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[BugFix] MV rewrite may generate wrong plans if query only contains constant call operators (backport #50757) #50775

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merged 1 commit into from
Sep 6, 2024

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@mergify mergify bot commented Sep 6, 2024

Why I'm doing:

CREATE MATERIALIZED VIEW `test_mv1` (`1`, `count(DISTINCT k2)`)
DISTRIBUTED BY RANDOM
REFRESH MANUAL
PROPERTIES (
"replicated_storage" = "true",
"replication_num" = "1",
"storage_medium" = "HDD"
)
AS SELECT 1 AS `1`, count(DISTINCT `s1`.`k2`) AS `count(DISTINCT k2)`
FROM `test`.`s1`;

mysql> explain select count(1) from s1;
+-----------------------------+
| Explain String              |
+-----------------------------+
| PLAN FRAGMENT 0             |
|  OUTPUT EXPRS:4: count      |
|   PARTITION: UNPARTITIONED  |
|                             |
|   RESULT SINK               |
|                             |
|   2:EXCHANGE                |
|                             |
| PLAN FRAGMENT 1             |
|  OUTPUT EXPRS:              |
|   PARTITION: RANDOM         |
|                             |
|   STREAM DATA SINK          |
|     EXCHANGE ID: 02         |
|     UNPARTITIONED           |
|                             |
|   1:Project                 |
|   |  <slot 4> : count(5: 1) |
|   |                         |
|   0:OlapScanNode            |
|      TABLE: test_mv1        |
|      PREAGGREGATION: ON     |
|      partitions=1/1         |
|      rollup: test_mv1       |
|      tabletRatio=2/2        |
|      tabletList=30937,30939 |
|      cardinality=1          |
|      avgRowSize=8.0         |
|      MaterializedView: true |
+-----------------------------+
29 rows in set (0.00 sec)

Query will face this error:

mysql> select count(1) from s1; 

ERROR 1064 (HY000): Vectorized engine does not support the operator, node_type: 0 backend [id=10001] [host=172.26.92.227]

What I'm doing:

  • Fix mv rewrite wrong plans if query only contains constant call operators

Fixes #issue

What type of PR is this:

  • BugFix
  • Feature
  • Enhancement
  • Refactor
  • UT
  • Doc
  • Tool

Does this PR entail a change in behavior?

  • Yes, this PR will result in a change in behavior.
  • No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

  • Interface/UI changes: syntax, type conversion, expression evaluation, display information
  • Parameter changes: default values, similar parameters but with different default values
  • Policy changes: use new policy to replace old one, functionality automatically enabled
  • Feature removed
  • Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

  • I have added test cases for my bug fix or my new feature
  • This pr needs user documentation (for new or modified features or behaviors)
    • I have added documentation for my new feature or new function
  • This is a backport pr

Bugfix cherry-pick branch check:

  • I have checked the version labels which the pr will be auto-backported to the target branch
    • 3.3
    • 3.2
    • 3.1
    • 3.0
    • 2.5

This is an automatic backport of pull request #50757 done by [Mergify](https://mergify.com). ## Why I'm doing: ``` CREATE MATERIALIZED VIEW `test_mv1` (`1`, `count(DISTINCT k2)`) DISTRIBUTED BY RANDOM REFRESH MANUAL PROPERTIES ( "replicated_storage" = "true", "replication_num" = "1", "storage_medium" = "HDD" ) AS SELECT 1 AS `1`, count(DISTINCT `s1`.`k2`) AS `count(DISTINCT k2)` FROM `test`.`s1`;

mysql> explain select count(1) from s1;
+-----------------------------+
| Explain String |
+-----------------------------+
| PLAN FRAGMENT 0 |
| OUTPUT EXPRS:4: count |
| PARTITION: UNPARTITIONED |
| |
| RESULT SINK |
| |
| 2:EXCHANGE |
| |
| PLAN FRAGMENT 1 |
| OUTPUT EXPRS: |
| PARTITION: RANDOM |
| |
| STREAM DATA SINK |
| EXCHANGE ID: 02 |
| UNPARTITIONED |
| |
| 1:Project |
| | <slot 4> : count(5: 1) |
| | |
| 0:OlapScanNode |
| TABLE: test_mv1 |
| PREAGGREGATION: ON |
| partitions=1/1 |
| rollup: test_mv1 |
| tabletRatio=2/2 |
| tabletList=30937,30939 |
| cardinality=1 |
| avgRowSize=8.0 |
| MaterializedView: true |
+-----------------------------+
29 rows in set (0.00 sec)


Query will face this error:

mysql> select count(1) from s1;

ERROR 1064 (HY000): Vectorized engine does not support the operator, node_type: 0 backend [id=10001] [host=172.26.92.227]


## What I'm doing:
- Fix mv rewrite wrong plans if query only contains constant call operators 

Fixes #issue

## What type of PR is this:

- [x] BugFix
- [ ] Feature
- [ ] Enhancement
- [ ] Refactor
- [ ] UT
- [ ] Doc
- [ ] Tool

Does this PR entail a change in behavior?

- [ ] Yes, this PR will result in a change in behavior.
- [x] No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

- [ ] Interface/UI changes: syntax, type conversion, expression evaluation, display information
- [ ] Parameter changes: default values, similar parameters but with different default values
- [ ] Policy changes: use new policy to replace old one, functionality automatically enabled
- [ ] Feature removed
- [ ] Miscellaneous: upgrade & downgrade compatibility, etc.

## Checklist:

- [x] I have added test cases for my bug fix or my new feature
- [ ] This pr needs user documentation (for new or modified features or behaviors)
  - [ ] I have added documentation for my new feature or new function
- [x] This is a backport pr

…onstant call operators (#50757)

Signed-off-by: shuming.li <[email protected]>
(cherry picked from commit 215c164)
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sonarcloud bot commented Sep 6, 2024

Quality Gate Failed Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

@wanpengfei-git wanpengfei-git merged commit 0fdb7c7 into branch-3.3 Sep 6, 2024
37 of 38 checks passed
@wanpengfei-git wanpengfei-git deleted the mergify/bp/branch-3.3/pr-50757 branch September 6, 2024 07:10
xiangguangyxg pushed a commit to xiangguangyxg/starrocks that referenced this pull request Sep 6, 2024
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