Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r84831284
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/xml/xpath.scala
---
@@ -95,8 +119,16 @@ case class XPathInt(xml: Expression, path: Expression)
extends XPathExtract {
}
@ExpressionDescription(
- usage = "_FUNC_(xml, xpath) - Returns a long value that matches the
xpath expression",
- extended = "> SELECT _FUNC_('<a><b>1</b><b>2</b></a>','sum(a/b)');\n3")
+ usage = "_FUNC_(xml, xpath) - Returns a long value that matches the
XPath expression.",
--- End diff --
This one returns `long`. So, it is accurate but maybe not sufficient.
```scala
scala> spark.sql("SELECT xpath_long('<a><b>1</b><b>2</b></a>',
'a')").printSchema()
root
|-- xpath_long(<a><b>1</b><b>2</b></a>, a): long (nullable = true)
```
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