Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11555#issuecomment-194322107
For example, the following query
```scala
sqlContext
.range(10)
.select('id as 'key, 'id as 'value)
.write
.saveAsTable("test1")
sqlContext
.range(10)
.select('id as 'key, 'id as 'value)
.write
.saveAsTable("test2")
sql("SELECT sum(a.value) over (ORDER BY a.key), sum(b.value) over
(ORDER BY b.key) FROM test1 a JOIN test2 b ON a.key = b.key").explain(true)
```
The plan will be like
```
+- Project
[value#29L,key#28L,value#31L,key#30L,windowexpression(sum(value),
windowspecdefinition(sortorder(key)))#35L,windowexpression(sum(value),
windowspecdefinition(sortorder(key)))#36L,windowexpression(sum(value),
windowspecdefinition(sortorder(key)))#35L,windowexpression(sum(value),
windowspecdefinition(sortorder(key)))#36L]
+- Window
[value#29L,key#28L,value#31L,key#30L,windowexpression(sum(value),
windowspecdefinition(sortorder(key)))#35L],
[(sum(value#31L),mode=Complete,isDistinct=false) windowspecdefinition(key#30L
ASC, RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS
windowexpression(sum(value), windowspecdefinition(sortorder(key)))#36L],
[key#30L ASC]
+- Window [value#29L,key#28L,value#31L,key#30L],
[(sum(value#29L),mode=Complete,isDistinct=false) windowspecdefinition(key#28L
ASC, RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS
windowexpression(sum(value), windowspecdefinition(sortorder(key)))#35L],
[key#28L ASC]
+- Project [value#29L,key#28L,value#31L,key#30L]
+- Join Inner, Some((key#28L = key#30L))
:- SubqueryAlias a
: +- SubqueryAlias test1
: +- Relation[key#28L,value#29L] ParquetRelation
+- SubqueryAlias b
+- SubqueryAlias test2
+- Relation[key#30L,value#31L] ParquetRelation
```
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