pub fn conditional_copy_i64_to(
mask: &BooleanArray<()>,
then_data: &[i64],
else_data: &[i64],
output: &mut [i64],
)Expand description
Zero-allocation variant: writes directly to caller’s output buffer.
Conditional copy operation: select elements from then_data or else_data based on boolean mask.
Panics if output.len() != mask.len.