RFR: 8294361: Cleanup usages of StringBuffer in SQLOutputImpl

[Lance Andersen]

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.

The changes seem fine based on what your goal was.

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Marked as reviewed by lancea (Reviewer).

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