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Date: Thu, 5 Jan 2017 04:08:58 +0000 (UTC)
From: "Vineet Garg (JIRA)" <jira@apache.org>
To: dev@hive.apache.org
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Subject: [jira] [Created] (HIVE-15544) Support scalar subqueries
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archived-at: Thu, 05 Jan 2017 04:09:05 -0000

Vineet Garg created HIVE-15544:
----------------------------------

             Summary: 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


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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