avamingli opened a new pull request, #1110:
URL: https://github.com/apache/cloudberry/pull/1110
We already have the ability to use materialized views instead of origin
table in the SQL like:
INSERT INTO target table SELECT FROM origin table.
```sql
set local enable_answer_query_using_materialized_views = off;
explain(costs off, verbose) insert into t_insert select count(a) from
t_select;
QUERY PLAN
-----------------------------------------------------------------------------------
Insert on aqumv.t_insert
-> Redistribute Motion 1:3 (slice1; segments: 1)
Output: (("*SELECT*".count)::integer)
Hash Key: (("*SELECT*".count)::integer)
-> Subquery Scan on "*SELECT*"
Output: "*SELECT*".count
-> Finalize Aggregate
Output: count(t_select.a)
-> Gather Motion 3:1 (slice2; segments: 3)
Output: (PARTIAL count(t_select.a))
-> Partial Aggregate
Output: PARTIAL count(t_select.a)
-> Seq Scan on aqumv.t_select
Output: t_select.a
Settings: enable_answer_query_using_materialized_views = 'off', optimizer =
'off'
Optimizer: Postgres query optimizer
(16 rows)
```
When valid materialized view candidates exist, the system will automatically
use them for the SELECT portion of the query, eliminating the need to access
and recompute data from the original tables, providing significant performance
benefits for queries involving large datasets or frequent INSERT-SELECT
operations by leveraging pre-computed results from materialized views rather
than processing raw data each time.
```sql
set local enable_answer_query_using_materialized_views = on;
explain(costs off, verbose) insert into t_insert select count(a) from
t_select;
QUERY PLAN
----------------------------------------------------------------------------------
Insert on aqumv.t_insert
-> Redistribute Motion 3:3 (slice1; segments: 3)
Output: (("*SELECT*".count)::integer)
Hash Key: (("*SELECT*".count)::integer)
-> Subquery Scan on "*SELECT*"
Output: "*SELECT*".count
-> Seq Scan on aqumv.mv_insert_select
Output: mv_insert_select.count
Settings: enable_answer_query_using_materialized_views = 'on', optimizer =
'off'
Optimizer: Postgres query optimizer
(10 rows)
```
Authored-by: Zhang Mingli <[email protected]>
<!-- Thank you for your contribution to Apache Cloudberry (Incubating)! -->
Fixes #ISSUE_Number
### What does this PR do?
<!-- Brief overview of the changes, including any major features or fixes -->
### 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:**
<!-- Any performance implications? -->
**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)
### Additional Context
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