refactor(pgwire): Match on char to avoid utf8 convert

[Xuanwo]

I hereby agree to the terms of the CLA available at: s9y-cla

Signed-off-by: Xuanwo [email protected]

What's changed and what's your intention?

The convert from &[u8] to &str is not needed, as we can match on the char directly.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

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[skyzh]

Thanks @Xuanwo! As we have not made our repo public yet, the CLA assistant cannot be enabled now. Would you please manually go to this URL https://cla-assistant.io/singularity-data/ and agree on this CLA? Thanks!

[Xuanwo]

I got a 401 error from https://cla-assistant.io/api/github/call, seems buggy (:

[skyzh]

Oops, then you may modify your PR body to have one line of text:

I hereby agree to the terms of the CLA available at: s9y-cla

[Xuanwo]

Oops, then you may modify your PR body to have one line of text:

I hereby agree to the terms of the CLA available at: s9y-cla

Done