[GitHub] [spark] cloud-fan commented on a change in pull request #28277: [SPARK-31502][SQL][DOCS] Document identifier in SQL Reference

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cloud-fan commented on a change in pull request #28277:
URL: https://github.com/apache/spark/pull/28277#discussion_r414283582



##########
File path: docs/sql-ref-identifier.md
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@@ -0,0 +1,76 @@
+---
+layout: global
+title: Identifiers
+displayTitle: Identifiers
+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
+
+An identifier is a string used to identify a database object such as a table, view, schema, column, etc. Spark SQL has regular identifiers and delimited identifiers, which are enclosed within backticks. When `spark.sql.caseSensitive` is set to false (default behavior since Spark 2.4), both regular identifiers and delimited identifiers are case-insensitive.

Review comment:
       `spark.sql.caseSensitive` is an internal config. Shall we ignore it and just say Spark is case insensitive in the doc?




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