48 lines
1.6 KiB
Rust
48 lines
1.6 KiB
Rust
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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use arrow::datatypes::{DataType, Field, Schema};
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use std::collections::HashMap;
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/// The tests in this file ensure a `Schema` can be manipulated
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/// outside of the arrow crate
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#[test]
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fn schema_destructure() {
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let meta = [("foo".to_string(), "baz".to_string())]
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.into_iter()
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.collect::<HashMap<String, String>>();
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let field = Field::new("c1", DataType::Utf8, false);
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let schema = Schema::new(vec![field]).with_metadata(meta);
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// Destructuring a Schema allows rewriting metadata
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// without copying
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//
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// Model this usecase below:
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let Schema {
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fields,
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mut metadata,
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} = schema;
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metadata.insert("foo".to_string(), "bar".to_string());
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let new_schema = Schema::new(fields).with_metadata(metadata);
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assert_eq!(new_schema.metadata.get("foo").unwrap(), "bar");
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}
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