586bec79f5
Problem recurrence
SSB single table `lineorder_flat`, the query SQL is as follows:
```sql
SELECT
sum(LO_REVENUE),
(LO_ORDERDATE DIV 10000) AS year,
P_BRAND
FROM lineorder_flat
WHERE P_BRAND >= 'MFGR#22211111' AND P_BRAND <= 'MFGR#22281111' AND S_REGION = 'ASIA' and (LO_ORDERDATE DIV 10000) = 1992
GROUP BY
year,
P_BRAND
ORDER BY
year,
P_BRAND;
```
when `enable_low_cardinality_optimize=false`, query result：
```sql
+-------------------+------+-----------+
| sum(`LO_REVENUE`) | year | P_BRAND |
+-------------------+------+-----------+
| 65423264312 | 1992 | MFGR#2222 |
| 66936772687 | 1992 | MFGR#2223 |
| 64047191934 | 1992 | MFGR#2224 |
| 65744559138 | 1992 | MFGR#2225 |
| 66993045668 | 1992 | MFGR#2226 |
| 67411226147 | 1992 | MFGR#2227 |
| 69390885970 | 1992 | MFGR#2228 |
+-------------------+------+-----------+
```
when `enable_low_cardinality_optimize=true`, query result：
```sql
+-------------------+------+-----------+
| sum(`LO_REVENUE`) | year | P_BRAND |
+-------------------+------+-----------+
| 66936772687 | 1992 | MFGR#2223 |
| 64047191934 | 1992 | MFGR#2224 |
| 65744559138 | 1992 | MFGR#2225 |
| 66993045668 | 1992 | MFGR#2226 |
| 67411226147 | 1992 | MFGR#2227 |
| 69390885970 | 1992 | MFGR#2228 |
+-------------------+------+-----------+
```
One line less than the correct result.
The reason is that 'MFGR#22211111' is not in the dictionary, so get the boundary code (`find_code_by_bound` method), but there is a bug here.
Apache Doris (incubating)
Doris is an MPP-based interactive SQL data warehousing for reporting and analysis. Its original name was Palo, developed in Baidu. After donated to Apache Software Foundation, it was renamed Doris.
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Doris provides high concurrent low latency point query performance, as well as high throughput queries of ad-hoc analysis.
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Doris provides batch data loading and real-time mini-batch data loading.
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Doris provides high availability, reliability, fault tolerance, and scalability.
The main advantages of Doris are the simplicity (of developing, deploying and using) and meeting many data serving requirements in a single system. For details, refer to Overview.
Official website: https://doris.apache.org/
License
Note
Some licenses of the third-party dependencies are not compatible with Apache 2.0 License. So you need to disable some Doris features to be complied with Apache 2.0 License. For details, refer to the
thirdparty/LICENSE.txt
Technology
Doris mainly integrates the technology of Google Mesa and Apache Impala, and it is based on a column-oriented storage engine and can communicate by MySQL client.
Compile and install
See Compilation
Getting start
See Basic Usage
Report issues or submit pull request
If you find any bugs, feel free to file a GitHub issue or fix it by submitting a pull request.
Contact Us
Contact us through the following mailing list.
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| dev@doris.apache.org | Development-related discussions | Subscribe | Unsubscribe | Archives |
Links
- Doris official site - http://doris.incubator.apache.org
- Developer Mailing list - dev@doris.apache.org. Mail to dev-subscribe@doris.apache.org, follow the reply to subscribe the mail list.
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