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https://issues.apache.org/jira/browse/PIG-3367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13695856#comment-13695856
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Aniket Mokashi commented on PIG-3367:
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bq. {code}B = FOREACH A GENERATE a, b, c ASSERT a >= 0, b IS NOT NULL;{code}
I think this is a little ambiguous. Does that mean following is a right syntax?
{code}B = FOREACH A GENERATE a, b, c ASSERT d >= 0;{code}
I think assert should be it's own statement- just like other languages.
bq. A UDF can stop the job by throwing an exception. Although the task will
retry before failing completely.
Do we want to have a mechanism to identify and fast-fail? (It would be hacky,
(publish a counter and client kills it etc.) but useful for this case).
> Add assert keyword (operator) in pig
> ------------------------------------
>
> Key: PIG-3367
> URL: https://issues.apache.org/jira/browse/PIG-3367
> Project: Pig
> Issue Type: New Feature
> Components: parser
> Reporter: Aniket Mokashi
> Assignee: Aniket Mokashi
>
> Assert operator can be used for data validation. With assert you can write
> script as following-
> {code}
> a = load 'something' as (a0:int, a1:int);
> assert a by a0 > 0, 'a cant be negative for reasons';
> {code}
> This script will fail if assert is violated.
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