alamb commented on code in PR #18855: URL: https://github.com/apache/datafusion/pull/18855#discussion_r2582851884
########## datafusion/execution/src/cache/list_files_cache.rs: ########## @@ -0,0 +1,731 @@ +// 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. + Review Comment: I this something you are willing to do, or shall I make one? ########## docs/source/library-user-guide/upgrading.md: ########## @@ -40,6 +40,23 @@ directly on the `Field`. For example: + let field = Arc::clone(df_schema.field("my_column")); ``` +### ListingTableProvider now caches `LIST` commands Review Comment: I added this section to communicate the new behavior ########## datafusion/core/tests/datasource/object_store_access.rs: ########## @@ -98,6 +98,59 @@ async fn create_multi_file_csv_file() { ); } +#[tokio::test] +async fn multi_query_multi_file_csv_file() { + let test = Test::new().with_multi_file_csv().await; + assert_snapshot!( + test.query("select * from csv_table").await, + @r" + ------- Query Output (6 rows) ------- + +---------+-------+-------+ + | c1 | c2 | c3 | + +---------+-------+-------+ + | 0.0 | 0.0 | true | + | 0.00003 | 5e-12 | false | + | 0.00001 | 1e-12 | true | + | 0.00003 | 5e-12 | false | + | 0.00002 | 2e-12 | true | + | 0.00003 | 5e-12 | false | + +---------+-------+-------+ + ------- Object Store Request Summary ------- + RequestCountingObjectStore() + Total Requests: 4 + - LIST prefix=data + - GET (opts) path=data/file_0.csv + - GET (opts) path=data/file_1.csv + - GET (opts) path=data/file_2.csv + " + ); + + // the second query should re-use the cached LIST results and should not reissue LIST + assert_snapshot!( + test.query("select * from csv_table").await, + @r" + ------- Query Output (6 rows) ------- + +---------+-------+-------+ + | c1 | c2 | c3 | + +---------+-------+-------+ + | 0.0 | 0.0 | true | + | 0.00003 | 5e-12 | false | + | 0.00001 | 1e-12 | true | + | 0.00003 | 5e-12 | false | + | 0.00002 | 2e-12 | true | + | 0.00003 | 5e-12 | false | + +---------+-------+-------+ + ------- Object Store Request Summary ------- + RequestCountingObjectStore() + Total Requests: 4 Review Comment: @BlakeOrth this seems wrong to me -- now that we have a ListFilesCache, I would expect this query to *NOT* need to do a `LIST` command 🤔 -- 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]
