c648775b5b
This feature allows Calcite's Bindable interpreter to be bolted on top of Druid queries and table scans. I think it should be removed for a few reasons: 1. It is not recommended for production anyway, because it generates unscalable query plans (e.g. it will plan a join into two table scans and then try to do the entire join in memory on the broker). 2. It doesn't work with Druid-specific SQL functions, like TIME_FLOOR, REGEXP_EXTRACT, APPROX_COUNT_DISTINCT, etc. 3. It makes the SQL planning code needlessly complicated. With SQL coming out of experimental status soon, it's a good opportunity to remove this feature. |
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README.md
Apache Druid (incubating)
Apache Druid (incubating) is a high performance analytics data store for event-driven data.
Disclaimer: Apache Druid is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.
License
More Information
More information about Druid can be found on http://www.druid.io.
Documentation
You can find the documentation for the latest Druid release on the project website.
If you would like to contribute documentation, please do so under
/docs/content in this repository and submit a pull request.
Getting Started
You can get started with Druid with our quickstart.
Reporting Issues
If you find any bugs, please file a GitHub issue.
Community
The Druid community is in the process of migrating to Apache by way of the Apache Incubator. Eventually, as we proceed along this path, our site will move from http://druid.io/ to https://druid.apache.org/.
Community support is available on the druid-user mailing list(druid-user@googlegroups.com), which is hosted at Google Groups.
Development discussions occur on dev@druid.apache.org, which you can subscribe to by emailing dev-subscribe@druid.apache.org.
We also have a couple people hanging out on IRC in #druid-dev on
irc.freenode.net.
Building From Source
Please note that JDK 8 is required to build Druid.
For instructions on building Druid from source, see docs/content/development/build.md
Contributing
Please follow the guidelines listed here.