mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-19 07:01:02 +01:00
103 lines
2.1 KiB
Go
103 lines
2.1 KiB
Go
package logstorage
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import (
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"math"
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"slices"
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"strconv"
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"unsafe"
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)
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type statsMax struct {
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fields []string
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containsStar bool
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}
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func (sm *statsMax) String() string {
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return "max(" + fieldNamesString(sm.fields) + ")"
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}
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func (sm *statsMax) neededFields() []string {
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return sm.fields
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}
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func (sm *statsMax) newStatsProcessor() (statsProcessor, int) {
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smp := &statsMaxProcessor{
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sm: sm,
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max: nan,
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}
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return smp, int(unsafe.Sizeof(*smp))
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}
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type statsMaxProcessor struct {
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sm *statsMax
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max float64
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}
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func (smp *statsMaxProcessor) updateStatsForAllRows(br *blockResult) int {
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if smp.sm.containsStar {
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// Find the maximum value across all the columns
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for _, c := range br.getColumns() {
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f := c.getMaxValue(br)
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if f > smp.max || math.IsNaN(smp.max) {
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smp.max = f
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}
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}
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} else {
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// Find the maximum value across the requested columns
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for _, field := range smp.sm.fields {
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c := br.getColumnByName(field)
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f := c.getMaxValue(br)
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if f > smp.max || math.IsNaN(smp.max) {
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smp.max = f
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}
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}
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}
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return 0
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}
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func (smp *statsMaxProcessor) updateStatsForRow(br *blockResult, rowIdx int) int {
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if smp.sm.containsStar {
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// Find the maximum value across all the fields for the given row
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for _, c := range br.getColumns() {
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f := c.getFloatValueAtRow(rowIdx)
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if f > smp.max || math.IsNaN(smp.max) {
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smp.max = f
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}
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}
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} else {
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// Find the maximum value across the requested fields for the given row
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for _, field := range smp.sm.fields {
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c := br.getColumnByName(field)
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f := c.getFloatValueAtRow(rowIdx)
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if f > smp.max || math.IsNaN(smp.max) {
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smp.max = f
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}
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}
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}
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return 0
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}
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func (smp *statsMaxProcessor) mergeState(sfp statsProcessor) {
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src := sfp.(*statsMaxProcessor)
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if src.max > smp.max {
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smp.max = src.max
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}
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}
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func (smp *statsMaxProcessor) finalizeStats() string {
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return strconv.FormatFloat(smp.max, 'g', -1, 64)
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}
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func parseStatsMax(lex *lexer) (*statsMax, error) {
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fields, err := parseFieldNamesForStatsFunc(lex, "max")
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if err != nil {
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return nil, err
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}
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sm := &statsMax{
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fields: fields,
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containsStar: slices.Contains(fields, "*"),
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}
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return sm, nil
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}
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