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Gian Merlino 4f498e6469
SQL: Plan non-equijoin conditions as cross join followed by filter. (#14978) 
* SQL: Plan non-equijoin conditions as cross join followed by filter.

Druid has previously refused to execute joins with non-equality-based
conditions. This was well-intentioned: the idea was to push people to
write their queries in a different, hopefully more performant way.

But as we're moving towards fuller SQL support, it makes more sense to
allow these conditions to go through with the best plan we can come up
with: a cross join followed by a filter. In some cases this will allow
the query to run, and people will be happy with that. In other cases,
it will run into resource limits during execution. But we should at
least give the query a chance.

This patch also updates the documentation to explain how people can
tell whether their queries are being planned this way.

* cartesian is a word.

* Adjust tests.

* Update docs/querying/datasource.md

Co-authored-by: Benedict Jin <asdf2014@apache.org>

---------

Co-authored-by: Benedict Jin <asdf2014@apache.org>
 		2023-09-19 10:23:42 -07:00
..
script Docusaurus2 upgrade for master (#14411) 2023-08-16 19:01:21 -07:00
src Docusaurus2 upgrade for master (#14411) 2023-08-16 19:01:21 -07:00
static Docusaurus2 upgrade for master (#14411) 2023-08-16 19:01:21 -07:00
.spelling SQL: Plan non-equijoin conditions as cross join followed by filter. (#14978) 2023-09-19 10:23:42 -07:00
README.md Docusaurus2 upgrade for master (#14411) 2023-08-16 19:01:21 -07:00
docusaurus.config.js Docusaurus2 upgrade for master (#14411) 2023-08-16 19:01:21 -07:00
package-lock.json docs: update docusaurus 2 stuff (#14864) 2023-09-08 14:19:15 -07:00
package.json docs: update docusaurus 2 stuff (#14864) 2023-09-08 14:19:15 -07:00
redirects.js Docusaurus2 upgrade for master (#14411) 2023-08-16 19:01:21 -07:00
sidebars.json Query tips doc (#14922) 2023-09-05 14:16:01 -07:00

README.md

Druid doc builder

This website was created with Docusaurus.

To view documentation run:

npm install

Then run:

npm start

The current version of the web site appears in your browser. Edit pages with your favorite editor. Refresh the web page after each edit to review your changes.

Dependencies

  • NodeJS. Use the version Docusaurus specifies, not a newer one. (For example, if 12.x is requested, don't install 16.x.) Docusaurus may require a version newer than that available in your Linux package repository, but older than the latest version. See this page to find the version required by Docusaurus.
  • The Yarn dependency from Docusaurus is optional. (This Yarn is not the Hadoop resource manager, it is a package manager for Node.js).
  • Docusaurus. Installed automatically as part of the the above npm commands.

Variables

Documentation pages can refer to a number of special variables using the {{var}} syntax:

  • DRUIDVERSION - the version of Druid in which the page appears. Allows creating links to files of the same version on GitHub.

The variables are not replaced when running the web site locally using the start command above. They're replaced as part of the process that copies the docs to apache/druid-website-src/.

Spellcheck

Please run a spellcheck before issuing a pull request to avoid a build failure due to spelling issues. Run:

npm run link-lint
npm run spellcheck

If you introduce new (correctly spelled) project names or technical terms, add them to the dictionary in the .spelling file in this directory. Also, terms enclosed in backticks are not spell checked. Example: `symbolName`