This PR, building on top of the work introduced in #6222, extends
`druid-bloom-filters` with an aggregator, allowing bloom filters to be computed
from query results which can then be used as input to `bloom` filters in
subsequent queries.
example query:
```json
{
"queryType": "timeseries",
"dataSource": "wikiticker",
"intervals": [ "2015-09-12T00:00:00.000/2015-09-13T00:00:00.000" ],
"granularity": "day",
"aggregations": [
{
"type": "bloom",
"name": "userBloom",
"maxNumEntries": 100000,
"field": {
"type":"default",
"dimension":"user",
"outputType": "STRING"
}
}
]
}
```
example results:
```json
[{"timestamp":"2015-09-12T00:00:00.000Z","result":{"userBloom":"BAAAJhAAAA..."}}]
```
[ Full content available at:
https://github.com/apache/incubator-druid/pull/6397 ]
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