a8c444d6d5
Convert the binary predicate of the form `<CastExpr<SlotRef(ResultType=BIGINT)>> <op><DecimalLiteral>` to the binary predicate of `<SlotRef(ResultType=BIGINT)> <new op> <new DecimalLiteral>`, thereby allowing the binary predicate The predicate pushes down and completes the bucket clipped. For query `select * from T where t1 = 2.0`, when the ResultType of column t1 is equal to BIGINT, in the binary predicate analyze, the type will be unified to DECIMALV2, so the binary predicate will be converted to `<CastExpr<SlotRef>> <op In the form of ><DecimalLiteral>`, because Cast wraps the t1 column, it cannot be pushed down, resulting in poor performance.We convert it to the equivalent query `select * from T where t1 = 2` to push down and improve performance. SSB test: 1. query `select * from LINEORDER3 where LO_ORDERKEY <2.2` Performance improvement: `1.587s` -> `0.012s`, The result and performance of `select * from LINEORDER3 where LO_ORDERKEY <3` are equivalent, and the other comparison methods are the same. 2. query `select * from LINEORDER3 where LO_ORDERKEY = 2.2` Performance improvement: `0.012s` -> `0.006`.
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