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https://issues.apache.org/jira/browse/HIVE-556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Min Zhou updated HIVE-556:
--------------------------
Description:
Right now , hive only support equal joins . Sometimes it's not enough, we must
consider implementing theta joins like
{code:sql}
SELECT
a.subid, a.id, t.url
FROM
tbl t JOIN aux_tbl a ON t.url rlike a.url_pattern
WHERE
t.dt='20090609'
AND a.dt='20090609';
{code}
any condition expression following 'ON' is appropriate.
was:
Right now , hive only support equal joins . Somethings it's not enough, we
must consider implementing theta joins like
{code:sql}
SELECT
a.subid, a.id, t.url
FROM
tbl t JOIN aux_tbl a ON t.url rlike a.url_pattern
WHERE
t.dt='20090609'
AND a.dt='20090609';
{code}
any condition expression following 'ON' is appropriate.
> let hive support theta join
> ---------------------------
>
> Key: HIVE-556
> URL: https://issues.apache.org/jira/browse/HIVE-556
> Project: Hadoop Hive
> Issue Type: New Feature
> Affects Versions: 0.4.0
> Reporter: Min Zhou
> Fix For: 0.4.0
>
>
> Right now , hive only support equal joins . Sometimes it's not enough, we
> must consider implementing theta joins like
> {code:sql}
> SELECT
> a.subid, a.id, t.url
> FROM
> tbl t JOIN aux_tbl a ON t.url rlike a.url_pattern
> WHERE
> t.dt='20090609'
> AND a.dt='20090609';
> {code}
> any condition expression following 'ON' is appropriate.
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