Jinfeng Ni created DRILL-1337:
---------------------------------
Summary: TPCH Q13 may return incorrect rows : Drill may
incorrectly pull up a local right filter in a left outer join condition.
Key: DRILL-1337
URL: https://issues.apache.org/jira/browse/DRILL-1337
Project: Apache Drill
Issue Type: Bug
Reporter: Jinfeng Ni
Assignee: Jinfeng Ni
For TPCH Q13, Drill may discard some qualified rows, since Drill pulls up a
local RHS filter in a left outer join, and put it on top of Join. There means
the local RHS is treated as a post-join condition, which will incorrectly
discard some qualified rows.
select
c_count,
count(*) as custdist
from
(
select
c.c_custkey,
count(o.o_orderkey)
from
cp.`tpch/customer.parquet` c
left outer join cp.`tpch/orders.parquet` o
on c.c_custkey = o.o_custkey
and o.o_comment not like '%special%requests%'
group by
c.c_custkey
) as orders (c_custkey, c_count)
group by
c_count
order by
custdist desc,
c_count desc;
Drill Physical :
.......................
02-06 Filter(condition=[$3]): rowcount = 3750.0,
cumulative cost = {79500.0 rows, 568512.0 cpu, 0.0 io, 1.90464E8 network,
264000.0 memory}, id = 2649
02-07 HashJoin(condition=[=($0, $1)],
joinType=[left]): rowcount = 15000.0, cumulative cost = {64500.0 rows, 508512.0
cpu, 0.0 io, 1.90464E8 network, 264000.0 memory}, id = 2648
02-09 HashToRandomExchange(dist0=[[$0]]):
rowcount = 1500.0, cumulative cost = {3000.0 rows, 25500.0 cpu, 0.0 io,
6144000.0 network, 0.0 memory}, id = 2644
03-01 Scan(groupscan=[ParquetGroupScan
[entries=[ReadEntryWithPath [path=/tpch/customer.parquet]],
selectionRoot=/tpch/customer.parquet, columns=[SchemaPath [`c_custkey`]]]]):
rowcount = 1500.0, cumulative cost = {1500.0 rows, 1500.0 cpu, 0.0 io, 0.0
network, 0.0 memory}, id = 2643
02-08 HashToRandomExchange(dist0=[[$0]]):
rowcount = 15000.0, cumulative cost = {45000.0 rows, 285012.0 cpu, 0.0 io,
1.8432E8 network, 0.0 memory}, id = 2647
04-01 Project(o_custkey=[$1],
o_orderkey=[$0], $f4=[NOT(LIKE($2, '%special%requests%'))]): rowcount =
15000.0, cumulative cost = {30000.0 rows, 45012.0 cpu, 0.0 io, 0.0 network, 0.0
memory}, id = 2646
04-02 Scan(groupscan=[ParquetGroupScan
[entries=[ReadEntryWithPath [path=/tpch/orders.parquet]],
selectionRoot=/tpch/orders.parquet, columns=[SchemaPath [`o_custkey`],
SchemaPath [`o_orderkey`], SchemaPath [`o_comment`]]]]): rowcount = 15000.0,
cumulative cost = {15000.0 rows, 45000.0 cpu, 0.0 io, 0.0 network, 0.0 memory},
id = 2645
--
This message was sent by Atlassian JIRA
(v6.2#6252)
