Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/15513#discussion_r84597610 --- 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 -- What is the differences between `a string expression` and `a string literal`?
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