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Posted to issues@drill.apache.org by "Aman Sinha (JIRA)" <ji...@apache.org> on 2019/03/18 16:13:00 UTC
[jira] [Commented] (DRILL-7108) Statistics adds two exchange
operators
[ https://issues.apache.org/jira/browse/DRILL-7108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795153#comment-16795153 ]
Aman Sinha commented on DRILL-7108:
-----------------------------------
[~rhou] the description seems incomplete and does not match the title which says there are extraneous exchange operators. Can you add the textual plan with and without statistics ?
> Statistics adds two exchange operators
> --------------------------------------
>
> Key: DRILL-7108
> URL: https://issues.apache.org/jira/browse/DRILL-7108
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.16.0
> Reporter: Robert Hou
> Assignee: Gautam Parai
> Priority: Major
> Fix For: 1.16.0
>
>
> TPCH 16 with sf 100 runs 14% slower. Here is the query:
> {noformat}
> select
> p.p_brand,
> p.p_type,
> p.p_size,
> count(distinct ps.ps_suppkey) as supplier_cnt
> from
> partsupp ps,
> part p
> where
> p.p_partkey = ps.ps_partkey
> and p.p_brand <> 'Brand#21'
> and p.p_type not like 'MEDIUM PLATED%'
> and p.p_size in (38, 2, 8, 31, 44, 5, 14, 24)
> and ps.ps_suppkey not in (
> select
> s.s_suppkey
> from
> supplier s
> where
> s.s_comment like '%Customer%Complaints%'
> )
> group by
> p.p_brand,
> p.p_type,
> p.p_size
> order by
> supplier_cnt desc,
> p.p_brand,
> p.p_type,
> p.p_size;
> {noformat}
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