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With no indexes at all, a join between X and Y tables would require a full table scan of Y for each row in X. With an index on the relevant field in Y, it would require an index lookup on the join field in Y for each row in X, which contains a pointer to the row of interest in Y. This row is then looked up and the relevant value extracted. By using a covering index (one which includes all fields required to satisfy the query, with the first field being the one which is looked up in the join), then once the index has been searched, there is no need to then go to table Y because all the relevant data is already in the index. This offers a marginal performance improvement.
F-Droid Client
Client for F-Droid, the Free Software repository system for Android.
Building with Gradle
./gradlew assembleRelease
Direct download
You can download the application directly from our site or browse it in the repo.
Contributing
See our Contributing doc for information on how to report issues, translate the app into your language or help with development.
IRC
We are on #fdroid and #fdroid-dev on Freenode. We hold weekly dev meetings
on #fdroid-dev on Tuesdays at 20h UTC, which usually last half an hour.
FAQ
- Why does F-Droid require "Unknown Sources" to install apps by default?
Because a regular Android app cannot act as a package manager on its own. To do so, it would require system privileges (see below), similar to what Google Play does.
- Can I avoid enabling "Unknown Sources" by installing F-Droid as a privileged system app?
This used to be the case, but no longer is. Now the Privileged Extension is the one that should be placed in the system. It can be bundled with a ROM or installed via a zip, or alternatively F-Droid can install it as a system app using root.
License
This program is Free Software: You can use, study share and improve it at your will. Specifically you can redistribute and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Some icons are made by Picol, Icomoon or Dave Gandy from Flaticon or by Google and are licensed by Creative Commons BY 3.0.
Other icons are from the Material Design Icon set released under an Attribution 4.0 International license.