a faster sqlite3VdbeMemSetNull
a faster sqlite3VdbeMemSetNull


Former-commit-id: 77d9a6b60d1f6307076057c7e199bcd9b59424da
HPI-SWA-Lab/SQPyte,HPI-SWA-Lab/SQPyte,HPI-SWA-Lab/SQPyte,HPI-SWA-Lab/SQPyte,HPI-SWA-Lab/SQPyte