[jira] Commented: (PIG-767) Schema reported from DESCRIBE and actual schema of inner bags are different.

["Richard Ding (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983416#action_12983416 ] 

Richard Ding commented on PIG-767:
----------------------------------


Together with PIG-1786, the output of above describe commands is

{code}
urlContents: {url: bytearray,pg: bytearray}
urlContentsG: {group: bytearray,urlContents: {(url: bytearray,pg: bytearray)}}
urlContentsF: {group: bytearray,{pg: bytearray}}
{code}

should the output for urlContentsF be 

{code}
urlContentsF: {group: bytearray,{(pg: bytearray)}}
{code}


> 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
>
>         Attachments: PIG-767-1.patch, PIG-767-2.patch
>
>
> 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)}. 

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.