use crate::array::{data::count_nulls, ArrayData};
use crate::buffer::Buffer;
use crate::datatypes::DataType;
use crate::util::bit_util::get_bit;
use super::utils::equal_len;
pub(super) fn decimal_equal(
lhs: &ArrayData,
rhs: &ArrayData,
lhs_nulls: Option<&Buffer>,
rhs_nulls: Option<&Buffer>,
lhs_start: usize,
rhs_start: usize,
len: usize,
) -> bool {
let size = match lhs.data_type() {
DataType::Decimal(_, _) => 16,
_ => unreachable!(),
};
let lhs_values = &lhs.buffers()[0].as_slice()[lhs.offset() * size..];
let rhs_values = &rhs.buffers()[0].as_slice()[rhs.offset() * size..];
let lhs_null_count = count_nulls(lhs_nulls, lhs_start, len);
let rhs_null_count = count_nulls(rhs_nulls, rhs_start, len);
if lhs_null_count == 0 && rhs_null_count == 0 {
equal_len(
lhs_values,
rhs_values,
size * lhs_start,
size * rhs_start,
size * len,
)
} else {
let lhs_null_bytes = lhs_nulls.as_ref().unwrap().as_slice();
let rhs_null_bytes = rhs_nulls.as_ref().unwrap().as_slice();
(0..len).all(|i| {
let lhs_pos = lhs_start + i;
let rhs_pos = rhs_start + i;
let lhs_is_null = !get_bit(lhs_null_bytes, lhs_pos + lhs.offset());
let rhs_is_null = !get_bit(rhs_null_bytes, rhs_pos + lhs.offset());
lhs_is_null
|| (lhs_is_null == rhs_is_null)
&& equal_len(
lhs_values,
rhs_values,
lhs_pos * size,
rhs_pos * size,
size, )
})
}
}