ngsg commented on code in PR #5717:
URL: https://github.com/apache/hive/pull/5717#discussion_r2071492206
##########
ql/src/test/queries/clientpositive/sharedwork_mapjoin_datasize_check.q:
##########
@@ -0,0 +1,66 @@
+--! qt:dataset:src
+--! qt:dataset:src1
+
+set hive.auto.convert.join=true;
+set hive.llap.mapjoin.memory.oversubscribe.factor=0;
+set hive.auto.convert.join.noconditionaltask.size=500;
+
+-- The InMemoryDataSize of MapJoin is 280. Therefore, SWO should not merge 2
TSs reading src
+-- as the sum of InMemoryDataSize of 2 unmerged MapJoin exceeds 500.
Review Comment:
Before the patch, `SharedWorkOptimizer` merges two TableScan operators,
which results in fewer Map vertices in the explained plan.
I also attached the Tez vertex dependency from the original qfile output for
your understanding:
```
Edges:
Map 1 <- Map 4 (BROADCAST_EDGE), Reducer 5 (BROADCAST_EDGE)
Reducer 2 <- Map 1 (SIMPLE_EDGE), Reducer 3 (BROADCAST_EDGE)
Reducer 3 <- Map 1 (SIMPLE_EDGE)
Reducer 5 <- Map 4 (SIMPLE_EDGE)
#### A masked pattern was here ####
```
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