Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15677#discussion_r85998364
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -1055,8 +1161,12 @@ case class Substring(str: Expression, pos:
Expression, len: Expression)
* A function that return the length of the given string or binary
expression.
*/
@ExpressionDescription(
- usage = "_FUNC_(str | binary) - Returns the length of str or number of
bytes in binary data.",
- extended = "> SELECT _FUNC_('Spark SQL');\n 9")
+ usage = "_FUNC_(expr) - Returns the length of `str` or number of bytes
in binary data.",
--- End diff --
Where is `str`?
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