Package dev.frostlake.functions.scalar.semistructured

Class XmlGet

java.lang.Object
dev.frostlake.functions.BuiltInFunction
dev.frostlake.functions.scalar.semistructured.XmlGet
public class XmlGet extends BuiltInFunction
XMLGET(xml, tag_name [, instance]) — the instance-th (0-based, default 0) direct child element with the given tag name, taken from the XML element's "$" content; SQL NULL when the value is not an XML element, the tag does not occur (matching is case-sensitive), or the instance is out of range (a negative instance is NULL too, live-verified). A VARCHAR first argument is rejected at compile time, as in Snowflake.

  • Constructor Details

    • XmlGet

      public XmlGet()

  • Method Details

    • evaluate

      public Object evaluate(List<Object> args)
      Description copied from class: BuiltInFunction
      Computes the function's result over its already-evaluated argument values. A SQL NULL argument arrives as Java null, and returning null makes the SQL result NULL.
      Specified by:
      evaluate in class BuiltInFunction
      Parameters:
      args - the argument values, in call order
      Returns:
      the function's value for these arguments, or null for SQL NULL

    • getMinArgCount

      public int getMinArgCount()
      Description copied from class: BuiltInFunction
      The fewest arguments a call to this function may pass; fewer is an argument-count error.
      Specified by:
      getMinArgCount in class BuiltInFunction
      Returns:
      the minimum accepted argument count

    • getMaxArgCount

      public int getMaxArgCount()
      Description copied from class: BuiltInFunction
      The most arguments a call to this function may pass; Integer.MAX_VALUE marks a variadic function (see BuiltInFunction.isVariadic()).
      Specified by:
      getMaxArgCount in class BuiltInFunction
      Returns:
      the maximum accepted argument count