[BUG] LPA failed on graph with 'string' OID

[lidongze0629]

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To Reproduce

Expected behavior A clear and concise description of what you expected to happen.

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Environment (please complete the following information):

• GraphScope version: [e.g., v0.1, v0.2.2, master]
• OS: [e.g. MacOS, Linux]
• Version [e.g. 10.15]
• Kubernetes Version [e.g., 1.19]

Additional context Add any other context about the problem here.