enable renaming of attributes in join operators to be handled by SQL serializer
enable renaming of attributes in join operators to be handled by SQL serializer

IITDBGroup/gprom,mikebrachmann/gprom,IITDBGroup/gprom,mikebrachmann/gprom,IITDBGroup/gprom,mikebrachmann/gprom,IITDBGroup/gprom,mikebrachmann/gprom,IITDBGroup/gprom,mikebrachmann/gprom,IITDBGroup/gprom,mikebrachmann/gprom,mikebrachmann/gprom