[jira] [Created] (HIVE-15251) Provide support for complex expressions in ON clauses for OUTER joins

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

Jesus Camacho Rodriguez created HIVE-15251:
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             Summary: 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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