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Filter on metrics doc (#10087) 

* add note about filter on metrics to filter docs

* edit doc to include having and filtered aggregator links
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Surekha 2020-06-30 19:52:40 -07:00 committed by GitHub
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docs/querying/filters.md
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@ -30,6 +30,10 @@ sidebar_label: "Filters"
A filter is a JSON object indicating which rows of data should be included in the computation for a query. It’s essentially the equivalent of the WHERE clause in SQL. Apache Druid supports the following types of filters.
**Note**
Filters are commonly applied on dimensions, but can be applied on aggregated metrics, for example, see [filtered-aggregator](./aggregations.md#filtered-aggregator) and [having-filters](./having.md).
### Selector filter
The simplest filter is a selector filter. The selector filter will match a specific dimension with a specific value. Selector filters can be used as the base filters for more complex Boolean expressions of filters.