Filter groupBy query results

It is essentially the equivalent of the HAVING clause in SQL.

Apache Druid supports the following types of having clauses.

Query filter HavingSpecs allow all Druid query filters to be used in the Having part of the query.

The grammar for a query filter HavingSpec is:

For example, to use a selector filter:

    "queryType": "groupBy",
    "dataSource": "sample_datasource",
    ...
    "having":
        {
            "type" : "filter",
            "filter" : {
              "type": "selector",
              "dimension" : "<dimension>",
              "value" : "<dimension_value>"
            }
        }
}

The simplest having clause is a numeric filter. Numeric filters can be used as the base filters for more complex boolean expressions of filters.

Here’s an example of a having-clause numeric filter:

{
    "queryType": "groupBy",
    "dataSource": "sample_datasource",
    ...
    "having":
        {
            "type": "greaterThan",
            "value": <numeric_value>
        }
}

Equal To

The equalTo filter will match rows with a specific aggregate value. The grammar for an equalTo filter is as follows:

This is the equivalent of HAVING <aggregate> = <value>.

Greater Than

The greaterThan filter will match rows with aggregate values greater than the given value. The grammar for a greaterThan filter is as follows:

{
    "queryType": "groupBy",
    "dataSource": "sample_datasource",
    ...
        {
            "type": "greaterThan",
            "aggregation": "<aggregate_metric>",
            "value": <numeric_value>
        }
}

Less Than

The lessThan filter will match rows with aggregate values less than the specified value. The grammar for a greaterThan filter is as follows:

{
    "queryType": "groupBy",
    "dataSource": "sample_datasource",
    ...
    "having":
        {
            "type": "lessThan",
            "aggregation": "<aggregate_metric>",
            "value": <numeric_value>
        }
}

This is the equivalent of HAVING <aggregate> < <value>.

dimSelector

The dimSelector filter will match rows with dimension values equal to the specified value. The grammar for a dimSelector filter is as follows:

AND

The grammar for an AND filter is as follows:

{
    "queryType": "groupBy",
    "dataSource": "sample_datasource",
    ...
    "having":
        {
            "type": "and",
                {
                    "type": "greaterThan",
                    "value": <numeric_value>
                },
                {
                    "type": "lessThan",
                    "aggregation": "<aggregate_metric>",
                    "value": <numeric_value>
                }
            ]
        }
}

OR

The grammar for an OR filter is as follows:

{
    "queryType": "groupBy",
    "dataSource": "sample_datasource",
    ...
    "having":
        {
            "type": "or",
            "havingSpecs": [
                {
                    "type": "greaterThan",
                    "aggregation": "<aggregate_metric>",
                    "value": <numeric_value>
                },
                {
                    "type": "equalTo",
                    "aggregation": "<aggregate_metric>",
                    "value": <numeric_value>
                }
            ]
}

NOT