Rui Li created HIVE-17020:
-----------------------------
Summary: Aggressive RS dedup can incorrectly remove OP tree branch
Key: HIVE-17020
URL: https://issues.apache.org/jira/browse/HIVE-17020
Project: Hive
Issue Type: Bug
Reporter: Rui Li
Assignee: Rui Li
Suppose we have an OP tree like this:
{noformat}
...
|
RS[1]
|
SEL[2]
/ \
SEL[3] SEL[4]
| |
RS[5] FS[6]
|
...
{noformat}
When doing aggressive RS dedup, we'll remove all the operators between RS5 and
RS1, and thus the branch containing FS6 is lost.
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