gbrgr commented on code in PR #1824: URL: https://github.com/apache/iceberg-rust/pull/1824#discussion_r2526373476
########## crates/iceberg/src/metadata_columns.rs: ########## @@ -0,0 +1,97 @@ +// 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. + +//! Metadata columns (virtual/reserved fields) for Iceberg tables. +//! +//! This module defines metadata columns that can be requested in projections +//! but are not stored in data files. Instead, they are computed on-the-fly +//! during reading. Examples include the _file column (file path) and future +//! columns like partition values or row numbers. + +use crate::{Error, ErrorKind, Result}; + +/// Reserved field ID for the file path (_file) column per Iceberg spec +pub const RESERVED_FIELD_ID_FILE: i32 = 2147483646; + +/// Reserved column name for the file path metadata column +pub const RESERVED_COL_NAME_FILE: &str = "_file"; + Review Comment: I created an Arrow lazy field (not an Iceberg field) in metadata_columns.rs -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
