Fix #21: correctly call Reset on the varchar chunk in the MySQL scan … #7

Job	Run time
Build extension binaries / Generate matrix	19s
Build extension binaries / Generate matrix	20s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	4m 43s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	2m 50s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	17m 13s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	14m 59s
Build extension binaries / MacOS	0s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	8m 29s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	17m 45s
Deploy extension binaries / Generate matrix	29s
Deploy extension binaries / Deploy (linux_amd64)	29s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	27s
Deploy extension binaries / Deploy (linux_arm64)	39s
Deploy extension binaries / Deploy (osx_amd64)	26s
Deploy extension binaries / Deploy (osx_arm64)	30s
Deploy extension binaries / Deploy (windows_amd64)	28s
	1h 10m 6s

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