[jira] [Work started] (HIVE-15211) Provide support for complex expressions in ON clauses for INNER joins

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-15211?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-15211 started by Jesus Camacho Rodriguez.
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> Provide support for complex expressions in ON clauses for INNER joins
> ---------------------------------------------------------------------
>
>                 Key: HIVE-15211
>                 URL: https://issues.apache.org/jira/browse/HIVE-15211
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO, Parser
>    Affects Versions: 2.2.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-15211.patch
>
>
> Currently, we have some restrictions on the predicates that we can use in ON clauses for inner joins (we have those restrictions for outer joins too, but we will tackle that in a follow-up). Semantically equivalent queries can be expressed if the predicate is introduced in the WHERE clause, but we would like that user can express it both in ON and WHERE clause, as in standard SQL.
> This patch is an extension to overcome these restrictions for inner joins.
> It will allow to write queries that currently fail in Hive such as:
> {code:sql}
> -- Disjunctions
> SELECT *
> FROM src1 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 JOIN src
> ON (src1.key+src.key >= 100
>   AND src1.key+src.key <= 102)
> LIMIT 10;
> -- Conjunct with no references
> SELECT *
> FROM src1 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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