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Posted to dev@hive.apache.org by "Mostafa Mokhtar (JIRA)" <ji...@apache.org> on 2014/11/06 00:08:34 UTC
[jira] [Created] (HIVE-8747) Estimate number of rows for table with
0 rows overflows resulting in an in-efficient plan
Mostafa Mokhtar created HIVE-8747:
-------------------------------------
Summary: Estimate number of rows for table with 0 rows overflows resulting in an in-efficient plan
Key: HIVE-8747
URL: https://issues.apache.org/jira/browse/HIVE-8747
Project: Hive
Issue Type: Bug
Components: Physical Optimizer
Affects Versions: 0.14.0
Reporter: Mostafa Mokhtar
Assignee: Prasanth J
Priority: Critical
Fix For: 0.14.0
Query
{code}
select count(*)
from
web_sales
,date_dim
,ship_mode
where
web_sales.ws_sold_date_sk = date_dim.d_date_sk
and web_sales.ws_ship_mode_sk = ship_mode.sm_ship_mode_sk
and d_year = 2002
and sm_carrier in ('DIAMOND','AIRBORNE')
{code}
Explain
{code}
STAGE PLANS:
Stage: Stage-1
Tez
Edges:
Map 1 <- Map 4 (BROADCAST_EDGE)
Map 4 <- Map 3 (BROADCAST_EDGE)
Reducer 2 <- Map 1 (SIMPLE_EDGE)
DagName: mmokhtar_20141105180404_59e6fb65-529f-4eaa-9446-7f34d12bffac:30
Vertices:
Map 1
Map Operator Tree:
TableScan
alias: ship_mode
filterExpr: ((sm_carrier) IN ('DIAMOND', 'AIRBORNE') and sm_ship_mode_sk is not null) (type: boolean)
Statistics: Num rows: 0 Data size: 45 Basic stats: PARTIAL Column stats: COMPLETE
Filter Operator
predicate: ((sm_carrier) IN ('DIAMOND', 'AIRBORNE') and sm_ship_mode_sk is not null) (type: boolean)
Statistics: Num rows: 9223372036854775807 Data size: 9223372036854775807 Basic stats: COMPLETE Column stats: COMPLETE
Select Operator
expressions: sm_ship_mode_sk (type: int)
outputColumnNames: _col0
Statistics: Num rows: 9223372036854775807 Data size: 9223372036854775807 Basic stats: COMPLETE Column stats: COMPLETE
Map Join Operator
condition map:
Inner Join 0 to 1
condition expressions:
0
1
keys:
0 _col1 (type: int)
1 _col0 (type: int)
input vertices:
0 Map 4
Statistics: Num rows: 9223372036854775807 Data size: 0 Basic stats: PARTIAL Column stats: COMPLETE
Select Operator
Statistics: Num rows: 9223372036854775807 Data size: 0 Basic stats: PARTIAL Column stats: COMPLETE
Group By Operator
aggregations: count()
mode: hash
outputColumnNames: _col0
Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE Column stats: COMPLETE
Reduce Output Operator
sort order:
Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE Column stats: COMPLETE
value expressions: _col0 (type: bigint)
Execution mode: vectorized
Map 3
Map Operator Tree:
TableScan
alias: date_dim
filterExpr: ((d_year = 2002) and d_date_sk is not null) (type: boolean)
Statistics: Num rows: 73049 Data size: 81741831 Basic stats: COMPLETE Column stats: COMPLETE
Filter Operator
predicate: ((d_year = 2002) and d_date_sk is not null) (type: boolean)
Statistics: Num rows: 652 Data size: 5216 Basic stats: COMPLETE Column stats: COMPLETE
Select Operator
expressions: d_date_sk (type: int)
outputColumnNames: _col0
Statistics: Num rows: 652 Data size: 2608 Basic stats: COMPLETE Column stats: COMPLETE
Reduce Output Operator
key expressions: _col0 (type: int)
sort order: +
Map-reduce partition columns: _col0 (type: int)
Statistics: Num rows: 652 Data size: 2608 Basic stats: COMPLETE Column stats: COMPLETE
Execution mode: vectorized
Map 4
Map Operator Tree:
TableScan
alias: web_sales
filterExpr: (ws_sold_date_sk is not null and ws_ship_mode_sk is not null) (type: boolean)
Statistics: Num rows: 143966864 Data size: 19577477788 Basic stats: COMPLETE Column stats: COMPLETE
Filter Operator
predicate: (ws_sold_date_sk is not null and ws_ship_mode_sk is not null) (type: boolean)
Statistics: Num rows: 143948856 Data size: 1151518824 Basic stats: COMPLETE Column stats: COMPLETE
Select Operator
expressions: ws_sold_date_sk (type: int), ws_ship_mode_sk (type: int)
outputColumnNames: _col0, _col1
Statistics: Num rows: 143948856 Data size: 1151518824 Basic stats: COMPLETE Column stats: COMPLETE
Map Join Operator
condition map:
Inner Join 0 to 1
condition expressions:
0 {_col1}
1
keys:
0 _col0 (type: int)
1 _col0 (type: int)
outputColumnNames: _col1
input vertices:
1 Map 3
Statistics: Num rows: 1284818 Data size: 5139272 Basic stats: COMPLETE Column stats: COMPLETE
Reduce Output Operator
key expressions: _col1 (type: int)
sort order: +
Map-reduce partition columns: _col1 (type: int)
Statistics: Num rows: 1284818 Data size: 5139272 Basic stats: COMPLETE Column stats: COMPLETE
Execution mode: vectorized
Reducer 2
Reduce Operator Tree:
Group By Operator
aggregations: count(VALUE._col0)
mode: mergepartial
outputColumnNames: _col0
Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE Column stats: COMPLETE
Select Operator
expressions: _col0 (type: bigint)
outputColumnNames: _col0
Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE Column stats: COMPLETE
File Output Operator
compressed: false
Statistics: Num rows: 1 Data size: 8 Basic stats: COMPLETE Column stats: COMPLETE
table:
input format: org.apache.hadoop.mapred.TextInputFormat
output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
Execution mode: vectorized
Stage: Stage-0
Fetch Operator
limit: -1
Processor Tree:
ListSink
{code}
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