Examples of DrillFuncHolder


      //replace with a new function call, since its argument could be changed.
      call = new FunctionCall(call.getName(), args, call.getPosition());


      FunctionResolver resolver = FunctionResolverFactory.getResolver(call);
      DrillFuncHolder matchedFuncHolder = registry.findDrillFunction(resolver, call);


      if (matchedFuncHolder instanceof DrillComplexWriterFuncHolder && ! allowComplexWriter) {
        errorCollector.addGeneralError(call.getPosition(), "Only ProjectRecordBatch could have complex writer function. You are using complex writer function " + call.getName() + " in a non-project operation!");
      }


      //new arg lists, possible with implicit cast inserted.
      List<LogicalExpression> argsWithCast = Lists.newArrayList();


      if (matchedFuncHolder!=null) {
        //Compare parm type against arg type. Insert cast on top of arg, whenever necessary.
        for (int i = 0; i < call.args.size(); ++i) {


          LogicalExpression currentArg = call.args.get(i);


          TypeProtos.MajorType parmType = matchedFuncHolder.getParmMajorType(i);


          //Case 1: If  1) the argument is NullExpression
          //            2) the parameter of matchedFuncHolder allows null input, or func's null_handling is NULL_IF_NULL (means null and non-null are exchangable).
          //        then replace NullExpression with a TypedNullConstant
          if (currentArg.equals(NullExpression.INSTANCE) &&
            ( parmType.getMode().equals(TypeProtos.DataMode.OPTIONAL) ||
              matchedFuncHolder.getNullHandling() == FunctionTemplate.NullHandling.NULL_IF_NULL)) {
            argsWithCast.add(new TypedNullConstant(parmType));
          } else if (Types.softEquals(parmType, currentArg.getMajorType(), matchedFuncHolder.getNullHandling() == FunctionTemplate.NullHandling.NULL_IF_NULL) ||
                     matchedFuncHolder.isFieldReader(i)) {
            //Case 2: argument and parameter matches, or parameter is FieldReader.  Do nothing.
            argsWithCast.add(currentArg);
          } else {
            //Case 3: insert cast if param type is different from arg type.
            argsWithCast.add(addCastExpression(call.args.get(i), parmType, registry));
          }
        }


        return matchedFuncHolder.getExpr(call.getName(), argsWithCast, call.getPosition());
      }


      // as no drill func is found, search for a non-Drill function.
      AbstractFuncHolder matchedNonDrillFuncHolder = registry.findNonDrillFunction(call);
      if (matchedNonDrillFuncHolder != null) {

        FunctionImplementationRegistry registry) {
      String funcName = "convertToNullable" + minorType.toString();
      FunctionCall funcCall = new FunctionCall(funcName, args, ExpressionPosition.UNKNOWN);
      FunctionResolver resolver = FunctionResolverFactory.getResolver(funcCall);


      DrillFuncHolder matchedConvertToNullableFuncHolder = registry.findDrillFunction(resolver, funcCall);


      if (matchedConvertToNullableFuncHolder == null) {
        logFunctionResolutionError(errorCollector, funcCall);
        return NullExpression.INSTANCE;
      }


      return matchedConvertToNullableFuncHolder.getExpr(funcName, args, ExpressionPosition.UNKNOWN);
    }

Examples of DrillFuncHolder

Examples of org.apache.drill.exec.expr.fn.DrillFuncHolder

Examples of org.apache.drill.exec.expr.fn.DrillFuncHolder