tidb types 源码
tidb types 代码
文件路径：/br/pkg/lightning/backend/kv/types.go
// Copyright 2021 PingCAP, Inc. Licensed under Apache-2.0.
package kv
import (
"github.com/pingcap/tidb/br/pkg/lightning/log"
"github.com/pingcap/tidb/br/pkg/lightning/verification"
"github.com/pingcap/tidb/types"
)
// Encoder encodes a row of SQL values into some opaque type which can be
// consumed by OpenEngine.WriteEncoded.
type Encoder interface {
// Close the encoder.
Close()
// Encode encodes a row of SQL values into a backend-friendly format.
Encode(
logger log.Logger,
row []types.Datum,
rowID int64,
columnPermutation []int,
path string,
offset int64,
) (Row, error)
}
// Row represents a single encoded row.
type Row interface {
// ClassifyAndAppend separates the data-like and index-like parts of the
// encoded row, and appends these parts into the existing buffers and
// checksums.
ClassifyAndAppend(
data *Rows,
dataChecksum *verification.KVChecksum,
indices *Rows,
indexChecksum *verification.KVChecksum,
)
// Size represents the total kv size of this Row.
Size() uint64
}
// Rows represents a collection of encoded rows.
type Rows interface {
// SplitIntoChunks splits the rows into multiple consecutive parts, each
// part having total byte size less than `splitSize`. The meaning of "byte
// size" should be consistent with the value used in `Row.ClassifyAndAppend`.
SplitIntoChunks(splitSize int) []Rows
// Clear returns a new collection with empty content. It may share the
// capacity with the current instance. The typical usage is `x = x.Clear()`.
Clear() Rows
}
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