findepi commented on code in PR #12853: URL: https://github.com/apache/datafusion/pull/12853#discussion_r1798843685
########## datafusion/common/src/types/logical.rs: ########## @@ -0,0 +1,58 @@ +// 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 core::fmt; +use std::{cmp::Ordering, hash::Hash, sync::Arc}; + +use super::NativeType; + +/// A reference counted [`LogicalType`] +pub type LogicalTypeRef = Arc<dyn LogicalType>; + +pub trait LogicalType: fmt::Debug { + fn native(&self) -> &NativeType; Review Comment: Given say arrow Int64 data, i want to know whether these is numbers, timestamp, time, date or something else (eg user-defined enum). The fact that any of these hypothetical logical types could be stored as Int64 doesn't help me know. Asking logical type "could you please decode this arrow type?" doesn't help me know. Thus, going from arrow type to logical type is not an option. We simply need to know what logical type this should be. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org
