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Posted to dev@pig.apache.org by "Richard Ding (JIRA)" <ji...@apache.org> on 2009/12/09 23:43:18 UTC
[jira] Commented: (PIG-973) type resolution inconsistency
[ https://issues.apache.org/jira/browse/PIG-973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788366#action_12788366 ]
Richard Ding commented on PIG-973:
----------------------------------
This following script also produces an error:
{code}
A = load 'input' as (id:int, g:bag{t:tuple(u:int)});;
B = foreach A generate id, SUM(g); ;
dump B;
{code}
The problem appears to be with the patch of PIG-315, which only pushed the exception from compile-time to runtime for the script below:
{code}
a = load 'studenttab10k' as (name:chararray, age:int, gpa:double);
b = foreach a generate (long)age as age, (int)gpa as gpa;
c = foreach b generate SUM(age), SUM(gpa);
dump c;
{code}
Actually, one can argue that this is an invalid script -- the input type of the eval function SUM is a bag of numbers, not a number. So it should be caught at compile-time (by the parser if posible).
> type resolution inconsistency
> -----------------------------
>
> Key: PIG-973
> URL: https://issues.apache.org/jira/browse/PIG-973
> Project: Pig
> Issue Type: Bug
> Reporter: Olga Natkovich
> Assignee: Richard Ding
>
> This script works:
> A = load 'test' using PigStorage(':') as (name: chararray, age: int, gpa: float);
> B = group A by age;
> C = foreach B {
> D = filter A by gpa > 2.5;
> E = order A by name;
> F = A.age;
> describe F;
> G = distinct F;
> generate group, COUNT(D), MAX (E.name), MIN(G.$0);}
> dump C;
> This one produces an error:
> A = load 'test' using PigStorage(':') as (name: chararray, age: int, gpa: float);
> B = group A by age;
> C = foreach B {
> D = filter A by gpa > 2.5;
> E = order A by name;
> F = A.age;
> G = distinct F;
> generate group, COUNT(D), MAX (E.name), MIN(G);}
> dump C;
> Notice the difference in how MIN is passed the data.
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