users often have
> to concatenate several OR operators.
> For example,
> {code}
> a = LOAD '1.txt' USING PigStorage(',') AS (i:int);
> b = FILTER a BY
> (i == 1) OR
> (i == 22) OR
> (i == 333) OR
> (i == 4444) OR
> (i == 55555);
> {code}
> But this can be re-rewritten in a more compact manner using IN operator as
> follows:
> {code}
> a = LOAD '1.txt' USING PigStorage(',') AS (i:int);
> b = FILTER a BY i IN (1,22,333,4444,55555);
> {code}
> I propose that we implement IN operator in the following manner:
> * Add built-in UDFs that take expressions as args. Take for example the
> aforementioned IN operator, we can define a UDF such as {{builtInUdf(i, 1,
> 22, 333, 4444, 55555)}}.
> * Add syntactical sugar for these built-in UDFs.
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