private bool AssignAggregateFunction(Function function, QueryCriteria queryCriteria)
{
AggregateFunctionType agrFunctionType;
switch (function.FunctionName)
{
case "max":
agrFunctionType = AggregateFunctionType.MAX;
break;
case "min":
agrFunctionType = AggregateFunctionType.MIN;
break;
case "avg":
agrFunctionType = AggregateFunctionType.AVG;
break;
case "sum":
agrFunctionType = AggregateFunctionType.SUM;
break;
case "count":
agrFunctionType = AggregateFunctionType.COUNT;
break;
case "first":
agrFunctionType = AggregateFunctionType.FIRST;
break;
case "last":
agrFunctionType = AggregateFunctionType.LAST;
break;
default:
agrFunctionType = AggregateFunctionType.NOTAPPLICABLE;
break;
}
if (!agrFunctionType.Equals(AggregateFunctionType.NOTAPPLICABLE))
{
if (function.Arguments.Count > 1)
{
throw new QuerySystemException(ErrorCodes.Query.INVALID_NUMBER_OF_AGGREGATE_FUNCTION_ARGUMENTS, new[] { function.ToString() });
}
if (function.ArgumentFunctions.Count > 0)
{
foreach (var func in function.ArgumentFunctions)
{
var functionName = func.FunctionName;
if (functionName.Equals("max") || functionName.Equals("min") ||
functionName.Equals("avg") || functionName.Equals("sum") ||
functionName.Equals("count") || functionName.Equals("first") ||
functionName.Equals("last"))
{
//An aggregate function shouldn't contain any aggregate function in its arguments.
throw new QuerySystemException(ErrorCodes.Query.INVALID_AGGREGATE_FUNCTION_ARGUMENTS, new[] { functionName });
}
}
}
function.ExecutionType = FunctionExecutionType.Aggregate;
queryCriteria.AddAggregateFunction(agrFunctionType, function.Arguments[0]);
return(true);
}
return(false);
}
