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column.go
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column.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 (
"fmt"
"github.com/ClickHouse/ch-go/proto"
"reflect"
"regexp"
"strings"
)
// column names which match this must be escaped - see https://clickhouse.com/docs/en/sql-reference/syntax/#identifiers
var escapeColRegex = regexp.MustCompile("^[a-zA-Z_][0-9a-zA-Z_]*$")
// to escape and unescape special chars
var colEscape = strings.NewReplacer("`", "\\`", "\\", "\\\\")
var colUnEscape = strings.NewReplacer("\\`", "`", "\\\\", "\\")
type Type string
func (t Type) params() string {
switch start, end := strings.Index(string(t), "("), strings.LastIndex(string(t), ")"); {
case len(t) == 0, start <= 0, end <= 0, end < start:
return ""
default:
return string(t[start+1 : end])
}
}
type Error struct {
ColumnType string
Err error
}
func (e *Error) Error() string {
return fmt.Sprintf("%s: %s", e.ColumnType, e.Err)
}
type ColumnConverterError struct {
Op string
Hint string
From, To string
}
func (e *ColumnConverterError) Error() string {
var hint string
if len(e.Hint) != 0 {
hint += ". " + e.Hint
}
return fmt.Sprintf("clickhouse [%s]: converting %s to %s is unsupported%s", e.Op, e.From, e.To, hint)
}
type UnsupportedColumnTypeError struct {
t Type
}
func (e *UnsupportedColumnTypeError) Error() string {
return fmt.Sprintf("clickhouse: unsupported column type %q", e.t)
}
type Interface interface {
Name() string
Type() Type
Rows() int
Row(i int, ptr bool) any
ScanRow(dest any, row int) error
Append(v any) (nulls []uint8, err error)
AppendRow(v any) error
Decode(reader *proto.Reader, rows int) error
Encode(buffer *proto.Buffer)
ScanType() reflect.Type
Reset()
}
type CustomSerialization interface {
ReadStatePrefix(*proto.Reader) error
WriteStatePrefix(*proto.Buffer) error
}