[GitHub] [spark] viirya commented on a change in pull request #27866: [SPARK-31110][DOCS][SQL] refine sql doc for SELECT

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viirya commented on a change in pull request #27866: [SPARK-31110][DOCS][SQL] refine sql doc for SELECT
URL: https://github.com/apache/spark/pull/27866#discussion_r390669221
 
 

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 File path: docs/sql-ref-syntax-qry-select-groupby.md
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 @@ -44,7 +44,7 @@ GROUP BY [ GROUPING SETS grouping_sets ] group_expression [ , group_expression [
     set is specified by a list of comma-separated expressions in parentheses.<br><br>
     <b>Syntax:</b>
       <code>
-        ( () | ( expression [ , ... ] ) )
+        ( '()' | ( expression [ , ... ] ) )
 
 Review comment:
   The syntax here indicates one group set or more? In above the syntax is `GROUP BY [ GROUPING SETS grouping_sets ] group_expression [ , group_expression [ , ... ] ]`. 
   
   For example, `group_expression` here is for just one group expression.
   

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