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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