V3.8 执行lookup 语句使用start with "" 时会导致graph 退出

[mosesyu95]

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Describe the bug (required)

LOOKUP ON model WHERE model.name STARTS WITH "" YIELD id(vertex) as vid
执行这条语句会导致graph退出，
nebula-graphd.service: main process exited, code=killed, status=11/SEGV

Your Environments (required)

• OS: linux
• Compiler: g++ (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44)
  Copyright (C) 2015 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions. There is NO
  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
• CPU: lscpu
  Architecture: x86_64
  CPU op-mode(s): 32-bit, 64-bit
  Byte Order: Little Endian
  CPU(s): 4
  On-line CPU(s) list: 0-3
  Thread(s) per core: 2
  Core(s) per socket: 2
  Socket(s): 1
  NUMA node(s): 1
  Vendor ID: GenuineIntel
  CPU family: 6
  Model: 85
  Model name: Intel(R) Xeon(R) Platinum 8269CY CPU @ 2.50GHz
  Stepping: 7
  CPU MHz: 2500.002
  BogoMIPS: 5000.00
  Hypervisor vendor: KVM
  Virtualization type: full
  L1d cache: 32K
  L1i cache: 32K
  L2 cache: 1024K
  L3 cache: 36608K
  NUMA node0 CPU(s): 0-3
  Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc eagerfpu pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 arat avx512_vnni
• Commit id (e.g. a3ffc7d8)
• 发布版v3.8