avamingli opened a new pull request, #1606:
URL: https://github.com/apache/cloudberry/pull/1606
Add a new AQUMV code path that rewrites multi-table JOIN queries to scan
materialized views when the query exactly matches the MV definition. This
compares the saved raw parse tree against stored viewQuery from gp_matview_aux,
bypassing the single-table AQUMV logic entirely.
This enables significant query acceleration for common analytical patterns:
instead of repeatedly computing expensive multi-table joins at query time, the
planner can directly read pre-computed results from the materialized view,
turning O(N*M) join operations into a simple sequential scan.
For example, given:
```sql
CREATE MATERIALIZED VIEW mv AS
SELECT t1.a, t2.b FROM t1 JOIN t2 ON t1.a = t2.a;
-- Before (GUC off): original join plan
Gather Motion 3:1
-> Hash Join
Hash Cond: (t1.a = t2.a)
-> Seq Scan on t1
-> Hash
-> Seq Scan on t2
-- After (GUC on): rewritten to MV scan
Gather Motion 3:1
-> Seq Scan on mv
```
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Fixes #ISSUE_Number
### What does this PR do?
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### Type of Change
- [ ] Bug fix (non-breaking change)
- [ ] New feature (non-breaking change)
- [ ] Breaking change (fix or feature with breaking changes)
- [ ] Documentation update
### Breaking Changes
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### Test Plan
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- [ ] Unit tests added/updated
- [ ] Integration tests added/updated
- [ ] Passed `make installcheck`
- [ ] Passed `make -C src/test installcheck-cbdb-parallel`
### Impact
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**Performance:**
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**User-facing changes:**
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**Dependencies:**
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### Checklist
- [ ] Followed [contribution
guide](https://cloudberry.apache.org/contribute/code)
- [ ] Added/updated documentation
- [ ] Reviewed code for security implications
- [ ] Requested review from [cloudberry
committers](https://github.com/orgs/apache/teams/cloudberry-committers)
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