Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/15398#discussion_r111704017
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
---
@@ -68,7 +68,30 @@ trait StringRegexExpression extends
ImplicitCastInputTypes {
* Simple RegEx pattern matching function
*/
@ExpressionDescription(
- usage = "str _FUNC_ pattern - Returns true if `str` matches `pattern`,
or false otherwise.")
+ usage = "str _FUNC_ pattern - Returns true if str matches pattern, " +
+ "null if any arguments are null, false otherwise.",
+ extended = """
+ Arguments:
+ str - a string expression
+ pattern - a string expression. The pattern is a string which is
matched literally, with
+ exception to the following special symbols:
+
+ _ matches any one character in the input (similar to . in posix
regular expressions)
+
+ % matches zero ore more characters in the input (similar to .*
in posix regular
--- End diff --
ore -> or?
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