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https://issues.apache.org/jira/browse/HIVE-16605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16355910#comment-16355910
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Vineet Garg commented on HIVE-16605:
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Need to document the following:
* Hive Conf {{hive.constraint.notnull.enforce}}
* NOT NULL constraint is enforced for INSERT/MERGE/UPDATE statements.
> Enforce NOT NULL constraints
> ----------------------------
>
> Key: HIVE-16605
> URL: https://issues.apache.org/jira/browse/HIVE-16605
> Project: Hive
> Issue Type: New Feature
> Affects Versions: 3.0.0
> Reporter: Carter Shanklin
> Assignee: Vineet Garg
> Priority: Major
> Labels: TODOC3.0
> Attachments: HIVE-16605.1.patch, HIVE-16605.2.patch,
> HIVE-16605.3.patch, HIVE-16605.4.patch, HIVE-16605.5.patch
>
>
> Since NOT NULL is so common it would be great to have tables start to enforce
> that.
> [~ekoifman] described a possible approach in HIVE-16575:
> {quote}
> One way to enforce not null constraint is to have the optimizer add
> enforce_not_null UDF which throws if it sees a NULL, otherwise it's pass
> through.
> So if 'b' has not null constraint,
> Insert into T select a,b,c... would become
> Insert into T select a, enforce_not_null(b), c.....
> This would work for any table type.
> {quote}
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