jayzhan211 commented on code in PR #13706: URL: https://github.com/apache/datafusion/pull/13706#discussion_r1878012900
########## docs/source/user-guide/sql/dialect.md: ########## @@ -0,0 +1,38 @@ +<!--- + 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. +--> + +# SQL Dialect + +By default, Apache DataFusion follows the [PostgreSQL SQL dialect]. +For Array/List functions and semantics, it follows the [DuckDB SQL dialect]. + +[duckdb sql dialect]: https://duckdb.org/docs/sql/functions/array +[postgresql sql dialect]: https://www.postgresql.org/docs/current/sql.html Review Comment: Nested functions are not well-supported in Postgres, so we choose DuckDB and other OLAP systems for these kind of function. We don’t enforce strict adherence to any particular system for function implementation. Instead, our goal is to establish a default behavior in the DataFusion core while making it easy to customize functions as needed. Given that Postgres and DuckDB are enough for us to decide what the function should be like so we ends up these 2. -- 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
