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Date: Thu, 5 Jan 2017 04:37:58 +0000 (UTC)
From: "Vineet Garg (JIRA)" <jira@apache.org>
To: issues@hive.apache.org
Message-ID: <JIRA.13032155.1483589331000.646714.1483591078647@Atlassian.JIRA>
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Subject: [jira] [Updated] (HIVE-15544) Support scalar subqueries
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archived-at: Thu, 05 Jan 2017 04:38:00 -0000


     [ https://issues.apache.org/jira/browse/HIVE-15544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vineet Garg updated HIVE-15544:
-------------------------------
    Status: Patch Available  (was: Open)

This first patch is a preliminary patch which has support for scalar subqueries in WHERE/HAVING. 
This patch is missing the following known stuff:
* q tests
* Check to ensure that subquery expression is producing exactly one row
* Check to disallow various subquery restrictions (this patch currently disables those check since those doesn't work with scalar queries)

> Support scalar subqueries
> -------------------------
>
>                 Key: HIVE-15544
>                 URL: https://issues.apache.org/jira/browse/HIVE-15544
>             Project: Hive
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>              Labels: sub-query
>         Attachments: HIVE-15544.1.patch
>
>
> Currently HIVE only support IN/EXISTS/NOT IN/NOT EXISTS subqueries. HIVE doesn't allow sub-queries such as:
> {code}
> explain select  a.ca_state state, count(*) cnt
>  from customer_address a
>      ,customer c
>      ,store_sales s
>      ,date_dim d
>      ,item i
>  where       a.ca_address_sk = c.c_current_addr_sk
>  	and c.c_customer_sk = s.ss_customer_sk
>  	and s.ss_sold_date_sk = d.d_date_sk
>  	and s.ss_item_sk = i.i_item_sk
>  	and d.d_month_seq = 
>  	     (select distinct (d_month_seq)
>  	      from date_dim
>                where d_year = 2000
>  	        and d_moy = 2 )
>  	and i.i_current_price > 1.2 * 
>              (select avg(j.i_current_price) 
>  	     from item j 
>  	     where j.i_category = i.i_category)
>  group by a.ca_state
>  having count(*) >= 10
>  order by cnt 
>  limit 100;
> {code}
> We initially plan to support such scalar subqueries in filter i.e. WHERE and HAVING


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