mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-21 14:44:00 +00:00
931 lines
20 KiB
Go
931 lines
20 KiB
Go
package logstorage
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import (
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"fmt"
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"math"
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"strings"
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"unsafe"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/decimal"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/slicesutil"
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)
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// pipeMath processes '| math ...' pipe.
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//
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// See https://docs.victoriametrics.com/victorialogs/logsql/#math-pipe
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type pipeMath struct {
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entries []*mathEntry
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}
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type mathEntry struct {
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// The calculated expr result is stored in resultField.
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resultField string
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// expr is the expression to calculate.
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expr *mathExpr
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}
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type mathExpr struct {
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// if isConst is set, then the given mathExpr returns the given constValue.
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isConst bool
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constValue float64
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// constValueStr is the original string representation of constValue.
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//
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// It is used in String() method for returning the original representation of the given constValue.
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constValueStr string
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// if fieldName isn't empty, then the given mathExpr fetches numeric values from the given fieldName.
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fieldName string
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// args are args for the given mathExpr.
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args []*mathExpr
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// op is the operation name (aka function name) for the given mathExpr.
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op string
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// f is the function for calculating results for the given mathExpr.
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f mathFunc
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// whether the mathExpr was wrapped in parens.
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wrappedInParens bool
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}
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// mathFunc must fill result with calculated results based on the given args.
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type mathFunc func(result []float64, args [][]float64)
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func (pm *pipeMath) String() string {
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s := "math"
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a := make([]string, len(pm.entries))
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for i, e := range pm.entries {
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a[i] = e.String()
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}
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s += " " + strings.Join(a, ", ")
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return s
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}
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func (me *mathEntry) String() string {
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s := me.expr.String()
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if isMathBinaryOp(me.expr.op) {
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s = "(" + s + ")"
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}
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s += " as " + quoteTokenIfNeeded(me.resultField)
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return s
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}
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func (me *mathExpr) String() string {
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if me.isConst {
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return me.constValueStr
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}
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if me.fieldName != "" {
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return quoteTokenIfNeeded(me.fieldName)
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}
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args := me.args
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if isMathBinaryOp(me.op) {
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opPriority := getMathBinaryOpPriority(me.op)
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left := me.args[0]
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right := me.args[1]
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leftStr := left.String()
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rightStr := right.String()
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if isMathBinaryOp(left.op) && getMathBinaryOpPriority(left.op) > opPriority {
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leftStr = "(" + leftStr + ")"
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}
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if isMathBinaryOp(right.op) && getMathBinaryOpPriority(right.op) > opPriority {
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rightStr = "(" + rightStr + ")"
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}
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return fmt.Sprintf("%s %s %s", leftStr, me.op, rightStr)
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}
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if me.op == "unary_minus" {
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argStr := args[0].String()
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if isMathBinaryOp(args[0].op) {
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argStr = "(" + argStr + ")"
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}
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return "-" + argStr
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}
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a := make([]string, len(args))
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for i, arg := range args {
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a[i] = arg.String()
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}
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argsStr := strings.Join(a, ", ")
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return fmt.Sprintf("%s(%s)", me.op, argsStr)
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}
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func isMathBinaryOp(op string) bool {
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_, ok := mathBinaryOps[op]
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return ok
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}
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func getMathBinaryOpPriority(op string) int {
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bo, ok := mathBinaryOps[op]
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if !ok {
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logger.Panicf("BUG: unexpected binary op: %q", op)
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}
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return bo.priority
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}
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func getMathFuncForBinaryOp(op string) (mathFunc, error) {
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bo, ok := mathBinaryOps[op]
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if !ok {
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return nil, fmt.Errorf("unsupported binary operation: %q", op)
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}
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return bo.f, nil
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}
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var mathBinaryOps = map[string]mathBinaryOp{
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"^": {
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priority: 1,
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f: mathFuncPow,
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},
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"*": {
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priority: 2,
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f: mathFuncMul,
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},
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"/": {
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priority: 2,
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f: mathFuncDiv,
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},
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"%": {
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priority: 2,
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f: mathFuncMod,
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},
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"+": {
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priority: 3,
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f: mathFuncPlus,
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},
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"-": {
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priority: 3,
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f: mathFuncMinus,
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},
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"&": {
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priority: 4,
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f: mathFuncAnd,
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},
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"xor": {
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priority: 5,
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f: mathFuncXor,
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},
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"|": {
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priority: 6,
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f: mathFuncOr,
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},
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"default": {
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priority: 10,
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f: mathFuncDefault,
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},
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}
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type mathBinaryOp struct {
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priority int
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f mathFunc
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}
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func (pm *pipeMath) updateNeededFields(neededFields, unneededFields fieldsSet) {
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for i := len(pm.entries) - 1; i >= 0; i-- {
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e := pm.entries[i]
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if neededFields.contains("*") {
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if !unneededFields.contains(e.resultField) {
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unneededFields.add(e.resultField)
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fs := newFieldsSet()
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e.expr.updateNeededFields(fs)
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unneededFields.removeFields(fs.getAll())
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}
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} else {
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if neededFields.contains(e.resultField) {
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neededFields.remove(e.resultField)
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e.expr.updateNeededFields(neededFields)
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}
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}
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}
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}
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func (me *mathExpr) updateNeededFields(neededFields fieldsSet) {
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if me.isConst {
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return
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}
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if me.fieldName != "" {
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neededFields.add(me.fieldName)
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return
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}
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for _, arg := range me.args {
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arg.updateNeededFields(neededFields)
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}
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}
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func (pm *pipeMath) optimize() {
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// nothing to do
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}
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func (pm *pipeMath) hasFilterInWithQuery() bool {
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return false
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}
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func (pm *pipeMath) initFilterInValues(_ map[string][]string, _ getFieldValuesFunc) (pipe, error) {
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return pm, nil
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}
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func (pm *pipeMath) newPipeProcessor(workersCount int, _ <-chan struct{}, _ func(), ppNext pipeProcessor) pipeProcessor {
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pmp := &pipeMathProcessor{
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pm: pm,
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ppNext: ppNext,
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shards: make([]pipeMathProcessorShard, workersCount),
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}
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return pmp
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}
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type pipeMathProcessor struct {
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pm *pipeMath
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ppNext pipeProcessor
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shards []pipeMathProcessorShard
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}
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type pipeMathProcessorShard struct {
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pipeMathProcessorShardNopad
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// The padding prevents false sharing on widespread platforms with 128 mod (cache line size) = 0 .
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_ [128 - unsafe.Sizeof(pipeMathProcessorShardNopad{})%128]byte
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}
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type pipeMathProcessorShardNopad struct {
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// a holds all the data for rcs.
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a arena
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// rcs is used for storing calculated results before they are written to ppNext.
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rcs []resultColumn
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// rs is storage for temporary results
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rs [][]float64
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// rsBuf is backing storage for rs slices
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rsBuf []float64
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}
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func (shard *pipeMathProcessorShard) executeMathEntry(e *mathEntry, rc *resultColumn, br *blockResult) {
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clear(shard.rs)
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shard.rs = shard.rs[:0]
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shard.rsBuf = shard.rsBuf[:0]
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shard.executeExpr(e.expr, br)
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r := shard.rs[0]
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b := shard.a.b
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for _, f := range r {
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bLen := len(b)
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b = marshalFloat64String(b, f)
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v := bytesutil.ToUnsafeString(b[bLen:])
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rc.addValue(v)
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}
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shard.a.b = b
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}
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func (shard *pipeMathProcessorShard) executeExpr(me *mathExpr, br *blockResult) {
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rIdx := len(shard.rs)
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shard.rs = slicesutil.SetLength(shard.rs, len(shard.rs)+1)
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shard.rsBuf = slicesutil.SetLength(shard.rsBuf, len(shard.rsBuf)+len(br.timestamps))
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shard.rs[rIdx] = shard.rsBuf[len(shard.rsBuf)-len(br.timestamps):]
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if me.isConst {
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r := shard.rs[rIdx]
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for i := range br.timestamps {
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r[i] = me.constValue
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}
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return
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}
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if me.fieldName != "" {
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c := br.getColumnByName(me.fieldName)
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values := c.getValues(br)
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r := shard.rs[rIdx]
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var f float64
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for i, v := range values {
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if i == 0 || v != values[i-1] {
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f = parseMathNumber(v)
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}
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r[i] = f
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}
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return
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}
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rsBufLen := len(shard.rsBuf)
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for _, arg := range me.args {
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shard.executeExpr(arg, br)
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}
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result := shard.rs[rIdx]
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args := shard.rs[rIdx+1:]
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me.f(result, args)
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shard.rs = shard.rs[:rIdx+1]
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shard.rsBuf = shard.rsBuf[:rsBufLen]
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}
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func (pmp *pipeMathProcessor) writeBlock(workerID uint, br *blockResult) {
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if len(br.timestamps) == 0 {
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return
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}
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shard := &pmp.shards[workerID]
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entries := pmp.pm.entries
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shard.rcs = slicesutil.SetLength(shard.rcs, len(entries))
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rcs := shard.rcs
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for i, e := range entries {
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rc := &rcs[i]
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rc.name = e.resultField
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shard.executeMathEntry(e, rc, br)
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br.addResultColumn(rc)
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}
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pmp.ppNext.writeBlock(workerID, br)
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for i := range rcs {
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rcs[i].resetValues()
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}
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shard.a.reset()
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}
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func (pmp *pipeMathProcessor) flush() error {
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return nil
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}
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func parsePipeMath(lex *lexer) (*pipeMath, error) {
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if !lex.isKeyword("math", "eval") {
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return nil, fmt.Errorf("unexpected token: %q; want 'math' or 'eval'", lex.token)
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}
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lex.nextToken()
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var mes []*mathEntry
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for {
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me, err := parseMathEntry(lex)
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if err != nil {
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return nil, err
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}
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mes = append(mes, me)
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switch {
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case lex.isKeyword(","):
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lex.nextToken()
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case lex.isKeyword("|", ")", ""):
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if len(mes) == 0 {
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return nil, fmt.Errorf("missing 'math' expressions")
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}
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pm := &pipeMath{
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entries: mes,
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}
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return pm, nil
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default:
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return nil, fmt.Errorf("unexpected token after 'math' expression [%s]: %q; expecting ',', '|' or ')'", mes[len(mes)-1], lex.token)
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}
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}
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}
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func parseMathEntry(lex *lexer) (*mathEntry, error) {
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me, err := parseMathExpr(lex)
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if err != nil {
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return nil, err
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}
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resultField := ""
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if lex.isKeyword(",", "|", ")", "") {
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resultField = me.String()
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} else {
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if lex.isKeyword("as") {
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// skip optional 'as'
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lex.nextToken()
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}
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fieldName, err := parseFieldName(lex)
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if err != nil {
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return nil, fmt.Errorf("cannot parse result name for [%s]: %w", me, err)
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}
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resultField = fieldName
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}
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e := &mathEntry{
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resultField: resultField,
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expr: me,
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}
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return e, nil
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}
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func parseMathExpr(lex *lexer) (*mathExpr, error) {
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// parse left operand
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left, err := parseMathExprOperand(lex)
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if err != nil {
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return nil, err
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}
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for {
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if !isMathBinaryOp(lex.token) {
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// There is no right operand
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return left, nil
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}
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// parse operator
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op := lex.token
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lex.nextToken()
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f, err := getMathFuncForBinaryOp(op)
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if err != nil {
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return nil, fmt.Errorf("cannot parse operator after [%s]: %w", left, err)
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}
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// parse right operand
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right, err := parseMathExprOperand(lex)
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if err != nil {
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return nil, fmt.Errorf("cannot parse operand after [%s %s]: %w", left, op, err)
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}
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me := &mathExpr{
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args: []*mathExpr{left, right},
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op: op,
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f: f,
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}
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// balance operands according to their priority
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if !left.wrappedInParens && isMathBinaryOp(left.op) && getMathBinaryOpPriority(left.op) > getMathBinaryOpPriority(op) {
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me.args[0] = left.args[1]
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left.args[1] = me
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me = left
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}
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left = me
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}
|
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}
|
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|
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func parseMathExprInParens(lex *lexer) (*mathExpr, error) {
|
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if !lex.isKeyword("(") {
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return nil, fmt.Errorf("missing '('")
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}
|
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lex.nextToken()
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|
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me, err := parseMathExpr(lex)
|
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if err != nil {
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return nil, err
|
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}
|
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me.wrappedInParens = true
|
|
|
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if !lex.isKeyword(")") {
|
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return nil, fmt.Errorf("missing ')'; got %q instead", lex.token)
|
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}
|
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lex.nextToken()
|
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return me, nil
|
|
}
|
|
|
|
func parseMathExprOperand(lex *lexer) (*mathExpr, error) {
|
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if lex.isKeyword("(") {
|
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return parseMathExprInParens(lex)
|
|
}
|
|
|
|
switch {
|
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case lex.isKeyword("abs"):
|
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return parseMathExprAbs(lex)
|
|
case lex.isKeyword("exp"):
|
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return parseMathExprExp(lex)
|
|
case lex.isKeyword("ln"):
|
|
return parseMathExprLn(lex)
|
|
case lex.isKeyword("max"):
|
|
return parseMathExprMax(lex)
|
|
case lex.isKeyword("min"):
|
|
return parseMathExprMin(lex)
|
|
case lex.isKeyword("round"):
|
|
return parseMathExprRound(lex)
|
|
case lex.isKeyword("ceil"):
|
|
return parseMathExprCeil(lex)
|
|
case lex.isKeyword("floor"):
|
|
return parseMathExprFloor(lex)
|
|
case lex.isKeyword("-"):
|
|
return parseMathExprUnaryMinus(lex)
|
|
case lex.isKeyword("+"):
|
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// just skip unary plus
|
|
lex.nextToken()
|
|
return parseMathExprOperand(lex)
|
|
case isNumberPrefix(lex.token):
|
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return parseMathExprConstNumber(lex)
|
|
default:
|
|
return parseMathExprFieldName(lex)
|
|
}
|
|
}
|
|
|
|
func parseMathExprAbs(lex *lexer) (*mathExpr, error) {
|
|
me, err := parseMathExprGenericFunc(lex, "abs", mathFuncAbs)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(me.args) != 1 {
|
|
return nil, fmt.Errorf("'abs' function accepts only one arg; got %d args: [%s]", len(me.args), me)
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathExprExp(lex *lexer) (*mathExpr, error) {
|
|
me, err := parseMathExprGenericFunc(lex, "exp", mathFuncExp)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(me.args) != 1 {
|
|
return nil, fmt.Errorf("'exp' function accepts only one arg; got %d args: [%s]", len(me.args), me)
|
|
}
|
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return me, nil
|
|
}
|
|
|
|
func parseMathExprLn(lex *lexer) (*mathExpr, error) {
|
|
me, err := parseMathExprGenericFunc(lex, "ln", mathFuncLn)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
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if len(me.args) != 1 {
|
|
return nil, fmt.Errorf("'ln' function accepts only one arg; got %d args: [%s]", len(me.args), me)
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathExprMax(lex *lexer) (*mathExpr, error) {
|
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me, err := parseMathExprGenericFunc(lex, "max", mathFuncMax)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(me.args) < 2 {
|
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return nil, fmt.Errorf("'max' function needs at least 2 args; got %d args: [%s]", len(me.args), me)
|
|
}
|
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return me, nil
|
|
}
|
|
|
|
func parseMathExprMin(lex *lexer) (*mathExpr, error) {
|
|
me, err := parseMathExprGenericFunc(lex, "min", mathFuncMin)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(me.args) < 2 {
|
|
return nil, fmt.Errorf("'min' function needs at least 2 args; got %d args: [%s]", len(me.args), me)
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathExprRound(lex *lexer) (*mathExpr, error) {
|
|
me, err := parseMathExprGenericFunc(lex, "round", mathFuncRound)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(me.args) != 1 && len(me.args) != 2 {
|
|
return nil, fmt.Errorf("'round' function needs 1 or 2 args; got %d args: [%s]", len(me.args), me)
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathExprCeil(lex *lexer) (*mathExpr, error) {
|
|
me, err := parseMathExprGenericFunc(lex, "ceil", mathFuncCeil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(me.args) != 1 {
|
|
return nil, fmt.Errorf("'ceil' function needs one arg; got %d args: [%s]", len(me.args), me)
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathExprFloor(lex *lexer) (*mathExpr, error) {
|
|
me, err := parseMathExprGenericFunc(lex, "floor", mathFuncFloor)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(me.args) != 1 {
|
|
return nil, fmt.Errorf("'floor' function needs one arg; got %d args: [%s]", len(me.args), me)
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathExprGenericFunc(lex *lexer, funcName string, f mathFunc) (*mathExpr, error) {
|
|
if !lex.isKeyword(funcName) {
|
|
return nil, fmt.Errorf("missing %q keyword", funcName)
|
|
}
|
|
lex.nextToken()
|
|
|
|
args, err := parseMathFuncArgs(lex)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot parse args for %q function: %w", funcName, err)
|
|
}
|
|
if len(args) == 0 {
|
|
return nil, fmt.Errorf("%q function needs at least one org", funcName)
|
|
}
|
|
me := &mathExpr{
|
|
args: args,
|
|
op: funcName,
|
|
f: f,
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathFuncArgs(lex *lexer) ([]*mathExpr, error) {
|
|
if !lex.isKeyword("(") {
|
|
return nil, fmt.Errorf("missing '('")
|
|
}
|
|
lex.nextToken()
|
|
|
|
var args []*mathExpr
|
|
for {
|
|
if lex.isKeyword(")") {
|
|
lex.nextToken()
|
|
return args, nil
|
|
}
|
|
|
|
me, err := parseMathExpr(lex)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
args = append(args, me)
|
|
|
|
switch {
|
|
case lex.isKeyword(")"):
|
|
case lex.isKeyword(","):
|
|
lex.nextToken()
|
|
default:
|
|
return nil, fmt.Errorf("unexpected token after [%s]: %q; want ',' or ')'", me, lex.token)
|
|
}
|
|
}
|
|
}
|
|
|
|
func parseMathExprUnaryMinus(lex *lexer) (*mathExpr, error) {
|
|
if !lex.isKeyword("-") {
|
|
return nil, fmt.Errorf("missing '-'")
|
|
}
|
|
lex.nextToken()
|
|
|
|
expr, err := parseMathExprOperand(lex)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
me := &mathExpr{
|
|
args: []*mathExpr{expr},
|
|
op: "unary_minus",
|
|
f: mathFuncUnaryMinus,
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathExprConstNumber(lex *lexer) (*mathExpr, error) {
|
|
if !isNumberPrefix(lex.token) {
|
|
return nil, fmt.Errorf("cannot parse number from %q", lex.token)
|
|
}
|
|
numStr, err := getCompoundMathToken(lex)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot parse number: %w", err)
|
|
}
|
|
f := parseMathNumber(numStr)
|
|
if math.IsNaN(f) {
|
|
return nil, fmt.Errorf("cannot parse number from %q", numStr)
|
|
}
|
|
me := &mathExpr{
|
|
isConst: true,
|
|
constValue: f,
|
|
constValueStr: numStr,
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func parseMathExprFieldName(lex *lexer) (*mathExpr, error) {
|
|
fieldName, err := getCompoundMathToken(lex)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
fieldName = getCanonicalColumnName(fieldName)
|
|
me := &mathExpr{
|
|
fieldName: fieldName,
|
|
}
|
|
return me, nil
|
|
}
|
|
|
|
func getCompoundMathToken(lex *lexer) (string, error) {
|
|
stopTokens := []string{"=", "+", "-", "*", "/", "%", "^", ",", ")", "|", "!", ""}
|
|
if lex.isKeyword(stopTokens...) {
|
|
return "", fmt.Errorf("compound token cannot start with '%s'", lex.token)
|
|
}
|
|
|
|
s := lex.token
|
|
rawS := lex.rawToken
|
|
lex.nextToken()
|
|
suffix := ""
|
|
for !lex.isSkippedSpace && !lex.isKeyword(stopTokens...) {
|
|
s += lex.token
|
|
lex.nextToken()
|
|
}
|
|
if suffix == "" {
|
|
return s, nil
|
|
}
|
|
return rawS + suffix, nil
|
|
}
|
|
|
|
func mathFuncAnd(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
if math.IsNaN(a[i]) || math.IsNaN(b[i]) {
|
|
result[i] = nan
|
|
} else {
|
|
result[i] = float64(uint64(a[i]) & uint64(b[i]))
|
|
}
|
|
}
|
|
}
|
|
|
|
func mathFuncOr(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
if math.IsNaN(a[i]) || math.IsNaN(b[i]) {
|
|
result[i] = nan
|
|
} else {
|
|
result[i] = float64(uint64(a[i]) | uint64(b[i]))
|
|
}
|
|
}
|
|
}
|
|
|
|
func mathFuncXor(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
if math.IsNaN(a[i]) || math.IsNaN(b[i]) {
|
|
result[i] = nan
|
|
} else {
|
|
result[i] = float64(uint64(a[i]) ^ uint64(b[i]))
|
|
}
|
|
}
|
|
}
|
|
|
|
func mathFuncPlus(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
result[i] = a[i] + b[i]
|
|
}
|
|
}
|
|
|
|
func mathFuncMinus(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
result[i] = a[i] - b[i]
|
|
}
|
|
}
|
|
|
|
func mathFuncMul(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
result[i] = a[i] * b[i]
|
|
}
|
|
}
|
|
|
|
func mathFuncDiv(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
result[i] = a[i] / b[i]
|
|
}
|
|
}
|
|
|
|
func mathFuncMod(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
result[i] = math.Mod(a[i], b[i])
|
|
}
|
|
}
|
|
|
|
func mathFuncPow(result []float64, args [][]float64) {
|
|
a := args[0]
|
|
b := args[1]
|
|
for i := range result {
|
|
result[i] = math.Pow(a[i], b[i])
|
|
}
|
|
}
|
|
|
|
func mathFuncDefault(result []float64, args [][]float64) {
|
|
values := args[0]
|
|
defaultValues := args[1]
|
|
for i := range result {
|
|
f := values[i]
|
|
if math.IsNaN(f) {
|
|
f = defaultValues[i]
|
|
}
|
|
result[i] = f
|
|
}
|
|
}
|
|
|
|
func mathFuncAbs(result []float64, args [][]float64) {
|
|
arg := args[0]
|
|
for i := range result {
|
|
result[i] = math.Abs(arg[i])
|
|
}
|
|
}
|
|
|
|
func mathFuncExp(result []float64, args [][]float64) {
|
|
arg := args[0]
|
|
for i := range result {
|
|
result[i] = math.Exp(arg[i])
|
|
}
|
|
}
|
|
|
|
func mathFuncLn(result []float64, args [][]float64) {
|
|
arg := args[0]
|
|
for i := range result {
|
|
result[i] = math.Log(arg[i])
|
|
}
|
|
}
|
|
|
|
func mathFuncUnaryMinus(result []float64, args [][]float64) {
|
|
arg := args[0]
|
|
for i := range result {
|
|
result[i] = -arg[i]
|
|
}
|
|
}
|
|
|
|
func mathFuncMax(result []float64, args [][]float64) {
|
|
for i := range result {
|
|
f := nan
|
|
for _, arg := range args {
|
|
if math.IsNaN(f) || arg[i] > f {
|
|
f = arg[i]
|
|
}
|
|
}
|
|
result[i] = f
|
|
}
|
|
}
|
|
|
|
func mathFuncMin(result []float64, args [][]float64) {
|
|
for i := range result {
|
|
f := nan
|
|
for _, arg := range args {
|
|
if math.IsNaN(f) || arg[i] < f {
|
|
f = arg[i]
|
|
}
|
|
}
|
|
result[i] = f
|
|
}
|
|
}
|
|
|
|
func mathFuncCeil(result []float64, args [][]float64) {
|
|
arg := args[0]
|
|
for i := range result {
|
|
result[i] = math.Ceil(arg[i])
|
|
}
|
|
}
|
|
|
|
func mathFuncFloor(result []float64, args [][]float64) {
|
|
arg := args[0]
|
|
for i := range result {
|
|
result[i] = math.Floor(arg[i])
|
|
}
|
|
}
|
|
|
|
func mathFuncRound(result []float64, args [][]float64) {
|
|
arg := args[0]
|
|
if len(args) == 1 {
|
|
// Round to integer
|
|
for i := range result {
|
|
result[i] = math.Round(arg[i])
|
|
}
|
|
return
|
|
}
|
|
|
|
// Round to nearest
|
|
nearest := args[1]
|
|
var f float64
|
|
for i := range result {
|
|
if i == 0 || arg[i-1] != arg[i] || nearest[i-1] != nearest[i] {
|
|
f = round(arg[i], nearest[i])
|
|
}
|
|
result[i] = f
|
|
}
|
|
}
|
|
|
|
func round(f, nearest float64) float64 {
|
|
_, e := decimal.FromFloat(nearest)
|
|
p10 := math.Pow10(int(-e))
|
|
f += 0.5 * math.Copysign(nearest, f)
|
|
f -= math.Mod(f, nearest)
|
|
f, _ = math.Modf(f * p10)
|
|
return f / p10
|
|
}
|
|
|
|
func parseMathNumber(s string) float64 {
|
|
f, ok := tryParseNumber(s)
|
|
if ok {
|
|
return f
|
|
}
|
|
nsecs, ok := tryParseTimestampRFC3339Nano(s)
|
|
if ok {
|
|
return float64(nsecs)
|
|
}
|
|
ipNum, ok := tryParseIPv4(s)
|
|
if ok {
|
|
return float64(ipNum)
|
|
}
|
|
return nan
|
|
}
|