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package proto
import (
"fmt"
"github.com/go-faster/errors"
)
// Nothing represents NULL value.
type Nothing struct{}
// ColNothing represents column of null values.
// Value is row count.
//
// https://clickhouse.com/docs/ru/sql-reference/data-types/special-data-types/nothing
type ColNothing int
func (c *ColNothing) Append(_ Nothing) {
*c++
}
func (c *ColNothing) AppendArr(vs []Nothing) {
*c = ColNothing(int(*c) + len(vs))
}
func (c ColNothing) Row(i int) Nothing {
if i >= int(c) {
panic(fmt.Sprintf("[%d] of [%d]Nothing", i, c))
}
return Nothing{}
}
func (c ColNothing) Type() ColumnType {
return ColumnTypeNothing
}
func (c ColNothing) Rows() int {
return int(c)
}
func (c *ColNothing) DecodeColumn(r *Reader, rows int) error {
*c = ColNothing(rows)
if rows == 0 {
return nil
}
if _, err := r.ReadRaw(rows); err != nil {
return errors.Wrap(err, "read")
}
return nil
}
func (c *ColNothing) Reset() {
*c = 0
}
func (c *ColNothing) Nullable() *ColNullable[Nothing] {
return &ColNullable[Nothing]{
Values: c,
}
}
func (c *ColNothing) Array() *ColArr[Nothing] {
return &ColArr[Nothing]{
Data: c,
}
}
func (c ColNothing) EncodeColumn(b *Buffer) {
if c == 0 {
return
}
b.PutRaw(make([]byte, c))
}
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