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scalar.go
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scalar.go
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package scalar
import (
"fmt"
"reflect"
"github.com/apache/arrow/go/v16/arrow"
"github.com/apache/arrow/go/v16/arrow/array"
"github.com/apache/arrow/go/v16/arrow/float16"
"github.com/apache/arrow/go/v16/arrow/memory"
"github.com/cloudquery/plugin-sdk/v4/types"
"golang.org/x/exp/maps"
)
// Scalar represents a single value of a specific DataType as opposed to
// an array.
//
// Scalars are useful for passing single value inputs to compute functions
// (not yet implemented) or for representing individual array elements,
// (with a non-trivial cost though).
type Scalar interface {
fmt.Stringer
// IsValid returns true if the value is non-null, otherwise false.
IsValid() bool
// The datatype of the value in this scalar
DataType() arrow.DataType
// Performs cheap validation checks, returns nil if successful
// Validate() error
// tries to set the value of the scalar to the given value
Set(val any) error
Get() any
Equal(other Scalar) bool
}
type Vector []Scalar
func (v Vector) ToArrowRecord(sc *arrow.Schema) arrow.Record {
bldr := array.NewRecordBuilder(memory.DefaultAllocator, sc)
AppendToRecordBuilder(bldr, v)
rec := bldr.NewRecord()
return rec
}
func (v Vector) Equal(r Vector) bool {
if len(v) != len(r) {
return false
}
for i := range v {
if !v[i].Equal(r[i]) {
return false
}
}
return true
}
func NewScalar(dt arrow.DataType) Scalar {
switch dt.ID() {
case arrow.TIMESTAMP:
return &Timestamp{Type: dt.(*arrow.TimestampType)}
case arrow.BINARY:
return &Binary{}
case arrow.STRING:
return &String{}
case arrow.LARGE_BINARY:
return &LargeBinary{}
case arrow.LARGE_STRING:
return &LargeString{}
case arrow.INT64:
return &Int{BitWidth: 64}
case arrow.INT32:
return &Int{BitWidth: 32}
case arrow.INT16:
return &Int{BitWidth: 16}
case arrow.INT8:
return &Int{BitWidth: 8}
case arrow.UINT64:
return &Uint{BitWidth: 64}
case arrow.UINT32:
return &Uint{BitWidth: 32}
case arrow.UINT16:
return &Uint{BitWidth: 16}
case arrow.UINT8:
return &Uint{BitWidth: 8}
case arrow.FLOAT64:
return &Float{BitWidth: 64}
case arrow.FLOAT32:
return &Float{BitWidth: 32}
case arrow.FLOAT16:
return &Float{BitWidth: 16}
case arrow.BOOL:
return &Bool{}
case arrow.EXTENSION:
switch {
case arrow.TypeEqual(dt, types.ExtensionTypes.UUID):
return &UUID{}
case arrow.TypeEqual(dt, types.ExtensionTypes.JSON):
return &JSON{}
case arrow.TypeEqual(dt, types.ExtensionTypes.MAC):
return &Mac{}
case arrow.TypeEqual(dt, types.ExtensionTypes.Inet):
return &Inet{}
default:
panic("not implemented extension: " + dt.Name())
}
case arrow.LIST:
return &List{
Type: dt,
}
case arrow.DATE64:
return &Date64{}
case arrow.DATE32:
return &Date32{}
case arrow.DURATION:
return &Duration{Int: Int{BitWidth: 64}, Unit: dt.(*arrow.DurationType).Unit}
case arrow.TIME32:
return &Time{
Int: Int{BitWidth: 32},
Unit: dt.(*arrow.Time32Type).Unit,
}
case arrow.TIME64:
return &Time{
Int: Int{BitWidth: 64},
Unit: dt.(*arrow.Time64Type).Unit,
}
case arrow.INTERVAL_MONTHS:
return &MonthInterval{Int{BitWidth: 32}}
case arrow.INTERVAL_DAY_TIME:
return &DayTimeInterval{}
case arrow.INTERVAL_MONTH_DAY_NANO:
return &MonthDayNanoInterval{}
case arrow.STRUCT:
return &Struct{Type: dt.(*arrow.StructType)}
case arrow.DECIMAL128:
return &Decimal128{Type: dt.(*arrow.Decimal128Type)}
case arrow.DECIMAL256:
return &Decimal256{Type: dt.(*arrow.Decimal256Type)}
default:
panic("not implemented: " + dt.Name())
}
}
func AppendToBuilder(bldr array.Builder, s Scalar) {
if !s.IsValid() {
bldr.AppendNull()
return
}
switch s.DataType().ID() {
case arrow.BINARY:
bldr.(*array.BinaryBuilder).Append(s.(*Binary).Value)
case arrow.LARGE_BINARY:
bldr.(*array.BinaryBuilder).Append(s.(*LargeBinary).Value)
case arrow.STRING:
bldr.(*array.StringBuilder).Append(s.(*String).Value)
case arrow.LARGE_STRING:
bldr.(*array.LargeStringBuilder).Append(s.(*LargeString).s.Value)
case arrow.INT64:
bldr.(*array.Int64Builder).Append(s.(*Int).Value)
case arrow.INT32:
bldr.(*array.Int32Builder).Append(int32(s.(*Int).Value))
case arrow.INT16:
bldr.(*array.Int16Builder).Append(int16(s.(*Int).Value))
case arrow.INT8:
bldr.(*array.Int8Builder).Append(int8(s.(*Int).Value))
case arrow.UINT64:
bldr.(*array.Uint64Builder).Append(s.(*Uint).Value)
case arrow.UINT32:
bldr.(*array.Uint32Builder).Append(uint32(s.(*Uint).Value))
case arrow.UINT16:
bldr.(*array.Uint16Builder).Append(uint16(s.(*Uint).Value))
case arrow.UINT8:
bldr.(*array.Uint8Builder).Append(uint8(s.(*Uint).Value))
case arrow.FLOAT16:
bldr.(*array.Float16Builder).Append(float16.New(float32(s.(*Float).Value)))
case arrow.FLOAT32:
bldr.(*array.Float32Builder).Append(float32(s.(*Float).Value))
case arrow.FLOAT64:
bldr.(*array.Float64Builder).Append(s.(*Float).Value)
case arrow.BOOL:
bldr.(*array.BooleanBuilder).Append(s.(*Bool).Value)
case arrow.TIMESTAMP:
bldr.(*array.TimestampBuilder).AppendTime(s.(*Timestamp).Value)
case arrow.DURATION:
bldr.(*array.DurationBuilder).Append(arrow.Duration(s.(*Duration).Value))
case arrow.DATE32:
bldr.(*array.Date32Builder).Append(s.(*Date32).Value)
case arrow.DATE64:
bldr.(*array.Date64Builder).Append(s.(*Date64).Value)
case arrow.TIME32:
bldr.(*array.Time32Builder).Append(arrow.Time32(int32(s.(*Time).Value)))
case arrow.TIME64:
bldr.(*array.Time64Builder).Append(arrow.Time64(s.(*Time).Value))
case arrow.INTERVAL_MONTHS:
bldr.(*array.MonthIntervalBuilder).Append(arrow.MonthInterval(int32(s.(*MonthInterval).Value)))
case arrow.INTERVAL_DAY_TIME:
bldr.(*array.DayTimeIntervalBuilder).Append(s.(*DayTimeInterval).Value)
case arrow.INTERVAL_MONTH_DAY_NANO:
bldr.(*array.MonthDayNanoIntervalBuilder).Append(s.(*MonthDayNanoInterval).Value)
case arrow.DECIMAL128:
bldr.(*array.Decimal128Builder).Append(s.(*Decimal128).Value)
case arrow.DECIMAL256:
bldr.(*array.Decimal256Builder).Append(s.(*Decimal256).Value)
case arrow.STRUCT:
sb := bldr.(*array.StructBuilder)
sb.Append(true)
v := s.(*Struct).Value
m, ok := v.(map[string]any)
if !ok {
reflectedMap := reflect.ValueOf(v)
if reflectedMap.Kind() != reflect.Map {
panic(fmt.Sprintf("expected map[string]any, got %T", v))
}
m = make(map[string]any, reflectedMap.Len())
for _, key := range reflectedMap.MapKeys() {
if key.Kind() != reflect.String {
panic(fmt.Sprintf("expected map[string]any, got %T", v))
}
value := reflectedMap.MapIndex(key)
m[key.String()] = value.Interface()
}
}
names := make(map[string]struct{}, len(m))
for k := range m {
names[k] = struct{}{}
}
st := sb.Type().(*arrow.StructType)
for i, f := range st.Fields() {
sc := NewScalar(sb.FieldBuilder(i).Type())
if sv, ok := m[f.Name]; ok {
if err := sc.Set(sv); err != nil {
panic(err)
}
delete(names, f.Name)
}
AppendToBuilder(sb.FieldBuilder(i), sc)
}
if len(names) > 0 {
panic(fmt.Errorf("struct has extra fields: %+v", maps.Keys(names)))
}
case arrow.LIST:
lb := bldr.(*array.ListBuilder)
lb.Append(true)
for _, v := range s.(*List).Value {
AppendToBuilder(lb.ValueBuilder(), v)
}
case arrow.EXTENSION:
switch {
case arrow.TypeEqual(s.DataType(), types.ExtensionTypes.UUID):
bldr.(*types.UUIDBuilder).Append(s.(*UUID).Value)
case arrow.TypeEqual(s.DataType(), types.ExtensionTypes.JSON):
bldr.(*types.JSONBuilder).AppendBytes(s.(*JSON).Value)
case arrow.TypeEqual(s.DataType(), types.ExtensionTypes.MAC):
bldr.(*types.MACBuilder).Append(s.(*Mac).Value)
case arrow.TypeEqual(s.DataType(), types.ExtensionTypes.Inet):
bldr.(*types.InetBuilder).Append(s.(*Inet).Value)
default:
panic("not implemented extension: " + s.DataType().Name())
}
default:
panic("not implemented: " + s.DataType().String())
}
}
func AppendToRecordBuilder(bldr *array.RecordBuilder, vector Vector) {
for i, scalar := range vector {
AppendToBuilder(bldr.Field(i), scalar)
}
}