dongjoon-hyun commented on code in PR #41335: URL: https://github.com/apache/spark/pull/41335#discussion_r1208697481
########## docs/sql-ref-identifier-clause.md: ########## @@ -0,0 +1,70 @@ +--- +layout: global +title: Identifier clause +displayTitle: IDENTIFIER 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 + +Convert a constant `STRING` expression into a SQL object name. +The purpose of this clause is to allow for templating of identifiers in SQL statements without opening up the risk of SQL injection attacks. +Typically, this clause is used with a parameter marker as argument. + +### Syntax + +```sql +IDENTIFIER ( strExpr ) +``` + +### Parameters + +- strExpr: A constant STRING expression. Typically, the expression includes a parameter marker. + +### Returns + +A (qualified) identifier which can be used as a: + +- qualified table name +- namespace name +- function name +- qualified column or attribute reference + +### Examples + +```scala +-- Using IDENTIFIER() on a namepace +spark.sql("CREATE SCHEMA IDENTIFIER(:namespace)", args = Map("namespace" -> "mychema") + +-- Using IDENTIFIER() on table DDL +spark.sql("CREATE TABLE IDENTIFIER('myschema.' || :tabname) (c1 INT)", args = Map("tabname" -> "mytable") + +-- Using IDENTIFIER() on table DML +spark.sql("INSERT INTO IDENTIFIER(:tabname) VALUES (1)", args = Map("tabname" -> "myschema.mytable") + +-- Using IDENTIFIER() on a table reference +spark.sql("SELECT * FROM IDENTIFIER(:tabname)", args = Map("tabname" -> "myschema.mytable") Review Comment: Could you include the output here? -- 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]
