[jira] [Commented] (PIG-1989) complex type casting should return null on casting failure

["Daniel Dai (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025011#comment-13025011 ] 

Daniel Dai commented on PIG-1989:
---------------------------------

I tried some test cases, seems currently we set the inner fields which cannot cast to null:

{code}
input:
(a,b,3)

a = load '1.txt' as (t:tuple(i0, i1, i2));
b = foreach a generate (tuple(int,int,int))t;

We get: ((,,3))
{code}

{code}
input:
{(a,1)}

a = load '1.txt' as (a0:bag{t:tuple(i0,i1)});
b = foreach a generate (bag{tuple(int,int)})a0;

We get: ({(,1)})
{code}

{code}
input:
[key#value]

a = load '1.txt' as (m:map[]);
b = foreach a generate (map[int])m;
dump b;

We get: ([key#])
{code}

Sounds Ok to me. Thejas, do you see something else, or you feel this is not proper?

> complex type casting should return null on casting failure 
> -----------------------------------------------------------
>
>                 Key: PIG-1989
>                 URL: https://issues.apache.org/jira/browse/PIG-1989
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.9.0
>            Reporter: Thejas M Nair
>            Assignee: Daniel Dai
>             Fix For: 0.9.0
>
>
> When casting fails for complex objects, pig is currently returning un-casted object if the cast fails. 
> It should return null instead. That is consistent with the behavior when casting to other basic types. 

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