In OmniSciDB, an array has the following internal representation:
Creating an Array programmatically
*Notice that returning an empty array is an invalid operation that might crash the server.
One can also use one of the array creation functions as specified in the python Array API standard: full, full_like, zeros, zeros_like, ones and ones_like:
Accessing a pointer member
Getting the size of an array
Checking for null
You can either check if an array is null or if an array value is null
typedef struct {
T* data; // contiguous memory block
int64_t size;
int8 is_null; // boolean values in omniscidb are represented as int8 variables
} Array;
from numba import types as nb_types
from rbc.omnisci_backend import Array
@omnisci('double[](int64)')
def create_array(size):
array = Array(size, nb_types.double)
for i in range(size):
array[i] = nb_types.double(i)
return array
from numba import types as nb_types
import rbc.omnisci_backend as omni
@omnisci('double[](int64)')
def zero_array(size):
return omni.zeros(size, nb_types.double)