/
arithmetic.go
97 lines (85 loc) · 2.74 KB
/
arithmetic.go
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// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package binary
import (
"math"
"github.com/m3db/m3/src/query/block"
"github.com/m3db/m3/src/query/executor/transform"
"github.com/m3db/m3/src/query/models"
)
const (
// PlusType adds datapoints in both series.
PlusType = "+"
// MinusType subtracts rhs from lhs.
MinusType = "-"
// MultiplyType multiplies datapoints by series.
MultiplyType = "*"
// DivType divides datapoints by series.
// Special cases are:
// X / 0 = +Inf
// -X / 0 = -Inf
// 0 / 0 = NaN
DivType = "/"
// ExpType raises lhs to the power of rhs.
// NB: to keep consistency with prometheus (and go)
// 0 ^ 0 = 1
// NaN ^ 0 = 1
ExpType = "^"
// ModType takes the modulo of lhs by rhs.
// Special cases are:
// X % 0 = NaN
// NaN % X = NaN
// X % NaN = NaN
ModType = "%"
)
var (
arithmeticFuncs = map[string]binaryFunction{
PlusType: func(x, y float64) float64 { return x + y },
MinusType: func(x, y float64) float64 { return x - y },
MultiplyType: func(x, y float64) float64 { return x * y },
DivType: func(x, y float64) float64 { return x / y },
ModType: math.Mod,
ExpType: math.Pow,
}
)
// Builds an arithmetic processing function if able. If wrong opType supplied,
// returns no function and false.
func buildArithmeticFunction(
opType string,
params NodeParams,
) (processFunc, bool) {
fn, ok := arithmeticFuncs[opType]
if !ok {
return nil, false
}
// Build the binary processing step.
return func(
queryCtx *models.QueryContext,
lhs, rhs block.Block,
controller *transform.Controller) (block.Block, error) {
return processBinary(
queryCtx,
lhs, rhs,
params,
controller,
false,
fn)
}, true
}