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aggregate_plan.go
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aggregate_plan.go
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package kvql
import (
"fmt"
"strings"
)
var (
defaultAggrKey = "*"
)
type AggrPlanField struct {
ID int
Name string
IsKey bool
Expr Expression
FuncExprs []*FunctionCallExpr
Funcs []AggrFunction
Value Column
}
type AggregatePlan struct {
Storage Storage
ChildPlan Plan
FieldNames []string
FieldTypes []Type
Fields []Expression
GroupByFields []GroupByField
AggrAll bool
Limit int
Start int
aggrFields []*AggrPlanField
aggrKeyFields []Expression
aggrMap map[string][]*AggrPlanField
aggrRows [][]*AggrPlanField
prepared bool
pos int
skips int
current int
}
func (a *AggregatePlan) listAggrFuncs(expr Expression) ([]*FunctionCallExpr, []string) {
var (
retExprs []*FunctionCallExpr
retNames []string
)
switch e := expr.(type) {
case *BinaryOpExpr:
if fcexpr, names := a.listAggrFuncs(e.Left); len(fcexpr) > 0 {
retExprs = append(retExprs, fcexpr...)
retNames = append(retNames, names...)
}
if fcexpr, names := a.listAggrFuncs(e.Right); len(fcexpr) > 0 {
retExprs = append(retExprs, fcexpr...)
retNames = append(retNames, names...)
}
case *FunctionCallExpr:
fname, err := GetFuncNameFromExpr(expr)
if err == nil && IsAggrFunc(fname) {
retExprs = append(retExprs, e)
retNames = append(retNames, fname)
}
}
return retExprs, retNames
}
func (a *AggregatePlan) listAggrFunctions(expr Expression) ([]*FunctionCallExpr, []AggrFunction, bool, error) {
fcexprs, fnames := a.listAggrFuncs(expr)
if len(fnames) == 0 {
return nil, nil, false, nil
}
var functors []AggrFunction
for i, fname := range fnames {
functor, have := GetAggrFunctionByName(fname)
if !have {
return nil, nil, false, NewExecuteError(fcexprs[i].GetPos(), "Cannot find aggregate function: %s", fname)
}
if !functor.VarArgs && functor.NumArgs != len(fcexprs[i].Args) {
return nil, nil, false, NewExecuteError(fcexprs[i].GetPos(), "Function %s require %d arguments but got %d", functor.Name, functor.NumArgs, len(fcexprs[i].Args))
}
fbody, err := functor.Body(fcexprs[i].Args)
if err != nil {
return nil, nil, false, err
}
functors = append(functors, fbody)
}
return fcexprs, functors, true, nil
}
func (a *AggregatePlan) Init() error {
a.aggrMap = make(map[string][]*AggrPlanField)
a.aggrRows = make([][]*AggrPlanField, 0, 10)
a.aggrKeyFields = make([]Expression, 0, 10)
a.aggrFields = make([]*AggrPlanField, 0, 10)
for i, f := range a.Fields {
var (
aggrFuncs []AggrFunction = nil
err error = nil
name string = a.FieldNames[i]
found bool = false
isKey bool = true
fexprs []*FunctionCallExpr
)
switch e := f.(type) {
case *FunctionCallExpr, *BinaryOpExpr:
isKey = false
fexprs, aggrFuncs, found, err = a.listAggrFunctions(e)
if err != nil {
return err
}
isKey = !found
default:
isKey = true
a.aggrKeyFields = append(a.aggrKeyFields, f)
}
a.aggrFields = append(a.aggrFields, &AggrPlanField{
ID: i,
Name: name,
IsKey: isKey,
Expr: f,
Funcs: aggrFuncs,
FuncExprs: fexprs,
})
}
a.pos = 0
a.skips = 0
a.current = 0
return a.ChildPlan.Init()
}
func (a *AggregatePlan) FieldNameList() []string {
return a.FieldNames
}
func (a *AggregatePlan) FieldTypeList() []Type {
return a.FieldTypes
}
func (a *AggregatePlan) String() string {
fields := []string{}
for _, f := range a.Fields {
fields = append(fields, f.String())
}
groups := make([]string, 0, 1)
if a.AggrAll {
groups = append(groups, "*")
} else {
for _, f := range a.GroupByFields {
groups = append(groups, f.Name)
}
}
if a.Limit < 0 {
return fmt.Sprintf("AggregatePlan{Fields = <%s>, GroupBy = <%s>}",
strings.Join(fields, ", "),
strings.Join(groups, ", "))
}
return fmt.Sprintf("AggregatePlan{Fields = <%s>, GroupBy = <%s>, Start = %d, Count = %d}",
strings.Join(fields, ", "),
strings.Join(groups, ", "),
a.Start, a.Limit)
}
func (a *AggregatePlan) Explain() []string {
ret := []string{a.String()}
for _, plan := range a.ChildPlan.Explain() {
ret = append(ret, plan)
}
return ret
}
func (a *AggregatePlan) prepare(ctx *ExecuteCtx) error {
for {
k, v, err := a.ChildPlan.Next(nil)
if err != nil {
return err
}
if k == nil && v == nil && err == nil {
break
}
aggrKey, err := a.getAggrKey(k, v, ctx)
if err != nil {
return err
}
kvp := NewKVP(k, v)
row, have := a.aggrMap[aggrKey]
if !have {
row, err = a.createAggrRow(kvp, ctx)
if err != nil {
return err
}
a.aggrMap[aggrKey] = row
a.aggrRows = append(a.aggrRows, row)
}
err = a.updateRowAggrFunc(row, kvp, ctx)
if err != nil {
return err
}
}
a.prepared = true
return nil
}
func (a *AggregatePlan) prepareBatch(ctx *ExecuteCtx) error {
for {
kvps, err := a.ChildPlan.Batch(ctx)
if err != nil {
return err
}
if len(kvps) == 0 {
break
}
aggrKeys, err := a.batchGetAggrKeys(kvps, ctx)
if err != nil {
return err
}
for i, aggrKey := range aggrKeys {
row, have := a.aggrMap[aggrKey]
if !have {
row, err = a.createAggrRow(kvps[i], ctx)
if err != nil {
return err
}
a.aggrMap[aggrKey] = row
a.aggrRows = append(a.aggrRows, row)
}
err = a.updateRowAggrFunc(row, kvps[i], ctx)
if err != nil {
return err
}
}
}
a.prepared = true
return nil
}
func (a *AggregatePlan) batchGetAggrKeys(chunk []KVPair, ctx *ExecuteCtx) ([]string, error) {
ret := make([]string, len(chunk))
if a.AggrAll {
for i := 0; i < len(chunk); i++ {
ret[i] = defaultAggrKey
}
return ret, nil
}
var (
fields = make([][]any, len(a.GroupByFields))
aggKey = make([]byte, 0, 10)
err error
)
for i, f := range a.GroupByFields {
fields[i], err = f.Expr.ExecuteBatch(chunk, ctx)
if err != nil {
return nil, err
}
}
for i := 0; i < len(chunk); i++ {
aggKey = aggKey[:0]
for j := 0; j < len(fields); j++ {
bval, err := a.convertToBytes(fields[j][i])
if err != nil {
return nil, err
}
aggKey = append(aggKey, bval...)
}
ret[i] = string(aggKey)
}
return ret, nil
}
func (a *AggregatePlan) updateRowAggrFunc(row []*AggrPlanField, kvp KVPair, ctx *ExecuteCtx) error {
for _, col := range row {
if col.IsKey {
continue
}
fcexprs := col.FuncExprs
if len(fcexprs) == 0 {
return NewExecuteError(0, "Cannot cast expression to function call expression")
}
for i, fcexpr := range fcexprs {
err := col.Funcs[i].Update(kvp, fcexpr.Args, ctx)
if err != nil {
return err
}
}
}
return nil
}
func (a *AggregatePlan) createAggrRow(kvp KVPair, ctx *ExecuteCtx) ([]*AggrPlanField, error) {
row := make([]*AggrPlanField, len(a.aggrFields))
for i, r := range a.aggrFields {
col := &AggrPlanField{
ID: r.ID,
Name: r.Name,
IsKey: r.IsKey,
Expr: r.Expr,
FuncExprs: r.FuncExprs,
Funcs: nil,
}
if len(r.Funcs) > 0 {
for _, f := range r.Funcs {
col.Funcs = append(col.Funcs, f.Clone())
}
}
if col.IsKey {
exprResult, err := a.execExpr(kvp, col.Expr, ctx)
if err != nil {
return nil, err
}
col.Value = exprResult
}
row[i] = col
}
return row, nil
}
func (a *AggregatePlan) Batch(ctx *ExecuteCtx) ([][]Column, error) {
if !a.prepared {
err := a.prepareBatch(ctx)
if err != nil {
return nil, err
}
}
if a.Limit < 0 {
return a.batch(ctx)
}
var (
rows [][]Column
err error
ret = make([][]Column, 0, PlanBatchSize)
finish = false
count = 0
)
for a.skips < a.Start {
restSkips := a.Start - a.skips
rows, err = a.batch(ctx)
if err != nil {
return nil, err
}
nrows := len(rows)
if nrows == 0 {
return nil, nil
}
if nrows <= restSkips {
a.skips += nrows
} else {
a.skips += restSkips
rows = rows[restSkips:]
// Skip finish break is OK
break
}
}
if len(rows) > 0 {
for _, row := range rows {
if a.current >= a.Limit {
break
}
ret = append(ret, row)
count++
a.current++
}
}
if a.current >= a.Limit {
return ret, nil
}
for !finish {
rows, err = a.batch(ctx)
if err != nil {
return nil, err
}
if len(rows) == 0 {
finish = true
break
}
for _, row := range rows {
ret = append(ret, row)
count++
a.current++
if a.current >= a.Limit {
finish = true
break
}
}
if count >= PlanBatchSize {
finish = true
break
}
}
return ret, nil
}
func (a *AggregatePlan) batch(ctx *ExecuteCtx) ([][]Column, error) {
var (
err error
ret = make([][]Column, 0, PlanBatchSize)
count = 0
)
if a.pos >= len(a.aggrRows) {
return nil, nil
}
for count < PlanBatchSize {
aggrRow := a.aggrRows[a.pos]
a.pos++
row := make([]Column, len(a.aggrFields))
for i, col := range aggrRow {
if col.IsKey {
row[i] = col.Value
} else {
for i, f := range col.Funcs {
val, err := f.Complete()
if err != nil {
return nil, err
}
col.FuncExprs[i].Result = val
}
row[i], err = col.Expr.Execute(NewKVP(nil, nil), ctx)
if err != nil {
return nil, err
}
}
}
ret = append(ret, row)
count++
if a.pos >= len(a.aggrRows) {
break
}
}
return ret, nil
}
func (a *AggregatePlan) Next(ctx *ExecuteCtx) ([]Column, error) {
if !a.prepared {
err := a.prepare(ctx)
if err != nil {
return nil, err
}
}
if a.Limit < 0 {
return a.next(ctx)
}
for a.skips < a.Start {
row, err := a.next(ctx)
if err != nil {
return nil, err
}
if row == nil && err == nil {
return nil, nil
}
a.skips++
}
if a.current >= a.Limit {
return nil, nil
}
row, err := a.next(ctx)
if err != nil {
return nil, err
}
if row == nil && err == nil {
return nil, nil
}
a.current++
return row, nil
}
func (a *AggregatePlan) next(ctx *ExecuteCtx) ([]Column, error) {
var err error
if a.pos >= len(a.aggrRows) {
return nil, nil
}
aggrRow := a.aggrRows[a.pos]
a.pos++
row := make([]Column, len(a.aggrFields))
for i, col := range aggrRow {
if col.IsKey {
row[i] = col.Value
} else {
for i, f := range col.Funcs {
val, err := f.Complete()
if err != nil {
return nil, err
}
col.FuncExprs[i].Result = val
}
row[i], err = col.Expr.Execute(NewKVP(nil, nil), ctx)
if err != nil {
return nil, err
}
}
}
return row, nil
}
func (a *AggregatePlan) getAggrKey(key []byte, val []byte, ctx *ExecuteCtx) (string, error) {
if a.AggrAll {
return defaultAggrKey, nil
}
gkey := ""
kvp := NewKVP(key, val)
for _, f := range a.GroupByFields {
eval, err := f.Expr.Execute(kvp, ctx)
if err != nil {
return "", err
}
bval, err := a.convertToBytes(eval)
if err != nil {
return "", err
}
gkey += string(bval)
}
return gkey, nil
}
func (a *AggregatePlan) execExpr(kvp KVPair, expr Expression, ctx *ExecuteCtx) ([]byte, error) {
result, err := expr.Execute(kvp, ctx)
if err != nil {
return nil, err
}
return a.convertToBytes(result)
}
func (a *AggregatePlan) convertToBytes(val any) ([]byte, error) {
switch value := val.(type) {
case bool:
if value {
return []byte("true"), nil
} else {
return []byte("false"), nil
}
case []byte:
return value, nil
case string:
return []byte(value), nil
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
return []byte(fmt.Sprintf("%d", value)), nil
case float32, float64:
return []byte(fmt.Sprintf("%f", value)), nil
default:
if val == nil {
return nil, nil
}
return nil, NewExecuteError(0, "Expression result type not support")
}
}