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https://issues.apache.org/jira/browse/PIG-3670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14229455#comment-14229455
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Russell Jurney commented on PIG-3670:
-------------------------------------
The syntax ended up being:
ASSERT my_relation BY field1 IS NOT NULL, 'Oh no, field1 is null';
> Fix assert in Pig script
> ------------------------
>
> Key: PIG-3670
> URL: https://issues.apache.org/jira/browse/PIG-3670
> Project: Pig
> Issue Type: Bug
> Components: impl
> Reporter: Daniel Dai
> Assignee: Lorand Bendig
> Fix For: 0.12.1, 0.13.0
>
> Attachments: PIG-3670-1.patch, PIG-3670-2.patch,
> PIG-3670-2_addition.patch
>
>
> PIG-3367 introduce "assert" keyword. However, it can only be used in Java
> embedding, when use registerQuery. In Pig script or Grunt shell, GruntParser
> will complain.
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