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series.go
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series.go
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package series
import (
"fmt"
"os"
"reflect"
"github.com/apache/arrow/go/v14/arrow"
"github.com/apache/arrow/go/v14/arrow/array"
"github.com/apache/arrow/go/v14/arrow/memory"
"github.com/jedib0t/go-pretty/v6/table"
)
// Series is a generic type for series data
type Series[T any] struct {
Data arrow.Array
Name string
Dtype arrow.DataType
}
// NewSeries creates a new series of a given data type
func NewSeries[T any](name string, values []T) *Series[T] {
pool := memory.NewGoAllocator()
var arr arrow.Array
// Determine the type of the elements in the values slice
kind := reflect.TypeOf((*T)(nil)).Elem().Kind()
switch kind {
case reflect.Int, reflect.Int64:
b := array.NewInt64Builder(pool)
defer b.Release()
for _, v := range values {
val := reflect.ValueOf(v).Int()
b.Append(int64(val))
}
arr = b.NewArray()
case reflect.Float32, reflect.Float64:
b := array.NewFloat64Builder(pool)
defer b.Release()
for _, v := range values {
val := reflect.ValueOf(v).Float()
b.Append(val)
}
arr = b.NewArray()
case reflect.String:
b := array.NewStringBuilder(pool)
defer b.Release()
for _, v := range values {
val := reflect.ValueOf(v).String()
b.Append(val)
}
arr = b.NewArray()
// Add cases for other supported types
default:
panic("unsupported or unimplemented data type for Apache Arrow array")
}
return &Series[T]{
Data: arr,
Name: name,
Dtype: arr.DataType(),
}
}
func (s *Series[T]) GetName() string {
return s.Name
}
func (s *Series[T]) GetDataType() arrow.DataType {
return s.Dtype
}
func (s *Series[T]) GetData() arrow.Array {
return s.Data
}
func (s *Series[T]) Print() {
t := table.NewWriter()
t.SetOutputMirror(os.Stdout)
t.AppendHeader(table.Row{"Index", "Value"})
const maxDisplay = 10 // Maximum number of rows to display
var displayCount int
switch arr := s.Data.(type) {
case *array.Int64:
displayCount = min(arr.Len(), maxDisplay)
for i := 0; i < displayCount; i++ {
t.AppendRow(table.Row{i, arr.Value(i)})
}
case *array.Float64:
displayCount = min(arr.Len(), maxDisplay)
for i := 0; i < displayCount; i++ {
t.AppendRow(table.Row{i, arr.Value(i)})
}
// Add cases for other types as necessary
}
if displayCount < s.Data.Len() {
t.AppendFooter(table.Row{"", fmt.Sprintf("... Length: %d, dtype: %s", s.Data.Len(), s.Data.DataType())})
}
t.Render()
}