*: fix key prefix.

table/tables/tables.go

@@ -49,7 +49,9 @@ type Table struct {
 	writableColumns []*column.Col
 	indices         []*column.IndexedCol
 	recordPrefix    string
+	encRecordPrefix []byte
 	indexPrefix     string
+	encIndexPrefix  []byte
 	alloc           autoid.Allocator
 	state           model.SchemaState
 }
@@ -101,6 +103,9 @@ func NewTable(tableID int64, tableName string, cols []*column.Col, alloc autoid.
 		state:        model.StatePublic,
 	}
 
+	t.encRecordPrefix, _ = kv.EncodeValue(t.recordPrefix)
+	t.encIndexPrefix, _ = kv.EncodeValue(t.indexPrefix)
+
 	t.publicColumns = t.Cols()
 	t.writableColumns = t.writableCols()
 	return t
@@ -237,20 +242,20 @@ func (t *Table) flatten(data interface{}) (interface{}, error) {
 
 // KeyPrefix implements table.Table KeyPrefix interface.
 func (t *Table) KeyPrefix() string {
-	return t.recordPrefix
+	return string(t.encRecordPrefix)
 }
 
 // IndexPrefix implements table.Table IndexPrefix interface.
 func (t *Table) IndexPrefix() string {
-	return t.indexPrefix
+	return string(t.encRecordPrefix)
 }
 
 // RecordKey implements table.Table RecordKey interface.
 func (t *Table) RecordKey(h int64, col *column.Col) []byte {
 	if col != nil {
-		return util.EncodeRecordKey(t.KeyPrefix(), h, col.ID)
+		return util.EncodeRecordKey(t.recordPrefix, h, col.ID)
 	}
-	return util.EncodeRecordKey(t.KeyPrefix(), h, 0)
+	return util.EncodeRecordKey(t.recordPrefix, h, 0)
 }
 
 // FirstKey implements table.Table FirstKey interface.

util/codec/bytes.go

@@ -28,7 +28,6 @@ const (
 	encPad           = byte(0x0)
 )
 
-// Refer: https://github.com/facebook/mysql-5.6/wiki/MyRocks-record-format#memcomparable-format
 // EncodeBytes guarantees the encoded value is in ascending order for comparison,
 // encoding with the following rule:
 //  [group1][marker1]...[groupN][markerN]
@@ -39,6 +38,7 @@ const (
 //   [1, 2, 3] -> [1 1 2 3 0 0 0 0 0 250]
 //   [1, 2, 3, 0] -> [1 1 2 3 0 0 0 0 0 251]
 //   [1, 2, 3, 4, 5, 6, 7, 8] -> [1 1 2 3 4 5 6 7 8 255 0 0 0 0 0 0 0 0 247]
+// Refer: https://github.com/facebook/mysql-5.6/wiki/MyRocks-record-format#memcomparable-format
 func EncodeBytes(b []byte, data []byte) []byte {
 	// Allocate more space to avoid unnecessary slice growing.
 	// Assume that the byte slice size is about 20*8 = 160 bytes.