zenoyang opened a new pull request, #16480:
URL: https://github.com/apache/doris/pull/16480
# Proposed changes
Issue Number: close #xxx
When the number of selected partition queried is greater than 1 and there is
a group by statement, the PartitionCache will not be hit.
Even the examples provided on the official website and `PartitionCacheTest`
UT cannot be hit, and PartitionCache is basically unavailable.
## Problem summary
Reproduce:
```sql
create table appevent (
`eventdate` date NULL,
`bu_name` varchar(50) NULL,
`client_type` varchar(50) NULL,
`userid` varchar(50) NULL
) ENGINE=OLAP
DUPLICATE KEY(`eventdate`)
PARTITION BY RANGE(`eventdate`)
(PARTITION p20230101 VALUES [('2023-01-01'), ('2023-01-02')),
PARTITION p20230102 VALUES [('2023-01-02'), ('2023-01-03')),
PARTITION p20230103 VALUES [('2023-01-03'), ('2023-01-04')),
PARTITION p20230104 VALUES [('2023-01-04'), ('2023-01-05')),
PARTITION p20230105 VALUES [('2023-01-05'), ('2023-01-06')))
DISTRIBUTED BY HASH(`bu_name`) BUCKETS 3
PROPERTIES (
"replication_allocation" = "tag.location.default: 3",
"in_memory" = "false",
"storage_format" = "V2"
)
insert into appevent values('2023-01-01', 'bu1', 'ios', 'user01');
insert into appevent values('2023-01-02', 'bu1', 'ios', 'user01');
insert into appevent values('2023-01-03', 'bu1', 'ios', 'user01');
insert into appevent values('2023-01-04', 'bu1', 'ios', 'user01');
insert into appevent values('2023-01-05', 'bu1', 'ios', 'user01');
SELECT
eventdate,count(userid)
FROM
testdb.appevent
WHERE
eventdate>="2023-01-01" AND eventdate<="2023-01-05"
GROUP BY
eventdate
ORDER BY
eventdate;
```
The following logic is triggered when querying:
```java
if (enablePartitionCache() && ((OlapScanNode)
node).getSelectedPartitionNum() > 1
&& selectStmt.hasGroupByClause()) {
LOG.debug("more than one partition scanned when qeury has agg, partition
cache cannot use, queryid {}",
DebugUtil.printId(queryId));
return CacheMode.None;
}
```
## Checklist(Required)
1. Does it affect the original behavior:
- [ ] Yes
- [ ] No
- [ ] I don't know
2. Has unit tests been added:
- [ ] Yes
- [ ] No
- [ ] No Need
3. Has document been added or modified:
- [ ] Yes
- [ ] No
- [ ] No Need
4. Does it need to update dependencies:
- [ ] Yes
- [ ] No
5. 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
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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