Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12185#discussion_r59122487
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -396,6 +422,9 @@ case class StringTrimRight(child: Expression)
*
* NOTE: that this is not zero based, but 1-based index. The first
character in str has index 1.
*/
+@ExpressionDescription(
+ usage = "_FUNC_(str, substr) - Returns the index of the first occurrence
of substr in str.",
+ extended = "> SELECT _FUNC_('SparkSQL', 'SQL');\n 6")
--- End diff --
I think we need to be clear that it is 1-based index.
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