Change test mock source and sink to use column based format, also fix small bugs that occured from it #367

	# This workflow will build a .NET project
	# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-net

	name: Benchmarks

	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	jobs:
	build:

	runs-on: windows-latest

	steps:
	- uses: actions/checkout@v3
	- name: Setup .NET
	uses: actions/setup-dotnet@v3
	with:
	dotnet-version: 8.0.x
	- uses: actions/cache@v3
	with:
	path: ~/.nuget/packages
	# Look to see if there is a cache hit for the corresponding requirements file
	key: ${{ runner.os }}-nuget-${{ hashFiles('*/.csproj') }}
	restore-keys: \|
	${{ runner.os }}-nuget
	- name: Download previous benchmark data
	uses: actions/cache@v4
	with:
	path: ./cache
	key: ${{ runner.os }}-benchmark
	- name: Run benchmark
	run: dotnet run --project ./tests/FlowtideDotNet.Benchmarks/FlowtideDotNet.Benchmarks.csproj -c Release --filter StreamBenchmark --exporters json
	- name: Git reset
	run: git reset --hard
	- name: Store benchmark result
	uses: benchmark-action/github-action-benchmark@v1
	with:
	tool: 'benchmarkdotnet'
	output-file-path: BenchmarkDotNet.Artifacts/results/FlowtideDotNet.Benchmarks.Stream.StreamBenchmark-report-full-compressed.json
	external-data-json-path: ./cache/benchmark-data.json
	fail-on-alert: false
	github-token: ${{ secrets.GITHUB_TOKEN }}
	comment-on-alert: true
	summary-always: true
	comment-always: true

Provide feedback