[TAJO-1774] Cannot run INTERSECT/EXCEPT clause with inter-subquery that has same column name

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 0.11.0
• Labels: sql
• Assignee: Unassigned
• Reporter: Dongkyu Hwangbo
• Created: 17/Aug/15 02:59
• Updated: 17/Aug/15 02:59

Description

This is TPC-DS q38.

select count(*) from (
    select distinct c_last_name, c_first_name, d_date
    from store_sales, date_dim, customer
          where store_sales.ss_sold_date_sk = date_dim.d_date_sk
      and store_sales.ss_customer_sk = customer.c_customer_sk
      and d_month_seq between 1200 and 1200 + 11
  intersect
    select distinct c_last_name, c_first_name, d_date
    from catalog_sales, date_dim, customer
          where catalog_sales.cs_sold_date_sk = date_dim.d_date_sk
      and catalog_sales.cs_bill_customer_sk = customer.c_customer_sk
      and d_month_seq between 1200 and 1200 + 11
  intersect
    select distinct c_last_name, c_first_name, d_date
    from web_sales, date_dim, customer
          where web_sales.ws_sold_date_sk = date_dim.d_date_sk
      and web_sales.ws_bill_customer_sk = customer.c_customer_sk
      and d_month_seq between 1200 and 1200 + 11
) hot_cust
limit 100;

when i enter this query, tsql gives me this error message.

ERROR: column name 'tpcds.customer.c_last_name (TEXT), tpcds.customer.c_last_name (TEXT)' is ambiguous

so, to run this query, I rewrite query like below.

drop table temp1;
drop table temp2;
drop table temp3;

create table temp1(c_last_name text, c_first_name text, d_date date);
create table temp2(c_last_name text, c_first_name text, d_date date);
create table temp3(c_last_name text, c_first_name text, d_date date);

insert overwrite into temp1
select distinct c_last_name, c_first_name, d_date
    from store_sales, date_dim, customer
          where store_sales.ss_sold_date_sk = date_dim.d_date_sk
      and store_sales.ss_customer_sk = customer.c_customer_sk
      and d_month_seq between 1200 and 1200 + 11;

insert overwrite into temp2
select distinct c_last_name, c_first_name, d_date
    from catalog_sales, date_dim, customer
          where catalog_sales.cs_sold_date_sk = date_dim.d_date_sk
      and catalog_sales.cs_bill_customer_sk = customer.c_customer_sk
      and d_month_seq between 1200 and 1200 + 11;

insert overwrite into temp3
    select distinct c_last_name, c_first_name, d_date
    from web_sales, date_dim, customer
          where web_sales.ws_sold_date_sk = date_dim.d_date_sk
      and web_sales.ws_bill_customer_sk = customer.c_customer_sk
      and d_month_seq between 1200 and 1200 + 11;

select count(*)
from temp1, temp2, temp3
where temp1.c_last_name = temp2.c_last_name
and temp1.c_first_name = temp2.c_last_name
and temp1.d_date = temp2.d_date
and temp2.c_last_name = temp3.c_last_name
and temp2.c_first_name = temp3.c_last_name
and temp2.d_date = temp3.d_date
and temp3.c_last_name = temp1.c_last_name
and temp3.c_first_name = temp1.c_last_name
and temp3.d_date = temp1.d_date;

then tajo can run with this query.
I think tajo cannot recognize multiple subquery with same column name.

same problem is occured with TPC-DS q87. Here is query.

select count(*) 
from ((select distinct c_last_name, c_first_name, d_date
       from store_sales, date_dim, customer
       where store_sales.ss_sold_date_sk = date_dim.d_date_sk
         and store_sales.ss_customer_sk = customer.c_customer_sk
         and d_month_seq between 1200 and 1200+11)
       except
      (select distinct c_last_name, c_first_name, d_date
       from catalog_sales, date_dim, customer
       where catalog_sales.cs_sold_date_sk = date_dim.d_date_sk
         and catalog_sales.cs_bill_customer_sk = customer.c_customer_sk
         and d_month_seq between 1200 and 1200+11)
       except
      (select distinct c_last_name, c_first_name, d_date
       from web_sales, date_dim, customer
       where web_sales.ws_sold_date_sk = date_dim.d_date_sk
         and web_sales.ws_bill_customer_sk = customer.c_customer_sk
         and d_month_seq between 1200 and 1200+11)
) cool_cust
;