Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/15513#discussion_r84821301 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/xml/xpath.scala --- @@ -108,8 +140,16 @@ case class XPathLong(xml: Expression, path: Expression) extends XPathExtract { } @ExpressionDescription( - usage = "_FUNC_(xml, xpath) - Returns a float value that matches the xpath expression", - extended = "> SELECT _FUNC_('<a><b>1</b><b>2</b></a>','sum(a/b)');\n3.0") + usage = "_FUNC_(xml, xpath) - Returns a float value that matches the XPath expression.", + extended = """ + Arguments: + xml - a string expression that represents XML document. --- End diff -- `XML document` -> `a XML document`
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