codec: Don't convert set or enum datum to float64 (pingcap#32372)

close pingcap#32302

util/codec/codec.go

@@ -159,9 +159,9 @@ func EstimateValueSize(sc *stmtctx.StatementContext, val types.Datum) (int, erro
 	case types.KindMysqlDecimal:
 		l = valueSizeOfDecimal(val.GetMysqlDecimal(), val.Length(), val.Frac()) + 1
 	case types.KindMysqlEnum:
-		l = valueSizeOfUnsignedInt(uint64(val.GetMysqlEnum().ToNumber()))
+		l = valueSizeOfUnsignedInt(val.GetMysqlEnum().Value)
 	case types.KindMysqlSet:
-		l = valueSizeOfUnsignedInt(uint64(val.GetMysqlSet().ToNumber()))
+		l = valueSizeOfUnsignedInt(val.GetMysqlSet().Value)
 	case types.KindMysqlBit, types.KindBinaryLiteral:
 		val, err := val.GetBinaryLiteral().ToInt(sc)
 		terror.Log(errors.Trace(err))
@@ -355,11 +355,11 @@ func encodeHashChunkRowIdx(sc *stmtctx.StatementContext, row chunk.Row, tp *type
 	case mysql.TypeEnum:
 		if mysql.HasEnumSetAsIntFlag(tp.Flag) {
 			flag = uvarintFlag
-			v := uint64(row.GetEnum(idx).ToNumber())
+			v := row.GetEnum(idx).Value
 			b = (*[sizeUint64]byte)(unsafe.Pointer(&v))[:]
 		} else {
 			flag = compactBytesFlag
-			v := uint64(row.GetEnum(idx).ToNumber())
+			v := row.GetEnum(idx).Value
 			str := ""
 			if enum, err := types.ParseEnumValue(tp.Elems, v); err == nil {
 				// str will be empty string if v out of definition of enum.
@@ -570,11 +570,11 @@ func HashChunkSelected(sc *stmtctx.StatementContext, h []hash.Hash64, chk *chunk
 				isNull[i] = !ignoreNull
 			} else if mysql.HasEnumSetAsIntFlag(tp.Flag) {
 				buf[0] = uvarintFlag
-				v := uint64(column.GetEnum(i).ToNumber())
+				v := column.GetEnum(i).Value
 				b = (*[sizeUint64]byte)(unsafe.Pointer(&v))[:]
 			} else {
 				buf[0] = compactBytesFlag
-				v := uint64(column.GetEnum(i).ToNumber())
+				v := column.GetEnum(i).Value
 				str := ""
 				if enum, err := types.ParseEnumValue(tp.Elems, v); err == nil {
 					// str will be empty string if v out of definition of enum.
@@ -1326,9 +1326,9 @@ func HashCode(b []byte, d types.Datum) []byte {
 		decStr := d.GetMysqlDecimal().ToString()
 		b = encodeBytes(b, decStr, false)
 	case types.KindMysqlEnum:
-		b = encodeUnsignedInt(b, uint64(d.GetMysqlEnum().ToNumber()), false)
+		b = encodeUnsignedInt(b, d.GetMysqlEnum().Value, false)
 	case types.KindMysqlSet:
-		b = encodeUnsignedInt(b, uint64(d.GetMysqlSet().ToNumber()), false)
+		b = encodeUnsignedInt(b, d.GetMysqlSet().Value, false)
 	case types.KindMysqlBit, types.KindBinaryLiteral:
 		val := d.GetBinaryLiteral()
 		b = encodeBytes(b, val, false)