Jesus Camacho Rodriguez created HIVE-13816:
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Summary: Infer constants directly when we create semijoin
Key: HIVE-13816
URL: https://issues.apache.org/jira/browse/HIVE-13816
Project: Hive
Issue Type: Sub-task
Components: Parser
Affects Versions: 2.1.0
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
Follow-up on HIVE-13068.
When we create a left semijoin, we could infer the constants from the SEL below
when we create the GB to remove duplicates on the right hand side.
Ex. ql/src/test/results/clientpositive/constprog_semijoin.q.out
{noformat}
explain select table1.id, table1.val, table1.val1 from table1 left semi join
table3 on table1.dimid = table3.id and table3.id = 100 where table1.dimid =
100;
{noformat}
Plan:
{noformat}
STAGE DEPENDENCIES:
Stage-1 is a root stage
Stage-0 depends on stages: Stage-1
STAGE PLANS:
Stage: Stage-1
Map Reduce
Map Operator Tree:
TableScan
alias: table1
Statistics: Num rows: 10 Data size: 200 Basic stats: COMPLETE
Column stats: NONE
Filter Operator
predicate: (((dimid = 100) = true) and (dimid = 100)) (type:
boolean)
Statistics: Num rows: 2 Data size: 40 Basic stats: COMPLETE
Column stats: NONE
Select Operator
expressions: id (type: int), val (type: string), val1 (type:
string)
outputColumnNames: _col0, _col1, _col2
Statistics: Num rows: 2 Data size: 40 Basic stats: COMPLETE
Column stats: NONE
Reduce Output Operator
key expressions: 100 (type: int), true (type: boolean)
sort order: ++
Map-reduce partition columns: 100 (type: int), true (type:
boolean)
Statistics: Num rows: 2 Data size: 40 Basic stats: COMPLETE
Column stats: NONE
value expressions: _col0 (type: int), _col1 (type: string),
_col2 (type: string)
TableScan
alias: table3
Statistics: Num rows: 5 Data size: 15 Basic stats: COMPLETE Column
stats: NONE
Filter Operator
predicate: (((id = 100) = true) and (id = 100)) (type: boolean)
Statistics: Num rows: 1 Data size: 3 Basic stats: COMPLETE Column
stats: NONE
Select Operator
expressions: 100 (type: int), true (type: boolean)
outputColumnNames: _col0, _col1
Statistics: Num rows: 1 Data size: 3 Basic stats: COMPLETE
Column stats: NONE
Group By Operator
keys: _col0 (type: int), _col1 (type: boolean)
mode: hash
outputColumnNames: _col0, _col1
Statistics: Num rows: 1 Data size: 3 Basic stats: COMPLETE
Column stats: NONE
Reduce Output Operator
key expressions: _col0 (type: int), _col1 (type: boolean)
sort order: ++
Map-reduce partition columns: _col0 (type: int), _col1
(type: boolean)
Statistics: Num rows: 1 Data size: 3 Basic stats: COMPLETE
Column stats: NONE
Reduce Operator Tree:
Join Operator
condition map:
Left Semi Join 0 to 1
keys:
0 100 (type: int), true (type: boolean)
1 _col0 (type: int), _col1 (type: boolean)
outputColumnNames: _col0, _col1, _col2
Statistics: Num rows: 2 Data size: 44 Basic stats: COMPLETE Column
stats: NONE
File Output Operator
compressed: false
Statistics: Num rows: 2 Data size: 44 Basic stats: COMPLETE Column
stats: NONE
table:
input format: org.apache.hadoop.mapred.SequenceFileInputFormat
output format:
org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
Stage: Stage-0
Fetch Operator
limit: -1
Processor Tree:
ListSink
{noformat}
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