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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