Github user yucai commented on the pull request:
https://github.com/apache/spark/pull/13204#issuecomment-222431501
Dear Davies,
Sometimes, it could be hard for me to recognize the boundary of whole stage
codegen,
for example, in below SMJ, there are 3 separate whole stage codegen
actually, can we read this info from the physical plan output?
```
+- Exchange hashpartitioning(sourceIP#0, 200), None
+- *TungstenAggregate(key=[sourceIP#0], ......
+- *Project [pagerank#30,sourceIP#0,adRevenue#3]
+- *SortMergeJoin [pageURL#29], [destURL#1], Inner, None
:- *Sort [pageURL#29 ASC], false, 0
: +- Exchange hashpartitioning(pageURL#29, 200), None
: +- ......
+- *Sort [destURL#1 ASC], false, 0
+- Exchange hashpartitioning(destURL#1, 200), None
+- ......
```
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