/
decimal.rs
74 lines (66 loc) · 2.7 KB
/
decimal.rs
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
use crate::array::{data::count_nulls, ArrayData};
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_start: usize,
rhs_start: usize,
len: usize,
) -> bool {
let size = match lhs.data_type() {
DataType::Decimal(_, _) => 16,
DataType::Decimal256(_, _) => 32,
_ => 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.null_buffer(), lhs_start + lhs.offset(), len);
let rhs_null_count = count_nulls(rhs.null_buffer(), rhs_start + rhs.offset(), 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 {
// get a ref of the null buffer bytes, to use in testing for nullness
let lhs_null_bytes = lhs.null_buffer().as_ref().unwrap().as_slice();
let rhs_null_bytes = rhs.null_buffer().as_ref().unwrap().as_slice();
// with nulls, we need to compare item by item whenever it is not null
(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 + rhs.offset());
lhs_is_null
|| (lhs_is_null == rhs_is_null)
&& equal_len(
lhs_values,
rhs_values,
lhs_pos * size,
rhs_pos * size,
size, // 1 * size since we are comparing a single entry
)
})
}
}