Gopal V created HIVE-13102:
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Summary: CBO: Reduce operations in Calcite do not fold as tight as
rule-based folding
Key: HIVE-13102
URL: https://issues.apache.org/jira/browse/HIVE-13102
Project: Hive
Issue Type: Improvement
Components: CBO
Affects Versions: 2.1.0
Reporter: Gopal V
Assignee: Jesus Camacho Rodriguez
With CBO
{code}
create temporary table table1(id int, val int, val1 int, dimid int);
create temporary table table3(id int, val int, val1 int);
hive> explain select table1.id, table1.val, table1.val1 from table1 inner join
table3 on table1.dimid = table3.id and table3.id = 1 where table1.dimid <>1 ;
Warning: Map Join MAPJOIN[14][bigTable=?] in task 'Map 1' is a cross product
OK
Plan optimized by CBO.
Vertex dependency in root stage
Map 1 <- Map 2 (BROADCAST_EDGE)
Stage-0
Fetch Operator
limit:-1
Stage-1
Map 1 llap
File Output Operator [FS_11]
Map Join Operator [MAPJOIN_14] (rows=1 width=0)
Conds:(Inner),Output:["_col0","_col1","_col2"]
<-Map 2 [BROADCAST_EDGE] llap
BROADCAST [RS_8]
Select Operator [SEL_5] (rows=1 width=0)
Filter Operator [FIL_13] (rows=1 width=0)
predicate:(id = 1)
TableScan [TS_3] (rows=1 width=0)
default@table3,table3,Tbl:PARTIAL,Col:NONE,Output:["id"]
<-Select Operator [SEL_2] (rows=1 width=0)
Output:["_col0","_col1","_col2"]
Filter Operator [FIL_12] (rows=1 width=0)
predicate:((dimid = 1) and (dimid <> 1))
TableScan [TS_0] (rows=1 width=0)
default@table1,table1,Tbl:PARTIAL,Col:NONE,Output:["id","val","val1","dimid"]
{code}
without CBO
{code}
hive> explain select table1.id, table1.val, table1.val1 from table1 inner join
table3 on table1.dimid = table3.id and table3.id = 1 where table1.dimid <>1 ;
OK
Vertex dependency in root stage
Map 1 <- Map 2 (BROADCAST_EDGE)
Stage-0
Fetch Operator
limit:-1
Stage-1
Map 1 llap
File Output Operator [FS_9]
Map Join Operator [MAPJOIN_14] (rows=1 width=0)
Conds:FIL_12.1=RS_17.1(Inner),Output:["_col0","_col1","_col2"]
<-Map 2 [BROADCAST_EDGE] vectorized, llap
BROADCAST [RS_17]
PartitionCols:1
Filter Operator [FIL_16] (rows=1 width=0)
predicate:false
TableScan [TS_1] (rows=1 width=0)
default@table3,table3,Tbl:PARTIAL,Col:COMPLETE
<-Filter Operator [FIL_12] (rows=1 width=0)
predicate:false
TableScan [TS_0] (rows=1 width=0)
default@table1,table1,Tbl:PARTIAL,Col:NONE,Output:["id","val","val1"]
Time taken: 0.044 seconds, Fetched: 23 row(s)
{code}
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