// Select the maximum point.
func (n *chainnode) Max(field string) *InfluxQLNode {
i := newInfluxQLNode("max", field, n.Provides(), StreamEdge, ReduceCreater{
CreateFloatReducer: func() (influxql.FloatPointAggregator, influxql.FloatPointEmitter) {
fn := influxql.NewFloatFuncReducer(influxql.FloatMaxReduce)
return fn, fn
},
CreateIntegerReducer: func() (influxql.IntegerPointAggregator, influxql.IntegerPointEmitter) {
fn := influxql.NewIntegerFuncReducer(influxql.IntegerMaxReduce)
return fn, fn
},
})
n.linkChild(i)
return i
}
// Select the minimum point.
func (n *chainnode) Min(field string) *InfluxQLNode {
i := newInfluxQLNode("min", field, n.Provides(), StreamEdge, ReduceCreater{
CreateFloatReducer: func() (influxql.FloatPointAggregator, influxql.FloatPointEmitter) {
fn := influxql.NewFloatFuncReducer(influxql.FloatMinReduce, nil)
return fn, fn
},
CreateIntegerReducer: func() (influxql.IntegerPointAggregator, influxql.IntegerPointEmitter) {
fn := influxql.NewIntegerFuncReducer(influxql.IntegerMinReduce, nil)
return fn, fn
},
IsSimpleSelector: true,
})
n.linkChild(i)
return i
}
// Compute the sum of all values.
func (n *chainnode) Sum(field string) *InfluxQLNode {
i := newInfluxQLNode("sum", field, n.Provides(), StreamEdge, ReduceCreater{
CreateFloatReducer: func() (influxql.FloatPointAggregator, influxql.FloatPointEmitter) {
fn := influxql.NewFloatFuncReducer(influxql.FloatSumReduce, &influxql.FloatPoint{Value: 0})
return fn, fn
},
CreateIntegerReducer: func() (influxql.IntegerPointAggregator, influxql.IntegerPointEmitter) {
fn := influxql.NewIntegerFuncReducer(influxql.IntegerSumReduce, &influxql.IntegerPoint{Value: 0})
return fn, fn
},
IsEmptyOK: true,
})
n.linkChild(i)
return i
}
// Select the last point.
func (n *chainnode) Last(field string) *InfluxQLNode {
i := newInfluxQLNode("last", field, n.Provides(), StreamEdge, ReduceCreater{
CreateFloatReducer: func() (influxql.FloatPointAggregator, influxql.FloatPointEmitter) {
fn := influxql.NewFloatFuncReducer(influxql.FloatLastReduce, nil)
return fn, fn
},
CreateIntegerReducer: func() (influxql.IntegerPointAggregator, influxql.IntegerPointEmitter) {
fn := influxql.NewIntegerFuncReducer(influxql.IntegerLastReduce, nil)
return fn, fn
},
CreateStringReducer: func() (influxql.StringPointAggregator, influxql.StringPointEmitter) {
fn := influxql.NewStringFuncReducer(influxql.StringLastReduce, nil)
return fn, fn
},
CreateBooleanReducer: func() (influxql.BooleanPointAggregator, influxql.BooleanPointEmitter) {
fn := influxql.NewBooleanFuncReducer(influxql.BooleanLastReduce, nil)
return fn, fn
},
IsSimpleSelector: true,
})
n.linkChild(i)
return i
}