RFR: 8294361: Cleanup usages of StringBuffer in SQLOutputImpl

[Roger Riggs]

On Sat, 17 Sep 2022 21:43:04 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> There a few unnecessary usages of StringBuffer in SQLOutputImpl class.
> All of them create StringBuffer from single character and then concatenate with String. Instead of this, we can concatenate character directly.

Marked as reviewed by rriggs (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10320