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chunk.go
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// Copyright 2017 PingCAP, Inc.
//
// Licensed 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package chunk
import (
"encoding/binary"
"unsafe"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/types/json"
"github.com/pingcap/tidb/util/hack"
)
var _ types.Row = Row{}
// Chunk stores multiple rows of data in Apache Arrow format.
// See https://arrow.apache.org/docs/memory_layout.html
// Values are appended in compact format and can be directly accessed without decoding.
// When the chunk is done processing, we can reuse the allocated memory by resetting it.
type Chunk struct {
columns []*column
// numVirtualRows indicates the number of virtual rows, witch have zero columns.
// It is used only when this Chunk doesn't hold any data, i.e. "len(columns)==0".
numVirtualRows int
}
// Capacity constants.
const (
InitialCapacity = 32
)
// NewChunk creates a new chunk with field types.
func NewChunk(fields []*types.FieldType) *Chunk {
return NewChunkWithCapacity(fields, InitialCapacity)
}
// NewChunkWithCapacity creates a new chunk with field types and capacity.
func NewChunkWithCapacity(fields []*types.FieldType, cap int) *Chunk {
chk := new(Chunk)
chk.columns = make([]*column, 0, len(fields))
chk.numVirtualRows = 0
for _, f := range fields {
chk.addColumnByFieldType(f, cap)
}
return chk
}
// MemoryUsage returns the total memory usage of a Chunk in B.
// We ignore the size of column.length and column.nullCount
// since they have little effect of the total memory usage.
func (c *Chunk) MemoryUsage() (sum int64) {
for _, col := range c.columns {
curColMemUsage := int64(unsafe.Sizeof(*col)) + int64(cap(col.nullBitmap)) + int64(cap(col.offsets)*4) + int64(cap(col.data)) + int64(cap(col.elemBuf))
sum += curColMemUsage
}
return
}
// addFixedLenColumn adds a fixed length column with elemLen and initial data capacity.
func (c *Chunk) addFixedLenColumn(elemLen, initCap int) {
c.columns = append(c.columns, &column{
elemBuf: make([]byte, elemLen),
data: make([]byte, 0, initCap*elemLen),
nullBitmap: make([]byte, 0, initCap>>3),
})
}
// addVarLenColumn adds a variable length column with initial data capacity.
func (c *Chunk) addVarLenColumn(initCap int) {
c.columns = append(c.columns, &column{
offsets: make([]int32, 1, initCap+1),
data: make([]byte, 0, initCap*4),
nullBitmap: make([]byte, 0, initCap>>3),
})
}
// addColumnByFieldType adds a column by field type.
func (c *Chunk) addColumnByFieldType(fieldTp *types.FieldType, initCap int) {
switch fieldTp.Tp {
case mysql.TypeFloat:
c.addFixedLenColumn(4, initCap)
case mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong,
mysql.TypeDouble, mysql.TypeYear:
c.addFixedLenColumn(8, initCap)
case mysql.TypeDuration:
c.addFixedLenColumn(16, initCap)
case mysql.TypeNewDecimal:
c.addFixedLenColumn(types.MyDecimalStructSize, initCap)
case mysql.TypeDate, mysql.TypeDatetime, mysql.TypeTimestamp:
c.addFixedLenColumn(16, initCap)
default:
c.addVarLenColumn(initCap)
}
}
// MakeRef makes column in "dstColIdx" reference to column in "srcColIdx".
func (c *Chunk) MakeRef(srcColIdx, dstColIdx int) {
c.columns[dstColIdx] = c.columns[srcColIdx]
}
// SwapColumn swaps column "c.columns[colIdx]" with column "other.columns[otherIdx]".
func (c *Chunk) SwapColumn(colIdx int, other *Chunk, otherIdx int) {
c.columns[colIdx], other.columns[otherIdx] = other.columns[otherIdx], c.columns[colIdx]
}
// SwapColumns swaps columns with another Chunk.
func (c *Chunk) SwapColumns(other *Chunk) {
c.columns, other.columns = other.columns, c.columns
c.numVirtualRows, other.numVirtualRows = other.numVirtualRows, c.numVirtualRows
}
// SetNumVirtualRows sets the virtual row number for a Chunk.
// It should only be used when there exists no column in the Chunk.
func (c *Chunk) SetNumVirtualRows(numVirtualRows int) {
c.numVirtualRows = numVirtualRows
}
// Reset resets the chunk, so the memory it allocated can be reused.
// Make sure all the data in the chunk is not used anymore before you reuse this chunk.
func (c *Chunk) Reset() {
for _, c := range c.columns {
c.reset()
}
c.numVirtualRows = 0
}
// NumCols returns the number of columns in the chunk.
func (c *Chunk) NumCols() int {
return len(c.columns)
}
// NumRows returns the number of rows in the chunk.
func (c *Chunk) NumRows() int {
if c.NumCols() == 0 {
return c.numVirtualRows
}
return c.columns[0].length
}
// GetRow gets the Row in the chunk with the row index.
func (c *Chunk) GetRow(idx int) Row {
return Row{c: c, idx: idx}
}
// AppendRow appends a row to the chunk.
func (c *Chunk) AppendRow(row Row) {
c.AppendPartialRow(0, row)
c.numVirtualRows++
}
// AppendPartialRow appends a row to the chunk.
func (c *Chunk) AppendPartialRow(colIdx int, row Row) {
for i, rowCol := range row.c.columns {
chkCol := c.columns[colIdx+i]
chkCol.appendNullBitmap(!rowCol.isNull(row.idx))
if rowCol.isFixed() {
elemLen := len(rowCol.elemBuf)
offset := row.idx * elemLen
chkCol.data = append(chkCol.data, rowCol.data[offset:offset+elemLen]...)
} else {
start, end := rowCol.offsets[row.idx], rowCol.offsets[row.idx+1]
chkCol.data = append(chkCol.data, rowCol.data[start:end]...)
chkCol.offsets = append(chkCol.offsets, int32(len(chkCol.data)))
}
chkCol.length++
}
}
// Append appends rows in [begin, end) in another Chunk to a Chunk.
func (c *Chunk) Append(other *Chunk, begin, end int) {
for colID, src := range other.columns {
dst := c.columns[colID]
if src.isFixed() {
elemLen := len(src.elemBuf)
dst.data = append(dst.data, src.data[begin*elemLen:end*elemLen]...)
} else {
beginOffset, endOffset := src.offsets[begin], src.offsets[end]
dst.data = append(dst.data, src.data[beginOffset:endOffset]...)
for i := begin; i < end; i++ {
dst.offsets = append(dst.offsets, dst.offsets[len(dst.offsets)-1]+src.offsets[i+1]-src.offsets[i])
}
}
for i := begin; i < end; i++ {
dst.appendNullBitmap(!src.isNull(i))
dst.length++
}
}
c.numVirtualRows += end - begin
}
// TruncateTo truncates rows from tail to head in a Chunk to "numRows" rows.
func (c *Chunk) TruncateTo(numRows int) {
for _, col := range c.columns {
if col.isFixed() {
elemLen := len(col.elemBuf)
col.data = col.data[:numRows*elemLen]
} else {
col.data = col.data[:col.offsets[numRows]]
col.offsets = col.offsets[:numRows+1]
}
for i := numRows; i < col.length; i++ {
if col.isNull(i) {
col.nullCount--
}
}
col.length = numRows
col.nullBitmap = col.nullBitmap[:(col.length>>3)+1]
}
c.numVirtualRows = numRows
}
// AppendNull appends a null value to the chunk.
func (c *Chunk) AppendNull(colIdx int) {
c.columns[colIdx].appendNull()
}
// AppendInt64 appends a int64 value to the chunk.
func (c *Chunk) AppendInt64(colIdx int, i int64) {
c.columns[colIdx].appendInt64(i)
}
// AppendUint64 appends a uint64 value to the chunk.
func (c *Chunk) AppendUint64(colIdx int, u uint64) {
c.columns[colIdx].appendUint64(u)
}
// AppendFloat32 appends a float32 value to the chunk.
func (c *Chunk) AppendFloat32(colIdx int, f float32) {
c.columns[colIdx].appendFloat32(f)
}
// AppendFloat64 appends a float64 value to the chunk.
func (c *Chunk) AppendFloat64(colIdx int, f float64) {
c.columns[colIdx].appendFloat64(f)
}
// AppendString appends a string value to the chunk.
func (c *Chunk) AppendString(colIdx int, str string) {
c.columns[colIdx].appendString(str)
}
// AppendBytes appends a bytes value to the chunk.
func (c *Chunk) AppendBytes(colIdx int, b []byte) {
c.columns[colIdx].appendBytes(b)
}
// AppendTime appends a Time value to the chunk.
// TODO: change the time structure so it can be directly written to memory.
func (c *Chunk) AppendTime(colIdx int, t types.Time) {
c.columns[colIdx].appendTime(t)
}
// AppendDuration appends a Duration value to the chunk.
func (c *Chunk) AppendDuration(colIdx int, dur types.Duration) {
c.columns[colIdx].appendDuration(dur)
}
// AppendMyDecimal appends a MyDecimal value to the chunk.
func (c *Chunk) AppendMyDecimal(colIdx int, dec *types.MyDecimal) {
c.columns[colIdx].appendMyDecimal(dec)
}
// AppendEnum appends an Enum value to the chunk.
func (c *Chunk) AppendEnum(colIdx int, enum types.Enum) {
c.columns[colIdx].appendNameValue(enum.Name, enum.Value)
}
// AppendSet appends a Set value to the chunk.
func (c *Chunk) AppendSet(colIdx int, set types.Set) {
c.columns[colIdx].appendNameValue(set.Name, set.Value)
}
// AppendJSON appends a JSON value to the chunk.
func (c *Chunk) AppendJSON(colIdx int, j json.BinaryJSON) {
c.columns[colIdx].appendJSON(j)
}
// AppendDatum appends a datum into the chunk.
func (c *Chunk) AppendDatum(colIdx int, d *types.Datum) {
switch d.Kind() {
case types.KindNull:
c.AppendNull(colIdx)
case types.KindInt64:
c.AppendInt64(colIdx, d.GetInt64())
case types.KindUint64:
c.AppendUint64(colIdx, d.GetUint64())
case types.KindFloat32:
c.AppendFloat32(colIdx, d.GetFloat32())
case types.KindFloat64:
c.AppendFloat64(colIdx, d.GetFloat64())
case types.KindString, types.KindBytes, types.KindBinaryLiteral, types.KindRaw, types.KindMysqlBit:
c.AppendBytes(colIdx, d.GetBytes())
case types.KindMysqlDecimal:
c.AppendMyDecimal(colIdx, d.GetMysqlDecimal())
case types.KindMysqlDuration:
c.AppendDuration(colIdx, d.GetMysqlDuration())
case types.KindMysqlEnum:
c.AppendEnum(colIdx, d.GetMysqlEnum())
case types.KindMysqlSet:
c.AppendSet(colIdx, d.GetMysqlSet())
case types.KindMysqlTime:
c.AppendTime(colIdx, d.GetMysqlTime())
case types.KindMysqlJSON:
c.AppendJSON(colIdx, d.GetMysqlJSON())
}
}
type column struct {
length int
nullCount int
nullBitmap []byte
offsets []int32
data []byte
elemBuf []byte
}
func (c *column) isFixed() bool {
return c.elemBuf != nil
}
func (c *column) reset() {
c.length = 0
c.nullCount = 0
c.nullBitmap = c.nullBitmap[:0]
if len(c.offsets) > 0 {
// The first offset is always 0, it makes slicing the data easier, we need to keep it.
c.offsets = c.offsets[:1]
}
c.data = c.data[:0]
}
func (c *column) isNull(rowIdx int) bool {
nullByte := c.nullBitmap[rowIdx/8]
return nullByte&(1<<(uint(rowIdx)&7)) == 0
}
func (c *column) appendNullBitmap(on bool) {
idx := c.length >> 3
if idx >= len(c.nullBitmap) {
c.nullBitmap = append(c.nullBitmap, 0)
}
if on {
pos := uint(c.length) & 7
c.nullBitmap[idx] |= byte(1 << pos)
} else {
c.nullCount++
}
}
func (c *column) appendNull() {
c.appendNullBitmap(false)
if c.isFixed() {
c.data = append(c.data, c.elemBuf...)
} else {
c.offsets = append(c.offsets, c.offsets[c.length])
}
c.length++
}
func (c *column) finishAppendFixed() {
c.data = append(c.data, c.elemBuf...)
c.appendNullBitmap(true)
c.length++
}
func (c *column) appendInt64(i int64) {
*(*int64)(unsafe.Pointer(&c.elemBuf[0])) = i
c.finishAppendFixed()
}
func (c *column) appendUint64(u uint64) {
*(*uint64)(unsafe.Pointer(&c.elemBuf[0])) = u
c.finishAppendFixed()
}
func (c *column) appendFloat32(f float32) {
*(*float32)(unsafe.Pointer(&c.elemBuf[0])) = f
c.finishAppendFixed()
}
func (c *column) appendFloat64(f float64) {
*(*float64)(unsafe.Pointer(&c.elemBuf[0])) = f
c.finishAppendFixed()
}
func (c *column) finishAppendVar() {
c.appendNullBitmap(true)
c.offsets = append(c.offsets, int32(len(c.data)))
c.length++
}
func (c *column) appendString(str string) {
c.data = append(c.data, str...)
c.finishAppendVar()
}
func (c *column) appendBytes(b []byte) {
c.data = append(c.data, b...)
c.finishAppendVar()
}
func (c *column) appendTime(t types.Time) {
writeTime(c.elemBuf, t)
c.finishAppendFixed()
}
func writeTime(buf []byte, t types.Time) {
binary.BigEndian.PutUint16(buf, uint16(t.Time.Year()))
buf[2] = uint8(t.Time.Month())
buf[3] = uint8(t.Time.Day())
buf[4] = uint8(t.Time.Hour())
buf[5] = uint8(t.Time.Minute())
buf[6] = uint8(t.Time.Second())
binary.BigEndian.PutUint32(buf[8:], uint32(t.Time.Microsecond()))
buf[12] = t.Type
buf[13] = uint8(t.Fsp)
}
func (c *column) appendDuration(dur types.Duration) {
*(*types.Duration)(unsafe.Pointer(&c.elemBuf[0])) = dur
c.finishAppendFixed()
}
func (c *column) appendMyDecimal(dec *types.MyDecimal) {
*(*types.MyDecimal)(unsafe.Pointer(&c.elemBuf[0])) = *dec
c.finishAppendFixed()
}
func (c *column) appendNameValue(name string, val uint64) {
var buf [8]byte
*(*uint64)(unsafe.Pointer(&buf[0])) = val
c.data = append(c.data, buf[:]...)
c.data = append(c.data, name...)
c.finishAppendVar()
}
func (c *column) appendJSON(j json.BinaryJSON) {
c.data = append(c.data, j.TypeCode)
c.data = append(c.data, j.Value...)
c.finishAppendVar()
}
// Row represents a row of data, can be used to assess values.
type Row struct {
c *Chunk
idx int
}
// Idx returns the row index of Chunk.
func (r Row) Idx() int {
return r.idx
}
// Len returns the number of values in the row.
func (r Row) Len() int {
return r.c.NumCols()
}
// GetInt64 returns the int64 value with the colIdx.
func (r Row) GetInt64(colIdx int) int64 {
col := r.c.columns[colIdx]
return *(*int64)(unsafe.Pointer(&col.data[r.idx*8]))
}
// GetUint64 returns the uint64 value with the colIdx.
func (r Row) GetUint64(colIdx int) uint64 {
col := r.c.columns[colIdx]
return *(*uint64)(unsafe.Pointer(&col.data[r.idx*8]))
}
// GetFloat32 returns the float32 value with the colIdx.
func (r Row) GetFloat32(colIdx int) float32 {
col := r.c.columns[colIdx]
return *(*float32)(unsafe.Pointer(&col.data[r.idx*4]))
}
// GetFloat64 returns the float64 value with the colIdx.
func (r Row) GetFloat64(colIdx int) float64 {
col := r.c.columns[colIdx]
return *(*float64)(unsafe.Pointer(&col.data[r.idx*8]))
}
// GetString returns the string value with the colIdx.
func (r Row) GetString(colIdx int) string {
col := r.c.columns[colIdx]
start, end := col.offsets[r.idx], col.offsets[r.idx+1]
return hack.String(col.data[start:end])
}
// GetBytes returns the bytes value with the colIdx.
func (r Row) GetBytes(colIdx int) []byte {
col := r.c.columns[colIdx]
start, end := col.offsets[r.idx], col.offsets[r.idx+1]
return col.data[start:end]
}
// GetTime returns the Time value with the colIdx.
// TODO: use Time structure directly.
func (r Row) GetTime(colIdx int) types.Time {
col := r.c.columns[colIdx]
return readTime(col.data[r.idx*16:])
}
func readTime(buf []byte) types.Time {
year := int(binary.BigEndian.Uint16(buf))
month := int(buf[2])
day := int(buf[3])
hour := int(buf[4])
minute := int(buf[5])
second := int(buf[6])
microseconds := int(binary.BigEndian.Uint32(buf[8:]))
tp := buf[12]
fsp := int(buf[13])
return types.Time{
Time: types.FromDate(year, month, day, hour, minute, second, microseconds),
Type: tp,
Fsp: fsp,
}
}
// GetDuration returns the Duration value with the colIdx.
func (r Row) GetDuration(colIdx int) types.Duration {
col := r.c.columns[colIdx]
return *(*types.Duration)(unsafe.Pointer(&col.data[r.idx*16]))
}
func (r Row) getNameValue(colIdx int) (string, uint64) {
col := r.c.columns[colIdx]
start, end := col.offsets[r.idx], col.offsets[r.idx+1]
if start == end {
return "", 0
}
val := *(*uint64)(unsafe.Pointer(&col.data[start]))
name := hack.String(col.data[start+8 : end])
return name, val
}
// GetEnum returns the Enum value with the colIdx.
func (r Row) GetEnum(colIdx int) types.Enum {
name, val := r.getNameValue(colIdx)
return types.Enum{Name: name, Value: val}
}
// GetSet returns the Set value with the colIdx.
func (r Row) GetSet(colIdx int) types.Set {
name, val := r.getNameValue(colIdx)
return types.Set{Name: name, Value: val}
}
// GetMyDecimal returns the MyDecimal value with the colIdx.
func (r Row) GetMyDecimal(colIdx int) *types.MyDecimal {
col := r.c.columns[colIdx]
return (*types.MyDecimal)(unsafe.Pointer(&col.data[r.idx*types.MyDecimalStructSize]))
}
// GetJSON returns the JSON value with the colIdx.
func (r Row) GetJSON(colIdx int) json.BinaryJSON {
col := r.c.columns[colIdx]
start, end := col.offsets[r.idx], col.offsets[r.idx+1]
return json.BinaryJSON{TypeCode: col.data[start], Value: col.data[start+1 : end]}
}
// GetDatumRow converts chunk.Row to types.DatumRow.
// Keep in mind that GetDatumRow has a reference to r.c, which is a chunk,
// this function works only if the underlying chunk is valid or unchanged.
func (r Row) GetDatumRow(fields []*types.FieldType) types.DatumRow {
datumRow := make(types.DatumRow, 0, r.c.NumCols())
for colIdx := 0; colIdx < r.c.NumCols(); colIdx++ {
datum := r.GetDatum(colIdx, fields[colIdx])
datumRow = append(datumRow, datum)
}
return datumRow
}
// GetDatum implements the types.Row interface.
func (r Row) GetDatum(colIdx int, tp *types.FieldType) types.Datum {
var d types.Datum
switch tp.Tp {
case mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong, mysql.TypeYear:
if !r.IsNull(colIdx) {
if mysql.HasUnsignedFlag(tp.Flag) {
d.SetUint64(r.GetUint64(colIdx))
} else {
d.SetInt64(r.GetInt64(colIdx))
}
}
case mysql.TypeFloat:
if !r.IsNull(colIdx) {
d.SetFloat32(r.GetFloat32(colIdx))
}
case mysql.TypeDouble:
if !r.IsNull(colIdx) {
d.SetFloat64(r.GetFloat64(colIdx))
}
case mysql.TypeVarchar, mysql.TypeVarString, mysql.TypeString,
mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob:
if !r.IsNull(colIdx) {
d.SetBytes(r.GetBytes(colIdx))
}
case mysql.TypeDate, mysql.TypeDatetime, mysql.TypeTimestamp:
if !r.IsNull(colIdx) {
d.SetMysqlTime(r.GetTime(colIdx))
}
case mysql.TypeDuration:
if !r.IsNull(colIdx) {
d.SetMysqlDuration(r.GetDuration(colIdx))
}
case mysql.TypeNewDecimal:
if !r.IsNull(colIdx) {
d.SetMysqlDecimal(r.GetMyDecimal(colIdx))
d.SetLength(tp.Flen)
d.SetFrac(tp.Decimal)
}
case mysql.TypeEnum:
if !r.IsNull(colIdx) {
d.SetMysqlEnum(r.GetEnum(colIdx))
}
case mysql.TypeSet:
if !r.IsNull(colIdx) {
d.SetMysqlSet(r.GetSet(colIdx))
}
case mysql.TypeBit:
if !r.IsNull(colIdx) {
d.SetMysqlBit(r.GetBytes(colIdx))
}
case mysql.TypeJSON:
if !r.IsNull(colIdx) {
d.SetMysqlJSON(r.GetJSON(colIdx))
}
}
return d
}
// IsNull implements the types.Row interface.
func (r Row) IsNull(colIdx int) bool {
return r.c.columns[colIdx].isNull(r.idx)
}