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nothing.go
60 lines (54 loc) · 1.91 KB
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nothing.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 (
"errors"
"reflect"
"github.com/ClickHouse/clickhouse-go/v2/lib/binary"
)
type Nothing struct{}
func (Nothing) Type() Type { return "Nothing" }
func (Nothing) ScanType() reflect.Type { return reflect.TypeOf(nil) }
func (Nothing) Rows() int { return 0 }
func (Nothing) Row(int, bool) interface{} { return nil }
func (Nothing) ScanRow(interface{}, int) error { return nil }
func (Nothing) Append(interface{}) ([]uint8, error) {
return nil, &Error{
ColumnType: "Nothing",
Err: errors.New("data type values can't be stored in tables"),
}
}
func (Nothing) AppendRow(interface{}) error {
return &Error{
ColumnType: "Nothing",
Err: errors.New("data type values can't be stored in tables"),
}
}
func (Nothing) Decode(decoder *binary.Decoder, rows int) error {
scratch := make([]byte, rows)
if err := decoder.Raw(scratch); err != nil {
return err
}
return nil
}
func (Nothing) Encode(*binary.Encoder) error {
return &Error{
ColumnType: "Nothing",
Err: errors.New("data type values can't be stored in tables"),
}
}
var _ Interface = (*Nothing)(nil)