adriangb commented on code in PR #15057: URL: https://github.com/apache/datafusion/pull/15057#discussion_r1994289444
########## datafusion/datasource/src/file_expr_rewriter.rs: ########## @@ -0,0 +1,34 @@ +// 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 std::fmt::Debug; +use std::sync::Arc; + +use arrow::datatypes::SchemaRef; +use datafusion_common::Result; +use datafusion_physical_plan::PhysicalExpr; + +/// Rewrite an expressions to take into account this file's particular schema. +/// This can be used to evaluate expressions against shredded variant columns or columns that pre-compute expressions (e.g. `day(timestamp)`). +pub trait FileExpressionRewriter: Debug + Send + Sync { + /// Rewrite an an expression in the context of a file schema. + fn rewrite( + &self, + file_schema: SchemaRef, + expr: Arc<dyn PhysicalExpr>, + ) -> Result<Arc<dyn PhysicalExpr>>; +} Review Comment: Note: if users need the `table_schema` they can bind that inside of `TableProvider::scan` -- 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]
