#import "MDDFunctionQuery.h"

#import "MDDQuery+Private.h"

#import "MDDItem.h"

#import "MDDRange.h"

#import "MDDDescription.h"

@implementation MDDFunctionQuery

+ (instancetype)functionQueryWithTableInfo:(id<MDDTableInfo>)tableInfo property:(MDDFuntionProperty *)property;{

return [self functionQueryWithTableInfo:tableInfo property:property alias:nil];

}

+ (instancetype)functionQueryWithTableInfo:(id<MDDTableInfo>)tableInfo property:(MDDFuntionProperty *)property alias:(NSString *)alias;{

MDDFunctionQuery *query = [self descriptorWithTableInfo:tableInfo];

query.properties = (id)[NSSet setWithObject:property];

query.alias = alias;

query.transform = ^id(NSDictionary *result) {

return property.alias ? result[property.alias] : result;

};

return query;

}

- (MDDDescription *)SQLDescription{

MDDDescription *description = [super SQLDescription];

if (_alias) return [MDDDescription descriptionWithSQL:[NSString stringWithFormat:@" ( %@ ) AS %@", [description SQL], _alias] values:[description values]];

return description;

}