Github user HyukjinKwon commented on the issue:

    https://github.com/apache/spark/pull/17826
  
    Hi @cloud-fan and @brkyvz, just while checking related issues with it just 
for my curiosity, I just realised that we are throwing an exception in XML 
related expressions as below:
    
    ```scala
    scala> sql("SELECT xpath_string('<a><b>b</b><c>cc</c></','a/c')").show()
    ...
    java.lang.RuntimeException: Invalid XML document: 
org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 23; XML document 
structures must start and end within the same entity.
    <a><b>b</b><c>cc</c></
      at 
org.apache.spark.sql.catalyst.expressions.xml.UDFXPathUtil.eval(UDFXPathUtil.java:72)
      at 
org.apache.spark.sql.catalyst.expressions.xml.UDFXPathUtil.evalString(UDFXPathUtil.java:81)
      at 
org.apache.spark.sql.catalyst.expressions.xml.XPathString.nullSafeEval(xpath.scala:186)
    ...
    ```
    
    Should we fix these expressions too or just leave them out for now?


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