Struct arrow::array::NullArray [−][src]
pub struct NullArray { /* fields omitted */ }
Expand description
An Array where all elements are nulls
A NullArray
is a simplified array where all values are null.
Example: Create an array
use arrow::array::{Array, NullArray};
let array = NullArray::new(10);
assert_eq!(array.len(), 10);
assert_eq!(array.null_count(), 10);
Implementations
Trait Implementations
Returns whether the element at index
is null.
All elements of a NullArray
are always null.
Returns whether the element at index
is valid.
All elements of a NullArray
are always invalid.
Returns the total number of null values in this array.
The null count of a NullArray
always equals its length.
Returns a reference-counted pointer to the underlying data of this array.
Returns a zero-copy slice of this array with the indicated offset and length. Read more
Returns the offset into the underlying data used by this array(-slice).
Note that the underlying data can be shared by many arrays.
This defaults to 0
. Read more
Returns the total number of bytes of memory pointed to by this array. The buffers store bytes in the Arrow memory format, and include the data as well as the validity map. Read more
Returns the total number of bytes of memory occupied physically by this array.
This value will always be greater than returned by get_buffer_memory_size()
and
includes the overhead of the data structures that contain the pointers to the various buffers. Read more
returns two pointers that represent this array in the C Data Interface (FFI)