arrow_json/reader/
null_array.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use crate::reader::tape::{Tape, TapeElement};
19use crate::reader::ArrayDecoder;
20use arrow_data::{ArrayData, ArrayDataBuilder};
21use arrow_schema::{ArrowError, DataType};
22
23#[derive(Default)]
24pub struct NullArrayDecoder {}
25
26impl ArrayDecoder for NullArrayDecoder {
27    fn decode(&mut self, tape: &Tape<'_>, pos: &[u32]) -> Result<ArrayData, ArrowError> {
28        for p in pos {
29            if !matches!(tape.get(*p), TapeElement::Null) {
30                return Err(tape.error(*p, "null"));
31            }
32        }
33        ArrayDataBuilder::new(DataType::Null).len(pos.len()).build()
34    }
35}
arrow_json/reader/null_array.rs

arrow_json/reader/
null_array.rs
