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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (PIG-767) Schema reported from DESCRIBE and actual schema of inner bags are different.
Date Tue, 04 Jan 2011 01:37:46 GMT

     [ https://issues.apache.org/jira/browse/PIG-767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alan Gates reassigned PIG-767:
------------------------------

    Assignee: Daniel Dai  (was: Alan Gates)

> Schema reported from DESCRIBE and actual schema of inner bags are different.
> ----------------------------------------------------------------------------
>
>                 Key: PIG-767
>                 URL: https://issues.apache.org/jira/browse/PIG-767
>             Project: Pig
>          Issue Type: Bug
>            Reporter: George Mavromatis
>            Assignee: Daniel Dai
>             Fix For: 0.9.0
>
>
> The following script:
> urlContents = LOAD 'inputdir' USING BinStorage() AS (url:bytearray, pg:bytearray);
> -- describe and dump are in-sync
> DESCRIBE urlContents;
> DUMP urlContents;
> urlContentsG = GROUP urlContents BY url;
> DESCRIBE urlContentsG;
> urlContentsF = FOREACH urlContentsG GENERATE group,urlContents.pg;
> DESCRIBE urlContentsF;
> DUMP urlContentsF;
> Prints for the DESCRIBE commands:
> urlContents: {url: chararray,pg: chararray}
> urlContentsG: {group: chararray,urlContents: {url: chararray,pg: chararray}}
> urlContentsF: {group: chararray,pg: {pg: chararray}}
> The reported schemas for urlContentsG and urlContentsF are wrong. They are also against
the section "Schemas for Complex Data Types" in http://wiki.apache.org/pig-data/attachments/FrontPage/attachments/plrm.htm#_Schemas.
> As expected, actual data observed from DUMP urlContentsG and DUMP urlContentsF do contain
the tuple inside the inner bags.
> The correct schema for urlContentsG is:  {group: chararray,urlContents: {t1:(url: chararray,pg:
chararray)}}
> This may sound like a technicality, but it isn't. For instance, a UDF that assumes an
inner bag of {chararray} will not work with {(chararray)}. 

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