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intcolumn.go
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/
intcolumn.go
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package cof
import (
"encoding/binary"
"io"
)
type IntColumn struct {
min int64
max int64
values []int64
}
func NewIntCol() *IntColumn {
return &IntColumn{
min: 0,
max: 0,
}
}
func (c *IntColumn) Type() string {
return "int"
}
func (i *IntColumn) Min() int64 {
return i.min
}
func (i *IntColumn) Max() int64 {
return i.max
}
func (i *IntColumn) Rows() int {
return len(i.values)
}
func (i *IntColumn) Add(value interface{}) error {
intVal, ok := value.(int64)
if !ok {
return ErrBadType
}
i.values = append(i.values, intVal)
// update min and max values
if intVal < i.min || i.min == 0 {
i.min = intVal
}
if intVal > i.max {
i.max = intVal
}
return nil
}
func (i *IntColumn) WriteTo(w io.Writer) (int64, error) {
written := int64(0)
buf := make([]byte, binary.MaxVarintLen64)
for _, v := range i.values {
n := binary.PutVarint(buf, v)
nwritten, err := w.Write(buf[:n])
if err != nil {
return written, err
}
written += int64(nwritten)
}
return written, nil
}
func (i *IntColumn) Reset() error {
i.values = []int64{}
i.min = 0
i.max = 0
return nil
}