Get TileDB Query result buffer element size pair as vectorSource:
The underlying library functions returns a pair of values as a vector of length two. The first number is the number of element offsets for variable size attributes (and always zero for fixed-sized attributes and coordinates). The second is the number of elements in the data buffer. For variable-sized attributes the first number is the number of cells read (and hence the number of offsets), the second number is the number of elements in the data buffer. In the case of a nullable attribute, a third element is returned with the size of the validity buffer.
A TileDB Query object
A character value containing the attribute
A logical variable that is ‘TRUE’ to signal that the attribute is nullable, and ‘FALSE’ otherwise
A vector with the number of elements in the offsets buffer (and zero for fixed-size attribute or dimensions), the number elements in the results buffer for the given attribute, and (if nullable) a third element with the validity buffer size.