rowcodec

Documentation

Index

• Constants
• func IsNewFormat(rowData []byte) bool
• func IsRowKey(key []byte) bool
• func NewDecoder(columns []ColInfo, handleColID int64, loc *time.Location) *decoder
• type BytesDecoder
  • func NewByteDecoder(columns []ColInfo, handleColID int64, defBytes func(i int) ([]byte, error), ...) *BytesDecoder
  • func (decoder *BytesDecoder) DecodeToBytes(outputOffset map[int64]int, handle int64, value []byte, cacheBytes []byte) ([][]byte, error)
  • func (decoder *BytesDecoder) DecodeToBytesNoHandle(outputOffset map[int64]int, value []byte) ([][]byte, error)
• type ChunkDecoder
  • func NewChunkDecoder(columns []ColInfo, handleColID int64, ...) *ChunkDecoder
  • func (decoder *ChunkDecoder) DecodeToChunk(rowData []byte, handle int64, chk *chunk.Chunk) error
• type ColInfo
• type DatumMapDecoder
  • func NewDatumMapDecoder(columns []ColInfo, handleColID int64, loc *time.Location) *DatumMapDecoder
  • func (decoder *DatumMapDecoder) DecodeToDatumMap(rowData []byte, handle int64, row map[int64]types.Datum) (map[int64]types.Datum, error)
• type Encoder
  • func (r *Encoder) ColumnIsNull(rowData []byte, colID int64, defaultVal []byte) (bool, error)
  • func (encoder *Encoder) Encode(sc *stmtctx.StatementContext, colIDs []int64, values []types.Datum, buf []byte) ([]byte, error)

Constants

const (
	NilFlag          byte = 0
	BytesFlag        byte = 1
	CompactBytesFlag byte = 2
	IntFlag          byte = 3
	UintFlag         byte = 4
	FloatFlag        byte = 5
	DecimalFlag      byte = 6
	VarintFlag       byte = 8
	VaruintFlag      byte = 9
	JSONFlag         byte = 10
)

First byte in the encoded value which specifies the encoding type.

const CodecVer = 128

CodecVer is the constant number that represent the new row format.

Functions

func IsNewFormat

func IsNewFormat(rowData []byte) bool

IsNewFormat checks whether row data is in new-format.

func IsRowKey

func IsRowKey(key []byte) bool

IsRowKey determine whether key is row key. this method will be used in unistore.

func NewDecoder

func NewDecoder(columns []ColInfo, handleColID int64, loc *time.Location) *decoder

NewDecoder creates a decoder.

Types

type BytesDecoder

type BytesDecoder struct {
	// contains filtered or unexported fields
}

BytesDecoder decodes the row to old datums bytes.

func NewByteDecoder

func NewByteDecoder(columns []ColInfo, handleColID int64, defBytes func(i int) ([]byte, error), loc *time.Location) *BytesDecoder

NewByteDecoder creates a BytesDecoder. defBytes: provided default value bytes in old datum format(flag+colData).

func (*BytesDecoder) DecodeToBytes

func (decoder *BytesDecoder) DecodeToBytes(outputOffset map[int64]int, handle int64, value []byte, cacheBytes []byte) ([][]byte, error)

DecodeToBytes decodes raw byte slice to row data.

func (*BytesDecoder) DecodeToBytesNoHandle

func (decoder *BytesDecoder) DecodeToBytesNoHandle(outputOffset map[int64]int, value []byte) ([][]byte, error)

DecodeToBytesNoHandle decodes raw byte slice to row dat without handle.

type ChunkDecoder

type ChunkDecoder struct {
	// contains filtered or unexported fields
}

ChunkDecoder decodes the row to chunk.Chunk.

func NewChunkDecoder

func NewChunkDecoder(columns []ColInfo, handleColID int64, defDatum func(i int, chk *chunk.Chunk) error, loc *time.Location) *ChunkDecoder

NewChunkDecoder creates a NewChunkDecoder.

func (*ChunkDecoder) DecodeToChunk

func (decoder *ChunkDecoder) DecodeToChunk(rowData []byte, handle int64, chk *chunk.Chunk) error

DecodeToChunk decodes a row to chunk.

type ColInfo

type ColInfo struct {
	ID         int64
	Tp         int32
	Flag       int32
	IsPKHandle bool

	Flen          int
	Decimal       int
	Elems         []string
	Collate       string
	VirtualGenCol bool
}

ColInfo is used as column meta info for row decoder.

type DatumMapDecoder

type DatumMapDecoder struct {
	// contains filtered or unexported fields
}

DatumMapDecoder decodes the row to datum map.

func NewDatumMapDecoder

func NewDatumMapDecoder(columns []ColInfo, handleColID int64, loc *time.Location) *DatumMapDecoder

NewDatumMapDecoder creates a DatumMapDecoder.

func (*DatumMapDecoder) DecodeToDatumMap

func (decoder *DatumMapDecoder) DecodeToDatumMap(rowData []byte, handle int64, row map[int64]types.Datum) (map[int64]types.Datum, error)

DecodeToDatumMap decodes byte slices to datum map.

type Encoder

type Encoder struct {

	// Enable indicates whether this encoder should be use.
	Enable bool
	// contains filtered or unexported fields
}

Encoder is used to encode a row.

func (*Encoder) ColumnIsNull

func (r *Encoder) ColumnIsNull(rowData []byte, colID int64, defaultVal []byte) (bool, error)

ColumnIsNull returns if the column value is null. Mainly used for count column aggregation. this method will used in unistore.

func (*Encoder) Encode

func (encoder *Encoder) Encode(sc *stmtctx.StatementContext, colIDs []int64, values []types.Datum, buf []byte) ([]byte, error)

Encode encodes a row from a datums slice.