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stats_min.go
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stats_min.go
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package logstorage
import (
"math"
"slices"
"strings"
"unsafe"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
)
type statsMin struct {
fields []string
containsStar bool
}
func (sm *statsMin) String() string {
return "min(" + fieldNamesString(sm.fields) + ")"
}
func (sm *statsMin) updateNeededFields(neededFields fieldsSet) {
neededFields.addFields(sm.fields)
}
func (sm *statsMin) newStatsProcessor() (statsProcessor, int) {
smp := &statsMinProcessor{
sm: sm,
}
return smp, int(unsafe.Sizeof(*smp))
}
type statsMinProcessor struct {
sm *statsMin
min string
hasMin bool
}
func (smp *statsMinProcessor) updateStatsForAllRows(br *blockResult) int {
minLen := len(smp.min)
if smp.sm.containsStar {
// Find the minimum value across all the columns
for _, c := range br.getColumns() {
smp.updateStateForColumn(br, c)
}
} else {
// Find the minimum value across the requested columns
for _, field := range smp.sm.fields {
c := br.getColumnByName(field)
smp.updateStateForColumn(br, c)
}
}
return len(smp.min) - minLen
}
func (smp *statsMinProcessor) updateStatsForRow(br *blockResult, rowIdx int) int {
minLen := len(smp.min)
if smp.sm.containsStar {
// Find the minimum value across all the fields for the given row
for _, c := range br.getColumns() {
v := c.getValueAtRow(br, rowIdx)
smp.updateStateString(v)
}
} else {
// Find the minimum value across the requested fields for the given row
for _, field := range smp.sm.fields {
c := br.getColumnByName(field)
v := c.getValueAtRow(br, rowIdx)
smp.updateStateString(v)
}
}
return minLen - len(smp.min)
}
func (smp *statsMinProcessor) mergeState(sfp statsProcessor) {
src := sfp.(*statsMinProcessor)
if src.hasMin {
smp.updateStateString(src.min)
}
}
func (smp *statsMinProcessor) updateStateForColumn(br *blockResult, c *blockResultColumn) {
if len(br.timestamps) == 0 {
return
}
if c.isTime {
// Special case for time column
timestamps := br.timestamps
minTimestamp := timestamps[0]
for _, timestamp := range timestamps[1:] {
if timestamp < minTimestamp {
minTimestamp = timestamp
}
}
bb := bbPool.Get()
bb.B = marshalTimestampRFC3339NanoString(bb.B[:0], minTimestamp)
smp.updateStateBytes(bb.B)
bbPool.Put(bb)
return
}
if c.isConst {
// Special case for const column
v := c.valuesEncoded[0]
smp.updateStateString(v)
return
}
switch c.valueType {
case valueTypeString:
for _, v := range c.getValuesEncoded(br) {
smp.updateStateString(v)
}
case valueTypeDict:
for _, v := range c.dictValues {
smp.updateStateString(v)
}
case valueTypeUint8, valueTypeUint16, valueTypeUint32, valueTypeUint64:
bb := bbPool.Get()
bb.B = marshalUint64String(bb.B[:0], c.minValue)
smp.updateStateBytes(bb.B)
bbPool.Put(bb)
case valueTypeFloat64:
f := math.Float64frombits(c.minValue)
bb := bbPool.Get()
bb.B = marshalFloat64String(bb.B[:0], f)
smp.updateStateBytes(bb.B)
bbPool.Put(bb)
case valueTypeIPv4:
bb := bbPool.Get()
bb.B = marshalIPv4String(bb.B[:0], uint32(c.minValue))
smp.updateStateBytes(bb.B)
bbPool.Put(bb)
case valueTypeTimestampISO8601:
bb := bbPool.Get()
bb.B = marshalTimestampISO8601String(bb.B[:0], int64(c.minValue))
smp.updateStateBytes(bb.B)
bbPool.Put(bb)
default:
logger.Panicf("BUG: unknown valueType=%d", c.valueType)
}
}
func (smp *statsMinProcessor) updateStateBytes(b []byte) {
v := bytesutil.ToUnsafeString(b)
smp.updateStateString(v)
}
func (smp *statsMinProcessor) updateStateString(v string) {
if smp.hasMin && !lessString(v, smp.min) {
return
}
smp.min = strings.Clone(v)
smp.hasMin = true
}
func (smp *statsMinProcessor) finalizeStats() string {
if !smp.hasMin {
return "NaN"
}
return smp.min
}
func parseStatsMin(lex *lexer) (*statsMin, error) {
fields, err := parseFieldNamesForStatsFunc(lex, "min")
if err != nil {
return nil, err
}
sm := &statsMin{
fields: fields,
containsStar: slices.Contains(fields, "*"),
}
return sm, nil
}