xpath_long function
Applies to: 
Databricks SQL Databricks Runtime
Returns an BIGINT value from an XML document.
Syntax
xpath_long(xml, xpath)
Arguments
xml: A STRING expression of XML.xpath: A STRING expression that is a well formed XPath.
Returns
A BIGINT.
The result is zero if no match is found, or a match is found but the value is non-numeric.
The function raises an error if xml or xpath are malformed.
Examples
SQL
> SELECT xpath_long('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3