argVals := make([]*Value, len(e.SFunc.ArgsList))
	for i, arg := range e.SFunc.ArgsList {
		argVals[i], err = arg.evalNode(r, tableAlias)
		if err != nil {
			return nil, err
		}
	}

	switch e.getFunctionName() {
	case sqlFnCoalesce:
		return coalesce(argVals)

	case sqlFnNullIf:
		return nullif(argVals[0], argVals[1])

		e.aggregate.runningCount++
		// Convert to float.
		f, ok := argVal.ToFloat()
		if !ok {
			return fmt.Errorf("Could not convert value %v (%s) to a number", argVal.value, argVal.GetTypeString())
		}
		argVal.setFloat(f)
		err = e.aggregate.runningSum.arithOp(opPlus, argVal)

	case aggFnMin:
		err = e.aggregate.runningMin.minmax(argVal, false, isFirstRow)

	case aggFnMax: