Piped fetch clause failed reporting error on legal input

[kikimo]

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Describe the bug (must be provided)

A clear and concise description of what the bug is.

Your Environments (must be provided)

• OS: Linux vince.wu-53 3.10.0-1160.36.2.el7.x86_64 Parser framework #1 SMP Wed Jul 21 11:57:15 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
• Compliler: cmake version 3.15.5, g++ (Nebula Graph Build) 7.5.0
• CPU: Intel(R) Xeon(R) Platinum 8260 CPU @ 2.30GHz
• Commit id v2-nightly

How To Reproduce(must be provided)

Steps to reproduce the behavior:

Expected behavior

Piped fetch clause should yield correct result.

Additional context

Provide logs and configs, or any other context to trace the problem.

[Shylock-Hg]

It's the expected result. We don't allow multiple input in sentence.

[kikimo]

I see, fetch support two types of input:

1. constant list
2. piped column(only one column allowed)

right? @Shylock-Hg

[Shylock-Hg]

I see, fetch support two types of input:

1. constant list
2. piped column(only one column allowed)

right? @Shylock-Hg

Yes.