Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r84604598
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/xml/xpath.scala
---
@@ -150,8 +206,16 @@ case class XPathString(xml: Expression, path:
Expression) extends XPathExtract {
// scalastyle:off line.size.limit
@ExpressionDescription(
- usage = "_FUNC_(xml, xpath) - Returns a string array of values within
xml nodes that match the xpath expression",
- extended = "> SELECT
_FUNC_('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>','a/b/text()');\n['b1','b2','b3']")
+ usage = "_FUNC_(xml, xpath) - Returns a string array of values within
the nodes of xml that match the XPath expression.",
+ extended = """
+ Arguments:
+ xml - a string expression that represents XML document.
+ path - a string literal that represents XPath expression.
--- End diff --
expression takes both value and column where as literal takes value only in
general.
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