[GitHub] [arrow-rs] tustvold commented on a diff in pull request #1820: Add ScalarBuffer abstraction (#1811)

[GitBox <gi...@apache.org>]

tustvold commented on code in PR #1820:
URL: https://github.com/apache/arrow-rs/pull/1820#discussion_r892632826


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arrow/src/buffer/scalar.rs:
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@@ -0,0 +1,149 @@
+// 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::buffer::Buffer;
+use crate::datatypes::ArrowNativeType;
+use std::ops::Deref;
+
+/// Provides a safe API for interpreting a [`Buffer`] as a slice of [`ArrowNativeType`]
+///
+/// # Safety
+///
+/// All [`ArrowNativeType`] are valid for all possible backing byte representations, and as
+/// a result they are "trivially safely transmutable".
+#[derive(Debug)]
+pub struct ScalarBuffer<T: ArrowNativeType> {

Review Comment:
   We definitely could make it crate local, I think a `ScalarMutableBuffer` would be of great interest to parquet, and so I was just thinking we'd provide public safe APIs for interacting with buffers. Don't feel strongly



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