Package org.apache.drill.exec.resolver

Interface FunctionResolver

All Known Implementing Classes:
DefaultFunctionResolver, ExactFunctionResolver
public interface FunctionResolver
An implementing class of FunctionResolver provide their own algorithm to choose a DrillFuncHolder from a given list of candidates, with respect to a given FunctionCall

  • Method Details

    • getBestMatch

      DrillFuncHolder getBestMatch(List<DrillFuncHolder> methods, FunctionCall call)
      Creates a placeholder SqlFunction for an invocation of a function with a possibly qualified name. This name must be resolved into either a builtin function or a user-defined function.
      Parameters:
      methods - a list of candidates of DrillFuncHolder to be chosen from
      call - a given function call whose DrillFuncHolder is to be determined via this method
      Returns:
      DrillFuncHolder the chosen DrillFuncHolder