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https://issues.apache.org/jira/browse/HIVE-15209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15667837#comment-15667837
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Xuefu Zhang commented on HIVE-15209:
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I don't think erring out and saying that "Cartesian products are disabled for
safety reasons" violates compliance. Further I'd argue that being compliant is
not our ultimate goal.
As to b/c, the default has been true since HIVE-12727, which is released in
2.0. I don't think we should make existing user suffer just to make new users
happier.
> Set hive.strict.checks.cartesian.product to false by default
> ------------------------------------------------------------
>
> Key: HIVE-15209
> URL: https://issues.apache.org/jira/browse/HIVE-15209
> Project: Hive
> Issue Type: Bug
> Components: Parser
> Affects Versions: 2.2.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-15209.patch
>
>
> If we aim to make Hive compliant with SQL, w should disable this property by
> default, as expressing a cartesian product, though inefficient, is perfectly
> valid in SQL.
> Further, if we express complex predicates in the ON clause of a SQL query, we
> might not be able to push these predicates to the join operator; however, we
> should still be able to execute the query.
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