seawinde opened a new pull request, #43991:
URL: https://github.com/apache/doris/pull/43991
### What problem does this PR solve?
Such query as following:
```sql SELECT
s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM
part,
supplier,
partsupp,
nation,
region
WHERE
p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = 'EUROPE';
```
If query can be rewritten by materialized view as following:
```sql SELECT
s_acctbal,
s_name,
n_name,
p_partkey,
p_mfgr,
s_address,
s_phone,
s_comment
FROM
mv,
region
WHERE
p_partkey = ps_partkey
AND s_suppkey = ps_suppkey
AND p_size = 15
AND p_type LIKE '%BRASS'
AND s_nationkey = n_nationkey
AND n_regionkey = r_regionkey
AND r_name = 'EUROPE';
```
The cost of mv scan factor should be lower, because the rewrite has obvious
benefit.
Related PR: #xxx
Problem Summary:
Fix materialized view not chosen by cbo when join is rewritten by
materialized view
### Release note
Fix materialized view not chosen by cbo when join is rewritten by
materialized view
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [x] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [x] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [x] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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