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1.6 KiB
ReStructuredText
49 lines
1.6 KiB
ReStructuredText
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Druid
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=====
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Caravel works well with Druid, though currently not all
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advanced features out of Druid are covered. This page clarifies what is
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covered and what isn't and explains how to use some of the features.
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.. note ::
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Currently Airbnb runs against Druid ``0.8.x`` and previous /
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following versions are not tested against.
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Supported
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'''''''''
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Aggregations
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------------
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Common aggregations, or Druid metrics can be defined and used in Caravel.
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The first and simpler use case is to use the checkbox matrix expose in your
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datasource's edit view (``Sources -> Druid Datasources ->
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[your datasource] -> Edit -> [tab] List Druid Column``).
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Clicking the ``GroupBy`` and ``Filterable`` checkboxes will make the column
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appear in the related dropdowns while in explore view. Checking
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``Count Distinct``, ``Min``, ``Max`` or ``Sum`` will result in creating
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new metrics that will appear in the ``List Druid Metric`` tab upon saving the
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datasource. By editing these metrics, you'll notice that they their ``json``
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element correspond to Druid aggregation definition. You can create your own
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aggregations manually from the ``List Druid Metric`` tab following Druid
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documentation.
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.. image:: _static/img/druid_agg.png
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:scale: 50 %
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Post-Aggregations
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-----------------
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Druid supports post aggregation and this works in Caravel. All you have to
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do is creating a metric, much like you would create an aggregation manually,
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but specify ``postagg`` as a ``Metric Type``. You then have to provide a valid
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json post-aggregation definition (as specified in the Druid docs) in the
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Json field.
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Not yet supported
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'''''''''''''''''
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- Regex filters
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- Lookups / joins
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