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https://issues.apache.org/jira/browse/HIVE-8616?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Suhas Satish updated HIVE-8616:
-------------------------------
Status: Patch Available (was: Open)
Attached a patch which addresses this sub-task. With this patch applied, this
is the explain plan for a 3-way join.
explain select * from table1 join table2 on (table1.key = table2.key) join
table3 on table1.key = table3.key;
OK
STAGE DEPENDENCIES:
Stage-1 is a root stage
Stage-0 depends on stages: Stage-1
STAGE PLANS:
Stage: Stage-1
Spark
Edges:
Map 1 <- Map 2 (NONE, 0), Map 3 (NONE, 0)
DagName: ssatish_20141027131919_0ab004f6-5495-44b4-b7b1-16bf8ca15473:2
Vertices:
Map 1
Map Operator Tree:
TableScan
alias: table1
Statistics: Num rows: 55 Data size: 5812 Basic stats:
COMPLETE Column stats: NONE
Filter Operator
predicate: key is not null (type: boolean)
Statistics: Num rows: 28 Data size: 2958 Basic stats:
COMPLETE Column stats: NONE
Map Join Operator
condition map:
Inner Join 0 to 1
Inner Join 0 to 2
condition expressions:
0 {key} {value}
1 {key} {value}
2 {key} {value}
keys:
0 key (type: int)
1 key (type: int)
2 key (type: int)
outputColumnNames: _col0, _col1, _col5, _col6, _col10,
_col11
input vertices:
1 Map 3
2 Map 2
Statistics: Num rows: 61 Data size: 6507 Basic stats:
COMPLETE Column stats: NONE
Select Operator
expressions: _col0 (type: int), _col1 (type: string),
_col5 (type: int), _col6 (type: string), _col10 (type: int), _col11 (type:
string)
outputColumnNames: _col0, _col1, _col2, _col3, _col4,
_col5
Statistics: Num rows: 61 Data size: 6507 Basic stats:
COMPLETE Column stats: NONE
File Output Operator
compressed: false
Statistics: Num rows: 61 Data size: 6507 Basic stats:
COMPLETE Column stats: NONE
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
Map 2
Map Operator Tree:
TableScan
alias: table3
Statistics: Num rows: 1 Data size: 140 Basic stats: COMPLETE
Column stats: NONE
Filter Operator
predicate: key is not null (type: boolean)
Statistics: Num rows: 1 Data size: 140 Basic stats:
COMPLETE Column stats: NONE
Reduce Output Operator
key expressions: key (type: int)
sort order: +
Map-reduce partition columns: key (type: int)
Statistics: Num rows: 1 Data size: 140 Basic stats:
COMPLETE Column stats: NONE
value expressions: value (type: string)
Map 3
Map Operator Tree:
TableScan
alias: table2
Statistics: Num rows: 55 Data size: 5791 Basic stats:
COMPLETE Column stats: NONE
Filter Operator
predicate: key is not null (type: boolean)
Statistics: Num rows: 28 Data size: 2948 Basic stats:
COMPLETE Column stats: NONE
Reduce Output Operator
key expressions: key (type: int)
sort order: +
Map-reduce partition columns: key (type: int)
Statistics: Num rows: 28 Data size: 2948 Basic stats:
COMPLETE Column stats: NONE
value expressions: value (type: string)
Stage: Stage-0
Fetch Operator
limit: -1
Processor Tree:
ListSink
> convert joinOp to MapJoinOp and generate MapWorks only
> ------------------------------------------------------
>
> Key: HIVE-8616
> URL: https://issues.apache.org/jira/browse/HIVE-8616
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Suhas Satish
> Assignee: Suhas Satish
> Attachments: HIVE-8616-spark.patch
>
>
> This is a sub-task of map join on spark.
> The parent jira is
> https://issues.apache.org/jira/browse/HIVE-7613
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