// Select the bottom `num` points for `field` and sort by any extra tags or fields.
func (n *chainnode) Bottom(num int64, field string, fieldsAndTags ...string) *InfluxQLNode {
tags := make([]int, len(fieldsAndTags))
for i := range fieldsAndTags {
tags[i] = i
}
i := newInfluxQLNode("bottom", field, n.Provides(), BatchEdge, ReduceCreater{
CreateFloatBulkReducer: func() (FloatBulkPointAggregator, influxql.FloatPointEmitter) {
fn := influxql.NewFloatSliceFuncReducer(influxql.NewFloatBottomReduceSliceFunc(
int(num),
tags,
influxql.Interval{},
))
return fn, fn
},
CreateIntegerBulkReducer: func() (IntegerBulkPointAggregator, influxql.IntegerPointEmitter) {
fn := influxql.NewIntegerSliceFuncReducer(influxql.NewIntegerBottomReduceSliceFunc(
int(num),
tags,
influxql.Interval{},
))
return fn, fn
},
TopBottomCallInfo: &TopBottomCallInfo{
FieldsAndTags: fieldsAndTags,
},
})
n.linkChild(i)
return i
}
// Produce batch of only the distinct points.
func (n *chainnode) Distinct(field string) *InfluxQLNode {
i := newInfluxQLNode("distinct", field, n.Provides(), BatchEdge, ReduceCreater{
CreateFloatBulkReducer: func() (FloatBulkPointAggregator, influxql.FloatPointEmitter) {
fn := influxql.NewFloatSliceFuncReducer(influxql.FloatDistinctReduceSlice)
return fn, fn
},
CreateIntegerBulkReducer: func() (IntegerBulkPointAggregator, influxql.IntegerPointEmitter) {
fn := influxql.NewIntegerSliceFuncReducer(influxql.IntegerDistinctReduceSlice)
return fn, fn
},
})
n.linkChild(i)
return i
}
// Select a point at the given percentile. This is a selector function, no interpolation between points is performed.
func (n *chainnode) Percentile(field string, percentile float64) *InfluxQLNode {
i := newInfluxQLNode("percentile", field, n.Provides(), StreamEdge, ReduceCreater{
CreateFloatBulkReducer: func() (FloatBulkPointAggregator, influxql.FloatPointEmitter) {
fn := influxql.NewFloatSliceFuncReducer(influxql.NewFloatPercentileReduceSliceFunc(percentile))
return fn, fn
},
CreateIntegerBulkReducer: func() (IntegerBulkPointAggregator, influxql.IntegerPointEmitter) {
fn := influxql.NewIntegerSliceFuncReducer(influxql.NewIntegerPercentileReduceSliceFunc(percentile))
return fn, fn
},
})
n.linkChild(i)
return i
}