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arrow.go
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arrow.go
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package types
import (
"fmt"
"strconv"
"time"
"github.com/apache/arrow/go/v10/arrow"
"github.com/apache/arrow/go/v10/arrow/array"
"github.com/goccy/go-zetasqlite"
bigqueryv2 "google.golang.org/api/bigquery/v2"
)
func TableToARROW(t *bigqueryv2.Table) (*arrow.Schema, error) {
fields := make([]arrow.Field, 0, len(t.Schema.Fields))
for _, field := range t.Schema.Fields {
f, err := TableFieldToARROW(field)
if err != nil {
return nil, err
}
fields = append(fields, *f)
}
return arrow.NewSchema(fields, nil), nil
}
func TableFieldToARROW(f *bigqueryv2.TableFieldSchema) (*arrow.Field, error) {
field, err := tableFieldToARROW(f)
if err != nil {
return nil, err
}
switch Mode(f.Mode) {
case RepeatedMode:
return &arrow.Field{
Name: f.Name,
Type: arrow.ListOfField(*field),
}, nil
case RequiredMode:
return field, nil
}
field.Nullable = true
return field, nil
}
func tableFieldToARROW(f *bigqueryv2.TableFieldSchema) (*arrow.Field, error) {
switch FieldType(f.Type) {
case FieldInteger:
return &arrow.Field{Name: f.Name, Type: arrow.PrimitiveTypes.Int64}, nil
case FieldBoolean:
return &arrow.Field{Name: f.Name, Type: arrow.FixedWidthTypes.Boolean}, nil
case FieldFloat:
return &arrow.Field{Name: f.Name, Type: arrow.PrimitiveTypes.Float64}, nil
case FieldString:
return &arrow.Field{Name: f.Name, Type: arrow.BinaryTypes.String}, nil
case FieldBytes:
return &arrow.Field{Name: f.Name, Type: arrow.BinaryTypes.Binary}, nil
case FieldDate:
return &arrow.Field{Name: f.Name, Type: arrow.PrimitiveTypes.Date32}, nil
case FieldDatetime:
return &arrow.Field{
Name: f.Name,
Type: arrow.FixedWidthTypes.Timestamp_us,
Metadata: arrow.MetadataFrom(
map[string]string{
"ARROW:extension:name": "google:sqlType:datetime",
},
),
}, nil
case FieldTime:
return &arrow.Field{Name: f.Name, Type: arrow.FixedWidthTypes.Time64us}, nil
case FieldTimestamp:
return &arrow.Field{Name: f.Name, Type: arrow.FixedWidthTypes.Timestamp_us}, nil
case FieldJSON:
return &arrow.Field{
Name: f.Name,
Type: arrow.BinaryTypes.String,
Metadata: arrow.MetadataFrom(
map[string]string{
"ARROW:extension:name": "google:sqlType:json",
},
),
}, nil
case FieldRecord:
fields := make([]arrow.Field, 0, len(f.Fields))
for _, field := range f.Fields {
fieldV, err := TableFieldToARROW(field)
if err != nil {
return nil, err
}
fields = append(fields, *fieldV)
}
return &arrow.Field{Name: f.Name, Type: arrow.StructOf(fields...)}, nil
case FieldNumeric:
// TODO: current arrow library doesn't support decimal type.
return &arrow.Field{Name: f.Name, Type: arrow.PrimitiveTypes.Float64}, nil
case FieldBignumeric:
// TODO: current arrow library doesn't support decimal type.
return &arrow.Field{Name: f.Name, Type: arrow.PrimitiveTypes.Float64}, nil
case FieldGeography:
return &arrow.Field{Name: f.Name, Type: arrow.BinaryTypes.String}, nil
case FieldInterval:
return &arrow.Field{Name: f.Name, Type: arrow.BinaryTypes.String}, nil
}
return nil, fmt.Errorf("unsupported arrow type %s", f.Type)
}
func AppendValueToARROWBuilder(ptrv *string, builder array.Builder) error {
if ptrv == nil {
builder.AppendNull()
return nil
}
v := *ptrv
switch b := builder.(type) {
case *array.Int64Builder:
i64, err := strconv.ParseInt(v, 10, 64)
if err != nil {
return err
}
b.Append(i64)
return nil
case *array.Float64Builder:
f64, err := strconv.ParseFloat(v, 64)
if err != nil {
return err
}
b.Append(f64)
return nil
case *array.BooleanBuilder:
cond, err := strconv.ParseBool(v)
if err != nil {
return err
}
b.Append(cond)
return nil
case *array.StringBuilder:
b.Append(v)
return nil
case *array.BinaryBuilder:
b.Append([]byte(v))
return nil
case *array.Date32Builder:
t, err := parseDate(v)
if err != nil {
return err
}
b.Append(arrow.Date32(int32(t.Sub(time.Unix(0, 0)) / (24 * time.Hour))))
return nil
case *array.Time64Builder:
t, err := parseTime(v)
if err != nil {
return err
}
b.Append(arrow.Time64(t.UnixMicro()))
case *array.TimestampBuilder:
t, err := zetasqlite.TimeFromTimestampValue(v)
if err != nil {
return err
}
b.Append(arrow.Timestamp(t.UnixMicro()))
return nil
}
return fmt.Errorf("unexpected builder type %T", builder)
}