c873c8c162
This PR mainly prohibits operations such as aggregation/sorting/window functions on lateral views containing subqueries. For example: select min(e1) from (select c1 from table group by c1)tmp1 lateral view explode_split(c1, ",") tmp2 as e1 But the query can be written in another way, and the result is the same. select min(e1) from (select e1 from (select c1 from table group by c1)tmp1 lateral view explode_split(c1, ",") tmp2 as e1) tmp3 The reason is that when the results of a inline view are subjected to a lateral view, and the outer query performs aggregation or sorting operations on non-table-function columns. The output slot id of the table function node is empty or has fewer columns. The essential reason is that when the inner layer contains an inline view, the outer expression needs to be mapped to the correct tuple through the substitute method according to the smap instead of the virtual tuple. But the substitute method of slot ref cannot recurse to its own source exprs. E.g SlotRef: c2 <source expr min(c1)> from agg tuple smap: <c1, c3> before: c2 <source expr min(c1)> after: c2 <source expr min(c1)> no changed
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 thethirdparty/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 for details.
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.
| Name | Scope | |||
|---|---|---|---|---|
| dev@doris.apache.org | Development-related discussions | Subscribe | Unsubscribe | Archives |
Links
- Doris official site - http://doris.incubator.apache.org
- User Manual (GitHub Wiki) - https://github.com/apache/incubator-doris/wiki
- Developer Mailing list - dev@doris.apache.org. Mail to dev-subscribe@doris.apache.org, follow the reply to subscribe the mail list.
- Gitter channel - https://gitter.im/apache-doris/Lobby - Online chat room with Doris developers.
- Overview - https://github.com/apache/incubator-doris/wiki/Doris-Overview
- Compile and install - https://github.com/apache/incubator-doris/wiki/Doris-Install
- Getting start - https://github.com/apache/incubator-doris/wiki/Getting-start
- Deploy and Upgrade - https://github.com/apache/incubator-doris/wiki/Doris-Deploy-%26-Upgrade
- User Manual - https://github.com/apache/incubator-doris/wiki/Doris-Create%2C-Load-and-Delete
- FAQs - https://github.com/apache/incubator-doris/wiki/Doris-FAQ