/
aggs_cardinality.go
36 lines (32 loc) · 1.25 KB
/
aggs_cardinality.go
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// Copyright (C) 2022 Sneller, Inc.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package elastic_proxy
type aggsCardinality struct {
fieldMetricAgg
}
func (f *aggsCardinality) transform(subBucket string, c *aggsGenerateContext) error {
c.addProjection(subBucket, &exprFunction{
Context: c.context,
Name: "COUNT",
Exprs: []expression{&exprOperator1{Context: c.context, Operator: "DISTINCT", Expr1: ParseExprFieldName(c.context, f.Field)}},
})
return nil
}
func (f *aggsCardinality) process(c *aggsProcessContext) (any, error) {
v, _ := c.result()
if v == nil {
v = 0 // use 0 as the default value
}
return &metricResult{v}, nil
}