cloud-fan commented on code in PR #44938: URL: https://github.com/apache/spark/pull/44938#discussion_r1473736459
########## docs/sql-ref-syntax-qry-select-star.md: ########## @@ -0,0 +1,102 @@ +--- +layout: global +title: star (*) Clause +displayTitle: Star (*) Clause +license: | + 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. +--- + +### Description + +A shorthand to name all the referencable columns in the FROM clause or a specific table reference in the FROM clause. +The star clause clause is most frequently used in the SELECT list. +Spark also supports its use in function invocation and certain n-ary operations within the SELECT list and WHERE clause. + +### Syntax + +``` +[ { table_name | view_name } . ] * [ except_clause ] Review Comment: it's actually more than it, as it can be a column or inner field, e.g. `t1.col.*` and `t1.col.innerField.*` -- 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]
