Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7259#discussion_r34950855
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -119,6 +119,10 @@ trait CaseConversionExpression extends
ExpectsInputTypes {
/**
* A function that converts the characters of a string to uppercase.
*/
+@ExpressionDescription(
+ usage = "_FUNC_(str) - Returns str with all characters changed to
uppercase",
+ extended = """> SELECT _FUNC_('SparkSql') FROM src LIMIT 1;
--- End diff --
we support `SELECT _FUNC_('SparkSql')` directly. Not need to add "FROM src
LIMIT 1"
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