tshauck commented on code in PR #10890: URL: https://github.com/apache/datafusion/pull/10890#discussion_r1640558703
########## datafusion-cli/examples/cli-session-context.rs: ########## @@ -0,0 +1,99 @@ +// 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. + +//! Shows an example of a custom session context that unions the input plan with itself. +//! To run this example, use `cargo run --example cli-session-context` from within the `datafusion-cli` directory. + +use std::{process::ExitCode, sync::Arc}; + +use datafusion::{ + dataframe::DataFrame, + error::DataFusionError, + execution::{context::SessionState, TaskContext}, + logical_expr::{LogicalPlan, LogicalPlanBuilder}, + prelude::SessionContext, +}; +use datafusion_cli::{ + cli_context::CliSessionContext, exec::exec_from_repl, print_options::PrintOptions, +}; +use object_store::ObjectStore; + +/// This is a toy example of a custom session context that unions the input plan with itself. +struct MyUnionerContext { + ctx: SessionContext, +} + +impl Default for MyUnionerContext { + fn default() -> Self { + Self { + ctx: SessionContext::new(), + } + } +} + +#[async_trait::async_trait] +impl CliSessionContext for MyUnionerContext { + fn task_ctx(&self) -> Arc<TaskContext> { + self.ctx.task_ctx() + } + + fn state(&self) -> SessionState { + self.ctx.state() + } + + fn register_object_store( + &self, + url: &url::Url, + object_store: Arc<dyn ObjectStore>, + ) -> Option<Arc<dyn ObjectStore + 'static>> { + self.ctx.register_object_store(url, object_store) + } + + fn register_options(&self, _scheme: &str) { + unimplemented!() + } + + async fn execute_logical_plan( Review Comment: E.g. ``` arrow-datafusion/datafusion-cli poc-for-… ➜ cargo run --example cli-session-context Compiling datafusion-cli v39.0.0 (/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion/datafusion-cli) Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.61s Running `target/debug/examples/cli-session-context` > SELECT 1; +----------+ | Int64(1) | +----------+ | 1 | | 1 | +----------+ 2 row(s) fetched. Elapsed 0.019 seconds. ``` -- 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
