/*
* Convert sorted handle to kv ranges.
* For continuous handles, we should merge them to a single key range.
*/
func tableHandlesToKVRanges(tid int64, handles []int64) []kv.KeyRange {
krs := make([]kv.KeyRange, 0, len(handles))
i := 0
for i < len(handles) {
h := handles[i]
if h == math.MaxInt64 {
// We can't convert MaxInt64 into an left closed, right open range.
i++
continue
}
j := i + 1
endHandle := h + 1
for ; j < len(handles); j++ {
if handles[j] == endHandle {
endHandle = handles[j] + 1
continue
}
break
}
startKey := tablecodec.EncodeRowKeyWithHandle(tid, h)
endKey := tablecodec.EncodeRowKeyWithHandle(tid, endHandle)
krs = append(krs, kv.KeyRange{StartKey: startKey, EndKey: endKey})
i = j
}
return krs
}
func getExpectedRanges(tid int64, hrs []*handleRange) []kv.KeyRange {
krs := make([]kv.KeyRange, 0, len(hrs))
for _, hr := range hrs {
startKey := tablecodec.EncodeRowKeyWithHandle(tid, hr.start)
endKey := tablecodec.EncodeRowKeyWithHandle(tid, hr.end)
krs = append(krs, kv.KeyRange{StartKey: startKey, EndKey: endKey})
}
return krs
}
func tableRangesToKVRanges(tid int64, tableRanges []plan.TableRange) []kv.KeyRange {
krs := make([]kv.KeyRange, 0, len(tableRanges))
for _, tableRange := range tableRanges {
startKey := tablecodec.EncodeRowKeyWithHandle(tid, tableRange.LowVal)
hi := tableRange.HighVal
if hi != math.MaxInt64 {
hi++
}
endKey := tablecodec.EncodeRowKeyWithHandle(tid, hi)
krs = append(krs, kv.KeyRange{StartKey: startKey, EndKey: endKey})
}
return krs
}
// Seek implements table.Table Seek interface.
func (t *Table) Seek(ctx context.Context, h int64) (int64, bool, error) {
seekKey := tablecodec.EncodeRowKeyWithHandle(t.ID, h)
txn, err := ctx.GetTxn(false)
if err != nil {
return 0, false, errors.Trace(err)
}
iter, err := txn.Seek(seekKey)
if !iter.Valid() || !iter.Key().HasPrefix(t.RecordPrefix()) {
// No more records in the table, skip to the end.
return 0, false, nil
}
handle, err := tablecodec.DecodeRowKey(iter.Key())
if err != nil {
return 0, false, errors.Trace(err)
}
return handle, true, nil
}
func (ts *testSuite) TestRowKeyCodec(c *C) {
table := []struct {
tableID int64
h int64
ID int64
}{
{1, 1234567890, 0},
{2, 1, 0},
{3, -1, 0},
{4, -1, 1},
}
for _, t := range table {
b := tablecodec.EncodeRowKeyWithHandle(t.tableID, t.h)
tableID, handle, err := tablecodec.DecodeRecordKey(b)
c.Assert(err, IsNil)
c.Assert(tableID, Equals, t.tableID)
c.Assert(handle, Equals, t.h)
handle, err = tablecodec.DecodeRowKey(b)
c.Assert(err, IsNil)
c.Assert(handle, Equals, t.h)
}
// test error
tbl := []string{
"",
"x",
"t1",
"t12345678",
"t12345678_i",
"t12345678_r1",
"t12345678_r1234567",
}
for _, t := range tbl {
_, err := tablecodec.DecodeRowKey(kv.Key(t))
c.Assert(err, NotNil)
}
}
// Next implements the Executor Next interface.
func (e *SelectLockExec) Next() (*Row, error) {
row, err := e.Src.Next()
if err != nil {
return nil, errors.Trace(err)
}
if row == nil {
return nil, nil
}
if len(row.RowKeys) != 0 && e.Lock == ast.SelectLockForUpdate {
e.ctx.GetSessionVars().TxnCtx.ForUpdate = true
txn, err := e.ctx.GetTxn(false)
if err != nil {
return nil, errors.Trace(err)
}
for _, k := range row.RowKeys {
lockKey := tablecodec.EncodeRowKeyWithHandle(k.Tbl.Meta().ID, k.Handle)
err = txn.LockKeys(lockKey)
if err != nil {
return nil, errors.Trace(err)
}
}
}
return row, nil
}
func (h *rpcHandler) getRowByHandle(ctx *selectContext, handle int64) (*tipb.Row, error) {
tid := ctx.sel.TableInfo.GetTableId()
columns := ctx.sel.TableInfo.Columns
row := new(tipb.Row)
var d types.Datum
d.SetInt64(handle)
var err error
row.Handle, err = codec.EncodeValue(nil, d)
if err != nil {
return nil, errors.Trace(err)
}
rowData := make([][]byte, len(columns))
colTps := make(map[int64]*types.FieldType, len(columns))
for i, col := range columns {
var colVal []byte
if col.GetPkHandle() {
if mysql.HasUnsignedFlag(uint(*col.Flag)) {
// PK column is Unsigned
var ud types.Datum
ud.SetUint64(uint64(handle))
var err1 error
colVal, err1 = codec.EncodeValue(nil, ud)
if err1 != nil {
return nil, errors.Trace(err1)
}
} else {
colVal = row.Handle
}
rowData[i] = colVal
} else {
colTps[col.GetColumnId()] = xapi.FieldTypeFromPBColumn(col)
}
}
key := tablecodec.EncodeRowKeyWithHandle(tid, handle)
value, err := h.mvccStore.Get(key, ctx.sel.GetStartTs())
if err != nil {
return nil, errors.Trace(err)
}
values, err := h.getRowData(value, colTps)
if err != nil {
return nil, errors.Trace(err)
}
for i, col := range columns {
if col.GetPkHandle() {
continue
}
v, ok := values[col.GetColumnId()]
if !ok {
if mysql.HasNotNullFlag(uint(col.GetFlag())) {
return nil, errors.New("Miss column")
}
v = []byte{codec.NilFlag}
values[col.GetColumnId()] = v
}
rowData[i] = v
}
// Evalue where
match, err := h.evalWhereForRow(ctx, handle, values)
if err != nil {
return nil, errors.Trace(err)
}
if !match {
return nil, nil
}
for _, d := range rowData {
row.Data = append(row.Data, d...)
}
return row, nil
}
