OP_MemNull        149 ext/pdo_sqlite/sqlite/src/analyze.c       sqlite3VdbeAddOp(v, OP_MemNull, iMem+nCol+i+1, 0);
OP_MemNull       1487 ext/pdo_sqlite/sqlite/src/expr.c         sqlite3VdbeAddOp(v, OP_MemNull, iMem, 0);
OP_MemNull       2646 ext/pdo_sqlite/sqlite/src/select.c     sqlite3VdbeAddOp(v, OP_MemNull, pAggInfo->aCol[i].iMem, 0);
OP_MemNull       2649 ext/pdo_sqlite/sqlite/src/select.c     sqlite3VdbeAddOp(v, OP_MemNull, pFunc->iMem, 0);
OP_MemNull       4438 ext/pdo_sqlite/sqlite/src/vdbe.c case OP_MemNull: {