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https://issues.apache.org/jira/browse/HIVE-15251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HIVE-15251 started by Jesus Camacho Rodriguez.
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> Provide support for complex expressions in ON clauses for OUTER joins
> ---------------------------------------------------------------------
>
> Key: HIVE-15251
> URL: https://issues.apache.org/jira/browse/HIVE-15251
> Project: Hive
> Issue Type: Bug
> Components: CBO, Parser
> Affects Versions: 2.2.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
>
> Follow-up of HIVE-15211.
> Currently, we have some restrictions on the predicates that we can use in ON
> clauses for outer joins.
> This patch is an extension to overcome these restrictions. Follow-up work
> will focus on identifying some cases, such as disjunctive predicates, that
> can be run more efficiently than with a cartesian product.
> It will allow to write queries that currently fail in Hive such as:
> {code:sql}
> -- Disjunctions
> SELECT *
> FROM src1 LEFT OUTER JOIN src
> ON (src1.key=src.key
> OR src1.value between 100 and 102
> OR src.value between 100 and 102)
> LIMIT 10;
> -- Conjunction with multiple inputs references in one side
> SELECT *
> FROM src1 RIGHT OUTER JOIN src
> ON (src1.key+src.key >= 100
> AND src1.key+src.key <= 102)
> LIMIT 10;
> -- Conjunct with no references
> SELECT *
> FROM src1 FULL OUTER JOIN src
> ON (src1.value between 100 and 102
> AND src.value between 100 and 102
> AND true)
> LIMIT 10;
> {code}
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