xpath_number function
Applies to: 
Databricks SQL Databricks Runtime
Returns a DOUBLE value from an XML document.
Syntax
xpath_number(xml, xpath)
Arguments
xml: ASTRINGexpression of XML.xpath: ASTRINGexpression that is a well formed XPath.
Returns
A DOUBLE.
The result is zero if no match is found, or NaN if 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_number('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3.0