Re: [HACKERS] Parallel Index-only scan - Mailing list pgsql-hackers

From Rahila Syed
Subject Re: [HACKERS] Parallel Index-only scan
Date
Msg-id CAH2L28vhK_2zC-eO4iKR_ow6=nz2K=4qa3wQjQLvifHXVs1ACQ@mail.gmail.com
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In response to Re: [HACKERS] Parallel Index-only scan  (Amit Kapila <amit.kapila16@gmail.com>)
Responses Re: [HACKERS] Parallel Index-only scan  (Rafia Sabih <rafia.sabih@enterprisedb.com>)
List pgsql-hackers
Hello,

On applying the patch on latest master branch and running regression tests following failure occurs.
I applied it on latest parallel index scan patches as given in the link above.

*** /home/rahila/postgres/postgres/src/test/regress/expected/select_parallel.out    2017-01-03 14:06:29.122022780 +0530
--- /home/rahila/postgres/postgres/src/test/regress/results/select_parallel.out 2017-01-12 14:35:56.652712622 +0530
***************
*** 92,103 ****
  explain (costs off)
    select  sum(parallel_restricted(unique1)) from tenk1
    group by(parallel_restricted(unique1));
!                      QUERY PLAN                    
! ----------------------------------------------------
   HashAggregate
     Group Key: parallel_restricted(unique1)
!    ->  Index Only Scan using tenk1_unique1 on tenk1
! (3 rows)

  set force_parallel_mode=1;
  explain (costs off)
--- 92,105 ----
  explain (costs off)
    select  sum(parallel_restricted(unique1)) from tenk1
    group by(parallel_restricted(unique1));
!                             QUERY PLAN                            
! -------------------------------------------------------------------
   HashAggregate
     Group Key: parallel_restricted(unique1)
!    ->  Gather
!          Workers Planned: 4
!          ->  Parallel Index Only Scan using tenk1_unique1 on tenk1
! (5 rows)

IIUC, parallel operation being performed here is fine as parallel restricted function occurs above Gather node
and just the expected output needs to be changed.

Thank you,
Rahila Syed

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