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From "Santhosh Srinivasan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-664) Semantics of * is not consistent
Date Tue, 24 Feb 2009 05:20:01 GMT

     [ https://issues.apache.org/jira/browse/PIG-664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Santhosh Srinivasan updated PIG-664:
------------------------------------

    Patch Info: [Patch Available]

> Semantics of * is not consistent
> --------------------------------
>
>                 Key: PIG-664
>                 URL: https://issues.apache.org/jira/browse/PIG-664
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: types_branch
>            Reporter: Santhosh Srinivasan
>            Assignee: Santhosh Srinivasan
>             Fix For: types_branch
>
>         Attachments: PIG-664.patch
>
>
> The semantics of * is not consistent in PIG. The use of * with generate results in the
all the columns of the record being flattened. However, the use of * as an input to a UDF
results in a tuple (wrapped in another tuple). For consistency, * should always result in
all the columns of the record (i.e., flattened). The use of * occurs in:
> 1. Foreach generate: E.g.: foreach input generate *;
> 2. Input to UDFs: E.g. foreach input generate myUDF(*);
> 3. Order by: E.g.: order input by *;
> 4. (Co)Group: E.g.: group a by *; cogroup a by *, b by *;
> In terms of implementation, this involves rolling back the fix introduced in PIG-597
and fixing the following builtin UDFs:
> 1. ARITY - Should return the size of the input tuple instead of extracting the first
column of the input tuple
> 2. SIZE - Should return the size of the input tuple instead of extracting the first column
of the input tuple

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