Cleaned out obsolete code from map_fields.cpp.
Cleaned out obsolete code from map_fields.cpp.

V3-Alliance/R_data_analytics_bigmemory_tutorial,V3-Alliance/R_data_analytics_bigmemory_tutorial,V3-Alliance/R_data_analytics_bigmemory_tutorial,V3-Alliance/R_data_analytics_bigmemory_tutorial