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function_bind.go
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function_bind.go
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package internal
import (
"errors"
"fmt"
"sync"
"github.com/goccy/go-json"
)
type SQLiteFunction func(...interface{}) (interface{}, error)
type BindFunction func(...Value) (Value, error)
type AggregateBindFunction func() func() *Aggregator
type WindowBindFunction func() func() *WindowAggregator
type FuncInfo struct {
Name string
BindFunc BindFunction
}
type AggregateFuncInfo struct {
Name string
BindFunc AggregateBindFunction
}
type WindowFuncInfo struct {
Name string
BindFunc WindowBindFunction
}
func existsNull(args []Value) bool {
for _, v := range args {
if v == nil {
return true
}
}
return false
}
func convertArgs(args ...interface{}) ([]Value, error) {
values := make([]Value, 0, len(args))
for _, arg := range args {
value, err := DecodeValue(arg)
if err != nil {
return nil, err
}
values = append(values, value)
}
return values, nil
}
type Aggregator struct {
distinctMap map[string]struct{}
distinctNil bool
step func([]Value, *AggregatorOption) error
done func() (Value, error)
}
func (a *Aggregator) Step(stepArgs ...interface{}) error {
values, err := convertArgs(stepArgs...)
if err != nil {
return err
}
values, opt, err := parseAggregateOptions(values...)
if err != nil {
return err
}
if opt.IgnoreNulls {
filtered := []Value{}
for _, v := range values {
if v == nil {
continue
}
filtered = append(filtered, v)
}
values = filtered
if len(values) == 0 {
return nil
}
}
if opt.Distinct {
if len(values) < 1 {
return fmt.Errorf("DISTINCT option required at least one argument")
}
if values[0] == nil {
if a.distinctNil {
return nil
}
a.distinctNil = true
} else {
key, err := values[0].ToString()
if err != nil {
return err
}
if _, exists := a.distinctMap[key]; exists {
return nil
}
a.distinctMap[key] = struct{}{}
}
}
return a.step(values, opt)
}
func (a *Aggregator) Done() (interface{}, error) {
ret, err := a.done()
if err != nil {
return nil, err
}
return EncodeValue(ret)
}
func newAggregator(
step func([]Value, *AggregatorOption) error,
done func() (Value, error)) *Aggregator {
return &Aggregator{
distinctMap: map[string]struct{}{},
step: step,
done: done,
}
}
type WindowAggregator struct {
distinctMap map[string]struct{}
agg *WindowFuncAggregatedStatus
step func([]Value, *WindowFuncStatus, *WindowFuncAggregatedStatus) error
done func(*WindowFuncAggregatedStatus) (Value, error)
once sync.Once
}
func (a *WindowAggregator) Step(stepArgs ...interface{}) error {
values, err := convertArgs(stepArgs...)
if err != nil {
return err
}
values, opt, err := parseAggregateOptions(values...)
if err != nil {
return err
}
values, windowOpt, err := parseWindowOptions(values...)
if err != nil {
return err
}
a.once.Do(func() {
a.agg.opt = opt
})
return a.step(values, windowOpt, a.agg)
}
func (a *WindowAggregator) Done() (interface{}, error) {
ret, err := a.done(a.agg)
if err != nil {
return nil, err
}
return EncodeValue(ret)
}
func newWindowAggregator(
step func([]Value, *WindowFuncStatus, *WindowFuncAggregatedStatus) error,
done func(*WindowFuncAggregatedStatus) (Value, error)) *WindowAggregator {
return &WindowAggregator{
distinctMap: map[string]struct{}{},
agg: newWindowFuncAggregatedStatus(),
step: step,
done: done,
}
}
func bindAdd(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return ADD(args[0], args[1])
}
func bindSub(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return SUB(args[0], args[1])
}
func bindMul(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return MUL(args[0], args[1])
}
func bindOpDiv(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return OP_DIV(args[0], args[1])
}
func bindEqual(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return EQ(args[0], args[1])
}
func bindNotEqual(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return NOT_EQ(args[0], args[1])
}
func bindGreater(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return GT(args[0], args[1])
}
func bindGreaterOrEqual(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return GTE(args[0], args[1])
}
func bindLess(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return LT(args[0], args[1])
}
func bindLessOrEqual(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return LTE(args[0], args[1])
}
func bindBitNot(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return BIT_NOT(args[0])
}
func bindBitLeftShift(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return BIT_LEFT_SHIFT(args[0], args[1])
}
func bindBitRightShift(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return BIT_RIGHT_SHIFT(args[0], args[1])
}
func bindBitAnd(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return BIT_AND(args[0], args[1])
}
func bindBitOr(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return BIT_OR(args[0], args[1])
}
func bindBitXor(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return BIT_XOR(args[0], args[1])
}
func bindInArray(args ...Value) (Value, error) {
if existsNull(args) {
return BoolValue(false), nil
}
return ARRAY_IN(args[0], args[1])
}
func bindStructField(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
i64, err := args[1].ToInt64()
if err != nil {
return nil, err
}
return STRUCT_FIELD(args[0], int(i64))
}
func bindJsonField(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
jsonValue, err := args[0].ToString()
if err != nil {
return nil, err
}
fieldName, err := args[1].ToString()
if err != nil {
return nil, err
}
return JSON_FIELD(jsonValue, fieldName)
}
func bindSubscript(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
jsonValue, err := args[0].ToString()
if err != nil {
return nil, err
}
return JSON_SUBSCRIPT(jsonValue, args[1])
}
func bindArrayAtOffset(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
i64, err := args[1].ToInt64()
if err != nil {
return nil, err
}
return ARRAY_OFFSET(args[0], int(i64))
}
func bindSafeArrayAtOffset(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
i64, err := args[1].ToInt64()
if err != nil {
return nil, err
}
return ARRAY_SAFE_OFFSET(args[0], int(i64))
}
func bindArrayAtOrdinal(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
i64, err := args[1].ToInt64()
if err != nil {
return nil, err
}
return ARRAY_ORDINAL(args[0], int(i64))
}
func bindSafeArrayAtOrdinal(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
i64, err := args[1].ToInt64()
if err != nil {
return nil, err
}
return ARRAY_SAFE_ORDINAL(args[0], int(i64))
}
func bindIsDistinctFrom(args ...Value) (Value, error) {
return IS_DISTINCT_FROM(args[0], args[1])
}
func bindIsNotDistinctFrom(args ...Value) (Value, error) {
return IS_NOT_DISTINCT_FROM(args[0], args[1])
}
func bindExtract(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
part, err := args[1].ToString()
if err != nil {
return nil, err
}
zone := "UTC"
if len(args) == 3 {
timeZone, err := args[2].ToString()
if err != nil {
return nil, err
}
zone = timeZone
}
return EXTRACT(args[0], part, zone)
}
func bindExtractDate(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
zone := "UTC"
if len(args) == 2 {
timeZone, err := args[1].ToString()
if err != nil {
return nil, err
}
zone = timeZone
}
return EXTRACT(args[0], "DATE", zone)
}
func bindSessionUser(_ ...Value) (Value, error) {
return SESSION_USER()
}
func bindGenerateUUID(_ ...Value) (Value, error) {
return GENERATE_UUID()
}
func bindError(args ...Value) (Value, error) {
if args[0] == nil {
return nil, nil
}
v, err := args[0].ToString()
if err != nil {
return nil, err
}
return nil, errors.New(v)
}
func bindBitCount(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return BIT_COUNT(args[0])
}
func bindLike(args ...Value) (Value, error) {
if existsNull(args) {
return BoolValue(false), nil
}
return LIKE(args[0], args[1])
}
func bindBetween(args ...Value) (Value, error) {
if existsNull(args) {
return BoolValue(false), nil
}
return BETWEEN(args[0], args[1], args[2])
}
func bindIn(args ...Value) (Value, error) {
return IN(args[0], args[1:]...)
}
func bindIsNull(args ...Value) (Value, error) {
return IS_NULL(args[0])
}
func bindIsTrue(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return IS_TRUE(args[0])
}
func bindIsFalse(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return IS_FALSE(args[0])
}
func bindNot(args ...Value) (Value, error) {
if existsNull(args) {
return nil, nil
}
return NOT(args[0])
}
func bindAnd(args ...Value) (Value, error) {
return AND(args...)
}
func bindOr(args ...Value) (Value, error) {
return OR(args...)
}
func bindCoalesce(args ...Value) (Value, error) {
if len(args) == 0 {
return nil, fmt.Errorf("COALESCE: invalid argument num %d", len(args))
}
return COALESCE(args...)
}
func bindIf(args ...Value) (Value, error) {
if len(args) != 3 {
return nil, fmt.Errorf("IF: invalid argument num %d", len(args))
}
return IF(args[0], args[1], args[2])
}
func bindIfNull(args ...Value) (Value, error) {
if len(args) != 2 {
return nil, fmt.Errorf("IFNULL: invalid argument num %d", len(args))
}
return IFNULL(args[0], args[1])
}
func bindNullIf(args ...Value) (Value, error) {
if len(args) != 2 {
return nil, fmt.Errorf("NULLIF: invalid argument num %d", len(args))
}
return NULLIF(args[0], args[1])
}
func bindCast(args ...Value) (Value, error) {
if len(args) != 4 {
return nil, fmt.Errorf("CAST: invalid argument num %d", len(args))
}
jsonEncodedFromType, err := args[1].ToString()
if err != nil {
return nil, err
}
jsonEncodedToType, err := args[2].ToString()
if err != nil {
return nil, err
}
var fromType Type
if err := json.Unmarshal([]byte(jsonEncodedFromType), &fromType); err != nil {
return nil, err
}
var toType Type
if err := json.Unmarshal([]byte(jsonEncodedToType), &toType); err != nil {
return nil, err
}
isSafeCast, err := args[3].ToBool()
if err != nil {
return nil, err
}
return CAST(args[0], &fromType, &toType, isSafeCast)
}
func bindInterval(args ...Value) (Value, error) {
value, err := args[0].ToInt64()
if err != nil {
return nil, err
}
part, err := args[1].ToString()
if err != nil {
return nil, err
}
return INTERVAL(value, part)
}
func bindMakeInterval(args ...Value) (Value, error) {
year, err := args[0].ToInt64()
if err != nil {
return nil, err
}
month, err := args[1].ToInt64()
if err != nil {
return nil, err
}
day, err := args[2].ToInt64()
if err != nil {
return nil, err
}
hour, err := args[3].ToInt64()
if err != nil {
return nil, err
}
minute, err := args[4].ToInt64()
if err != nil {
return nil, err
}
second, err := args[5].ToInt64()
if err != nil {
return nil, err
}
return MAKE_INTERVAL(year, month, day, hour, minute, second)
}
func bindJustifyDays(args ...Value) (Value, error) {
interval, ok := args[0].(*IntervalValue)
if !ok {
return nil, fmt.Errorf("JUSTIFY_DAYS: unexpected argument type %T", args[0])
}
return JUSTIFY_DAYS(interval)
}
func bindJustifyHours(args ...Value) (Value, error) {
interval, ok := args[0].(*IntervalValue)
if !ok {
return nil, fmt.Errorf("JUSTIFY_HOURS: unexpected argument type %T", args[0])
}
return JUSTIFY_HOURS(interval)
}
func bindJustifyInterval(args ...Value) (Value, error) {
interval, ok := args[0].(*IntervalValue)
if !ok {
return nil, fmt.Errorf("JUSTIFY_INTERVAL: unexpected argument type %T", args[0])
}
return JUSTIFY_INTERVAL(interval)
}
func bindParseNumeric(args ...Value) (Value, error) {
numeric, err := args[0].ToString()
if err != nil {
return nil, err
}
return PARSE_NUMERIC(numeric)
}
func bindParseBigNumeric(args ...Value) (Value, error) {
numeric, err := args[0].ToString()
if err != nil {
return nil, err
}
return PARSE_BIGNUMERIC(numeric)
}
func bindFarmFingerprint(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("FARM_FINGERPRINT: invalid argument num %d", len(args))
}
if existsNull(args) {
return nil, nil
}
v, err := args[0].ToBytes()
if err != nil {
return nil, err
}
return FARM_FINGERPRINT(v)
}
func bindMD5(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("MD5: invalid argument num %d", len(args))
}
if existsNull(args) {
return nil, nil
}
v, err := args[0].ToBytes()
if err != nil {
return nil, err
}
return MD5(v)
}
func bindSha1(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("SHA1: invalid argument num %d", len(args))
}
if existsNull(args) {
return nil, nil
}
v, err := args[0].ToBytes()
if err != nil {
return nil, err
}
return SHA1(v)
}
func bindSha256(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("SHA256: invalid argument num %d", len(args))
}
if existsNull(args) {
return nil, nil
}
v, err := args[0].ToBytes()
if err != nil {
return nil, err
}
return SHA256(v)
}
func bindSha512(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("SHA512: invalid argument num %d", len(args))
}
if existsNull(args) {
return nil, nil
}
v, err := args[0].ToBytes()
if err != nil {
return nil, err
}
return SHA512(v)
}
func bindAscii(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("ASCII: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
ascii, err := args[0].ToString()
if err != nil {
return nil, err
}
if ascii == "" {
return IntValue(0), nil
}
return ASCII(ascii)
}
func bindByteLength(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("BYTE_LENGTH: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
v, err := args[0].ToBytes()
if err != nil {
return nil, err
}
return BYTE_LENGTH(v)
}
func bindCharLength(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("CHAR_LENGTH: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
v, err := args[0].ToBytes()
if err != nil {
return nil, err
}
return CHAR_LENGTH(v)
}
func bindChr(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("CHR: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
v, err := args[0].ToInt64()
if err != nil {
return nil, err
}
return CHR(v)
}
func bindCodePointsToBytes(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("CODE_POINTS_TO_BYTES: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
v, err := args[0].ToArray()
if err != nil {
return nil, err
}
return CODE_POINTS_TO_BYTES(v)
}
func bindCodePointsToString(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("CODE_POINTS_TO_STRING: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
v, err := args[0].ToArray()
if err != nil {
return nil, err
}
return CODE_POINTS_TO_STRING(v)
}
func bindCollate(args ...Value) (Value, error) {
if len(args) != 2 {
return nil, fmt.Errorf("COLLATE: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
if args[1] == nil {
return nil, fmt.Errorf("COLLATE: collation_specification must be string literal")
}
value, err := args[0].ToString()
if err != nil {
return nil, fmt.Errorf("COLLATE: value must be string: %w", err)
}
spec, err := args[1].ToString()
if err != nil {
return nil, fmt.Errorf("COLLATE: collation_specification must be string literal: %w", err)
}
return COLLATE(value, spec)
}
func bindConcat(args ...Value) (Value, error) {
if len(args) < 2 {
return nil, fmt.Errorf("CONCAT: invalid argument num %d", len(args))
}
return CONCAT(args...)
}
func bindContainsSubstr(args ...Value) (Value, error) {
if args[1] == nil {
return nil, fmt.Errorf("CONTAINS_SUBSTR: search literal must be not null")
}
search, err := args[1].ToString()
if err != nil {
return nil, err
}
return CONTAINS_SUBSTR(args[0], search)
}
func bindEndsWith(args ...Value) (Value, error) {
if len(args) != 2 {
return nil, fmt.Errorf("ENDS_WITH: invalid argument num %d", len(args))
}
return ENDS_WITH(args[0], args[1])
}
func bindFormat(args ...Value) (Value, error) {
if len(args) == 0 {
return nil, fmt.Errorf("FORMAT: invalid argument num %d", len(args))
}
format, err := args[0].ToString()
if err != nil {
return nil, err
}
if len(args) > 1 {
if args[1] == nil {
return nil, nil
}
return FORMAT(format, args[1:]...)
}
return FORMAT(format)
}
func bindFromBase32(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("FROM_BASE32: invalid argument num %d", len(args))
}
v, err := args[0].ToString()
if err != nil {
return nil, err
}
return FROM_BASE32(v)
}
func bindFromBase64(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("FROM_BASE64: invalid argument num %d", len(args))
}
v, err := args[0].ToString()
if err != nil {
return nil, err
}
return FROM_BASE64(v)
}
func bindFromHex(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("FROM_HEX: invalid argument num %d", len(args))
}
v, err := args[0].ToString()
if err != nil {
return nil, err
}
return FROM_HEX(v)
}
func bindInitcap(args ...Value) (Value, error) {
if len(args) != 1 && len(args) != 2 {
return nil, fmt.Errorf("INITCAP: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
var delimiters []rune
if len(args) == 2 {
if args[1] == nil {
return nil, nil
}
v, err := args[1].ToString()
if err != nil {
return nil, err
}
delimiters = []rune{}
for _, vv := range v {
delimiters = append(delimiters, vv)
}
}
value, err := args[0].ToString()
if err != nil {
return nil, err
}
return INITCAP(value, delimiters)
}
func bindInstr(args ...Value) (Value, error) {
if len(args) != 2 && len(args) != 3 && len(args) != 4 {
return nil, fmt.Errorf("INSTR: invalid argument num %d", len(args))
}
if args[0] == nil {
return nil, nil
}
if args[1] == nil {
return nil, nil
}
var (
position int64 = 0
occurrence int64 = 1
)
if len(args) >= 3 {
pos, err := args[2].ToInt64()
if err != nil {
return nil, err
}
position = pos
}
if len(args) == 4 {
occur, err := args[3].ToInt64()
if err != nil {
return nil, err
}
occurrence = occur
}
return INSTR(args[0], args[1], position, occurrence)
}
func bindLeft(args ...Value) (Value, error) {
if len(args) != 2 {
return nil, fmt.Errorf("LEFT: invalid argument num %d", len(args))
}
length, err := args[1].ToInt64()
if err != nil {
return nil, err
}
return LEFT(args[0], length)
}
func bindLength(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("LENGTH: invalid argument num %d", len(args))
}
if args[0] == nil {
return IntValue(0), nil
}
return LENGTH(args[0])
}
func bindLpad(args ...Value) (Value, error) {
if len(args) != 2 && len(args) != 3 {
return nil, fmt.Errorf("LPAD: invalid argument num %d", len(args))
}
var pattern Value
if len(args) == 3 {
pattern = args[2]
}
length, err := args[1].ToInt64()
if err != nil {
return nil, err
}
return LPAD(args[0], length, pattern)
}
func bindLower(args ...Value) (Value, error) {
if len(args) != 1 {
return nil, fmt.Errorf("LOWER: invalid argument num %d", len(args))
}
return LOWER(args[0])
}
func bindLtrim(args ...Value) (Value, error) {
if len(args) != 1 && len(args) != 2 {
return nil, fmt.Errorf("LTRIM: invalid argument num %d", len(args))
}
cutset := " "
if len(args) == 2 {
v, err := args[1].ToString()
if err != nil {
return nil, err
}
cutset = v
}
return LTRIM(args[0], cutset)
}
func bindNormalize(args ...Value) (Value, error) {
if len(args) != 1 && len(args) != 2 {
return nil, fmt.Errorf("NORMALIZE: invalid argument num %d", len(args))
}
mode := "NFC"
if len(args) == 2 {
v, err := args[1].ToString()
if err != nil {
return nil, err