// extractKVRanges extracts kv.KeyRanges slice from a SelectRequest, and also returns if it is in descending order.
func (rs *localRegion) extractKVRanges(sel *tipb.SelectRequest) (kvRanges []kv.KeyRange, desc bool) {
var (
tid int64
idxID int64
)
if sel.IndexInfo != nil {
tid = sel.IndexInfo.GetTableId()
idxID = sel.IndexInfo.GetIndexId()
} else {
tid = sel.TableInfo.GetTableId()
}
for _, kran := range sel.Ranges {
var upperKey, lowerKey kv.Key
if idxID == 0 {
upperKey = tablecodec.EncodeRowKey(tid, kran.GetHigh())
if bytes.Compare(upperKey, rs.startKey) <= 0 {
continue
}
lowerKey = tablecodec.EncodeRowKey(tid, kran.GetLow())
} else {
upperKey = tablecodec.EncodeIndexSeekKey(tid, idxID, kran.GetHigh())
if bytes.Compare(upperKey, rs.startKey) <= 0 {
continue
}
lowerKey = tablecodec.EncodeIndexSeekKey(tid, idxID, kran.GetLow())
}
if bytes.Compare(lowerKey, rs.endKey) >= 0 {
break
}
var kvr kv.KeyRange
if bytes.Compare(lowerKey, rs.startKey) <= 0 {
kvr.StartKey = rs.startKey
} else {
kvr.StartKey = lowerKey
}
if bytes.Compare(upperKey, rs.endKey) <= 0 {
kvr.EndKey = upperKey
} else {
kvr.EndKey = rs.endKey
}
kvRanges = append(kvRanges, kvr)
}
if sel.OrderBy != nil {
desc = *sel.OrderBy[0].Desc
}
if desc {
reverseKVRanges(kvRanges)
}
return
}
func setRow(txn kv.Transaction, handle int64, tbl *simpleTableInfo, gen genValueFunc) error {
rowKey := tablecodec.EncodeRowKey(tbl.tID, codec.EncodeInt(nil, handle))
txn.Set(rowKey, []byte(txn.String()))
columnValues := gen(handle, tbl)
for i, v := range columnValues {
cKey, cVal, err := encodeColumnKV(tbl.tID, handle, tbl.cIDs[i], v)
if err != nil {
return errors.Trace(err)
}
err = txn.Set(cKey, cVal)
if err != nil {
return errors.Trace(err)
}
}
for i, idxCol := range tbl.indices {
idxVal := columnValues[idxCol]
encoded, err := codec.EncodeKey(nil, idxVal, types.NewDatum(handle))
if err != nil {
return errors.Trace(err)
}
idxKey := tablecodec.EncodeIndexSeekKey(tbl.tID, tbl.iIDs[i], encoded)
err = txn.Set(idxKey, []byte{0})
if err != nil {
return errors.Trace(err)
}
}
return nil
}
// extractKVRanges extracts kv.KeyRanges slice from a SelectRequest, and also returns if it is in descending order.
func (h *rpcHandler) extractKVRanges(sel *tipb.SelectRequest) (kvRanges []kv.KeyRange, desc bool) {
var (
tid int64
idxID int64
)
if sel.IndexInfo != nil {
tid = sel.IndexInfo.GetTableId()
idxID = sel.IndexInfo.GetIndexId()
} else {
tid = sel.TableInfo.GetTableId()
}
for _, kran := range sel.Ranges {
var upperKey, lowerKey kv.Key
if idxID == 0 {
upperKey = tablecodec.EncodeRowKey(tid, kran.GetHigh())
if bytes.Compare(upperKey, h.startKey) <= 0 {
continue
}
lowerKey = tablecodec.EncodeRowKey(tid, kran.GetLow())
} else {
upperKey = tablecodec.EncodeIndexSeekKey(tid, idxID, kran.GetHigh())
if bytes.Compare(upperKey, h.startKey) <= 0 {
continue
}
lowerKey = tablecodec.EncodeIndexSeekKey(tid, idxID, kran.GetLow())
}
if len(h.endKey) != 0 && bytes.Compare([]byte(lowerKey), h.endKey) >= 0 {
break
}
var kvr kv.KeyRange
kvr.StartKey = kv.Key(maxStartKey(lowerKey, h.startKey))
kvr.EndKey = kv.Key(minEndKey(upperKey, h.endKey))
kvRanges = append(kvRanges, kvr)
}
if sel.OrderBy != nil {
desc = *sel.OrderBy[0].Desc
}
if desc {
reverseKVRanges(kvRanges)
}
return
}
func fullIndexRange(tid int64, idxID int64) kv.KeyRange {
return kv.KeyRange{
StartKey: tablecodec.EncodeIndexSeekKey(tid, idxID, []byte{0}),
EndKey: tablecodec.EncodeIndexSeekKey(tid, idxID, []byte{255}),
}
}