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druid/extensions-contrib/moving-average-query/README.md

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Contributing Moving-Average Query to open source. (#6430) * Contributing Moving-Average Query to open source. * Fix failing code inspections. * See if explicit types will invoke the correct comparison function. * Explicitly remove support for druid.generic.useDefaultValueForNull configuration parameter. * Update styling and headers for complience. * Refresh code with latest master changes: * Remove NullDimensionSelector. * Apply changes of RequestLogger. * Apply changes of TimelineServerView. * Small checkstyle fix. * Checkstyle fixes. * Fixing rat errors; Teamcity errors. * Removing support theta sketches. Will be added back in this pr or a following once DI conflicts with datasketches are resolved. * Implements some of the review fixes. * Contributing Moving-Average Query to open source. * Fix failing code inspections. * See if explicit types will invoke the correct comparison function. * Explicitly remove support for druid.generic.useDefaultValueForNull configuration parameter. * Update styling and headers for complience. * Refresh code with latest master changes: * Remove NullDimensionSelector. * Apply changes of RequestLogger. * Apply changes of TimelineServerView. * Small checkstyle fix. * Checkstyle fixes. * Fixing rat errors; Teamcity errors. * Removing support theta sketches. Will be added back in this pr or a following once DI conflicts with datasketches are resolved. * Implements some of the review fixes. * More fixes for review. * More fixes from review. * MapBasedRow is Unmodifiable. Create new rows instead of modifying existing ones. * Remove more changes related to datasketches support. * Refactor BaseAverager startFrom field and add a comment. * fakeEvents field: Refactor initialization and add comment. * Rename parameters (tiny change). * Fix variable name typo in test (JAN_4). * Fix styling of non camelCase fields. * Fix Preconditions.checkArgument for cycleSize. * Add more documentation to RowBucketIterable and other classes. * key/value comment on in MovingAverageIterable. * Fix anonymous makeColumnValueSelector returning null. * Replace IdentityYieldingAccumolator with Yielders.each(). * * internalNext() should return null instead of throwing exception. * Remove unused variables/prarameters. * Harden MovingAverageIterableTest (Switch anyOf to exact match). * Change internalNext() from recursion to iteration; Simplify next() and hasNext(). * Remove unused imports. * Address review comments. * Rename fakeEvents to emptyEvents. * Remove redundant parameter key from computeMovingAverage. * Check yielder as well in RowBucketIterable#hasNext() * Fix javadoc.
2019-04-26 20:07:48 -04:00
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druid-moving-average-query
=============
Overview
=============
**Moving Average Query** is an extension which provides support for [Moving Average](https://en.wikipedia.org/wiki/Moving_average) and other Aggregate [Window Functions](https://en.wikibooks.org/wiki/Structured_Query_Language/Window_functions) in Druid queries.
Documentation
=============
See the druid.io website or under [Druid Github Repo](https://github.com/apache/incubator-druid/tree/master/docs/content/development/extensions-contrib/moving-average-query.md).