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nullable.go
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nullable.go
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// Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package column
import (
"reflect"
"github.com/timeplus-io/proton-go-driver/v2/lib/binary"
)
type Nullable struct {
base Interface
nulls UInt8
enable bool
scanType reflect.Type
}
func (col *Nullable) parse(t Type) (_ *Nullable, err error) {
col.enable = true
if col.base, err = Type(t.params()).Column(); err != nil {
return nil, err
}
switch base := col.base.ScanType(); {
case base == nil:
col.scanType = reflect.TypeOf(nil)
case base.Kind() == reflect.Ptr:
col.scanType = base
default:
col.scanType = reflect.New(base).Type()
}
return col, nil
}
func (col *Nullable) Base() Interface {
return col.base
}
func (col *Nullable) Type() Type {
return "nullable(" + col.base.Type() + ")"
}
func (col *Nullable) ScanType() reflect.Type {
return col.scanType
}
func (col *Nullable) Rows() int {
if !col.enable {
return col.base.Rows()
}
return len(col.nulls)
}
func (col *Nullable) Row(i int, ptr bool) interface{} {
if col.enable {
if col.nulls[i] == 1 {
return nil
}
}
return col.base.Row(i, ptr)
}
func (col *Nullable) ScanRow(dest interface{}, row int) error {
if col.enable {
if col.nulls[row] == 1 {
return nil
}
}
return col.base.ScanRow(dest, row)
}
func (col *Nullable) Append(v interface{}) ([]uint8, error) {
nulls, err := col.base.Append(v)
if err != nil {
return nil, err
}
col.nulls = append(col.nulls, nulls...)
return nulls, nil
}
func (col *Nullable) AppendRow(v interface{}) error {
if v == nil || (reflect.ValueOf(v).Kind() == reflect.Ptr && reflect.ValueOf(v).IsNil()) {
col.nulls = append(col.nulls, 1)
} else {
col.nulls = append(col.nulls, 0)
}
return col.base.AppendRow(v)
}
func (col *Nullable) Decode(decoder *binary.Decoder, rows int) (err error) {
if col.enable {
if err := col.nulls.Decode(decoder, rows); err != nil {
return err
}
}
if err := col.base.Decode(decoder, rows); err != nil {
return err
}
return nil
}
func (col *Nullable) Encode(encoder *binary.Encoder) error {
if col.enable {
if err := col.nulls.Encode(encoder); err != nil {
return err
}
}
if err := col.base.Encode(encoder); err != nil {
return err
}
return nil
}
var _ Interface = (*Nullable)(nil)