enh: resolve unit test and few other warnings. #14

Job	Run time
android-arm64-v8a-ndk-cmake	5m 42s
android-arm64-v8a-ndk-latest-cmake	7m 35s
android-armeabi-v7a-ndk-cmake	6m 4s
linux-gcc-make	23m 51s
linux-gcc-make-armv7l	13m 40s
linux-gcc-make-asan	29m 20s
linux-emscripten-cmake	4m 42s
linux-gcc-make-cxx20	27m 8s
linux-gcc-cmake	19m 58s
linux-gcc-make-asan-no-soo	29m 17s
linux-gcc-make-ubsan	35m 11s
linux-gcc-make-tsan	25m 3s
linux-gcc-make-cross-armhf	13m 34s
macos-clang-cmake-openssl3	23m 4s
macos-clang-cmake-openssl3-visibility-hidden	24m 30s
macos-clang-cmake-openssl	24m 38s
macos-clang-make	29m 4s
macos-clang-make-openssl3-tsan	24m 13s
macos-clang-make-visibility-hidden	29m 8s
linux-gcc-make-mysql	6m 59s
linux-gcc-make-postgres	7m 18s
macos-clang-make-openssl3-asan	27m 9s
macos-clang-make-openssl3-ubsan	41m 8s
windows-2022-msvc-buildwin-x64	34m 12s
windows-2022-msvc-cmake	22m 28s
linux-gcc-make-mongodb	7m 18s
linux-gcc-make-odbc	8m 50s
linux-gcc-make-redis	7m 7s
linux-gcc-make-sqlite-no-sqlparser	6m 53s
	9h 25m 4s

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