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From "Richard Ding (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-1998) Allow macro to return void
Date Wed, 20 Apr 2011 19:25:05 GMT

     [ https://issues.apache.org/jira/browse/PIG-1998?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Richard Ding updated PIG-1998:
------------------------------

    Attachment: PIG-1998_1.patch

> Allow macro to return void
> --------------------------
>
>                 Key: PIG-1998
>                 URL: https://issues.apache.org/jira/browse/PIG-1998
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>    Affects Versions: 0.9.0
>            Reporter: Richard Ding
>            Assignee: Richard Ding
>             Fix For: 0.9.0
>
>         Attachments: PIG-1998_1.patch
>
>
> Pig macro is allowed to not have output alias. But this property isn't clear from macro
definition and macro invocation (macro inline). Here we propose to make it clear:
> 1. If a macro doesn't output any alias, it must specify void as return value. For example:
> {code}  
> define mymacro(...) returns void {
>    ... ...
> };
> {code}
> 2. If a macro doesn't output any alias, it must be invoked without return value. For
example, to invoke above macro, just specify:
> {code}
> mymacro(...);
> {code}
> 3. Any non-void return alias in the macro definition must exist in the macro body and
be prefixed with $. For example:
> {code}  
> define mymacro(...) returns B {
>    ... ...
>    $B = filter ...;
> };
> {code}

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