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interval.go
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/
interval.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"
"fmt"
"github.com/ClickHouse/ch-go/proto"
"reflect"
"strings"
)
type Interval struct {
chType Type
name string
col proto.ColInt64
}
func (col *Interval) Reset() {
col.col.Reset()
}
func (col *Interval) Name() string {
return col.name
}
func (col *Interval) parse(t Type) (Interface, error) {
switch col.chType = t; col.chType {
case "IntervalSecond", "IntervalMinute", "IntervalHour", "IntervalDay", "IntervalWeek", "IntervalMonth", "IntervalYear":
return col, nil
}
return nil, &UnsupportedColumnTypeError{
t: t,
}
}
func (col *Interval) Type() Type { return col.chType }
func (col *Interval) ScanType() reflect.Type { return scanTypeString }
func (col *Interval) Rows() int { return col.col.Rows() }
func (col *Interval) Row(i int, ptr bool) any {
val := col.row(i)
if ptr {
return &val
}
return val
}
func (col *Interval) ScanRow(dest any, row int) error {
switch d := dest.(type) {
case *string:
*d = col.row(row)
case **string:
*d = new(string)
**d = col.row(row)
default:
return &ColumnConverterError{
Op: "ScanRow",
To: fmt.Sprintf("%T", dest),
From: "Interval",
}
}
return nil
}
func (Interval) Append(any) ([]uint8, error) {
return nil, &Error{
ColumnType: "Interval",
Err: errors.New("data type values can't be stored in tables"),
}
}
func (Interval) AppendRow(any) error {
return &Error{
ColumnType: "Interval",
Err: errors.New("data type values can't be stored in tables"),
}
}
func (col *Interval) Decode(reader *proto.Reader, rows int) error {
return col.col.DecodeColumn(reader, rows)
}
func (Interval) Encode(buffer *proto.Buffer) {
}
func (col *Interval) row(i int) string {
val := col.col.Row(i)
v := fmt.Sprintf("%d %s", val, strings.TrimPrefix(string(col.chType), "Interval"))
if val > 1 {
v += "s"
}
return v
}
var _ Interface = (*Interval)(nil)