[GitHub] [spark] maropu commented on a change in pull request #28290: [SPARK-29458][SQL][DOCS] Add a paragraph for scalar function in sql getting started

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maropu commented on a change in pull request #28290:
URL: https://github.com/apache/spark/pull/28290#discussion_r414196462



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File path: docs/sql-ref-functions.md
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@@ -27,12 +27,15 @@ Built-in functions are commonly used routines that Spark SQL predefines and a co
 Spark SQL has some categories of frequently-used built-in functions for aggregtion, arrays/maps, date/timestamp, and JSON data.
 This subsection presents the usages and descriptions of these functions.
 
- * [Aggregate Functions](sql-ref-functions-builtin.html#aggregate-functions)
- * [Window Functions](sql-ref-functions-builtin.html#window-functions)
+#### Scalar Functions
  * [Array Functions](sql-ref-functions-builtin.html#array-functions)
  * [Map Functions](sql-ref-functions-builtin.html#map-functions)
  * [Date and Timestamp Functions](sql-ref-functions-builtin.html#date-and-timestamp-functions)
  * [JSON Functions](sql-ref-functions-builtin.html#json-functions)
+ * [Window Functions](sql-ref-functions-builtin.html#window-functions)

Review comment:
       I think vector input & output rather than scalar input & output. WDYT? @HyukjinKwon 




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