perf(streams): add single-character fast path for DelimiterStream()
#3739
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
DelimiterStream is often used to delimit formats that use a single char as the separator such as most commonly used flavours of CSV, new-line delimited streamable JSON and others. Multi-character delimiters require extra handling that is entirely unnecessary for char delimiters. As such, it makes sense to special-case char delimiter streams for extra performance.
The performance benefit is at most a few percentage points.