fixed_string bug

[czpmango]

Type Fixed_string is filled with spaces by default but expects an \0.

(czp@nebula) [nba]> create tag fixStrTest(name fixed_string(8))
Execution succeeded (time spent 1048/1284 us)

(czp@nebula) [nba]> insert vertex fixStrTest(name) values "czp":("czp")
Execution succeeded (time spent 1419/1671 us)

(czp@nebula) [nba]> match (v:fixStrTest) where v.name starts with "czp" return v
+----------------------------------+
| v                                |
+----------------------------------+
| ("czp" :fixStrTest{name: "czp"}) |
+----------------------------------+
Got 1 rows (time spent 2708/2931 us)

(czp@nebula) [nba]> match (v:fixStrTest) where v.name == "czp" return v
+---+
| v |
+---+
+---+
Empty set (time spent 2404/2605 us)

[Aiee]

Response from the service:

[czpmango]

Padding \0 after a fixed-length string is correct.