englefly opened a new pull request, #12894:
URL: https://github.com/apache/doris/pull/12894
# Proposed changes
TPCH q7, we have expression like
``` (n1.n_name = 'FRANCE' and n2.n_name = 'GERMANY')
or (n1.n_name = 'GERMANY' and n2.n_name = 'FRANCE')```
this expression implies
`(n1.n_name='FRANCE' or n1.n_name=''GERMANY)`
The implied expression is logical redundancy, but it could be used to reduce
the output tuple number of scan(n1), if nereids push down this expression down.
This pr introduces a RULE to extract such expressions.
NOTE:
1. we only extract expression on a single table.
2. if the extracted expression cannot be pushed down, e.g. it is on right
table of left outer join, we need another rule to remove all the useless
expressions.
Issue Number: close #xxx
## Problem summary
Describe your changes.
## Checklist(Required)
1. Does it affect the original behavior:
- [ ] Yes
- [ ] No
- [ ] I don't know
4. Has unit tests been added:
- [ ] Yes
- [ ] No
- [ ] No Need
5. Has document been added or modified:
- [ ] Yes
- [ ] No
- [ ] No Need
6. Does it need to update dependencies:
- [ ] Yes
- [ ] No
7. Are there any changes that cannot be rolled back:
- [ ] Yes (If Yes, please explain WHY)
- [ ] No
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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