public Map<String, Object> getMemberSpecificArgumentsMap() {
    return memberToArgMap;
  }
Arguments for a function need to be conditionalized on the target member. Pass an argument that
contains a default object as well as a map of member id to Serializable. When the function is
distributed, the* target member is looked up in this map by the function service. If the target
member id has a value in the map, then that value is used as an argument for that distribution.
If that member id is not found, then the default value is used as an argument instead.

For the SQL Fabric, its use would be as follows: The defaultArgument is set to be the query
string. The keys of the map are set to be all known member ids that have already prepared this
statement, and the values are all null (to be interpreted as no argument).

This way, when the function is distributed to a member that is not in the map, it will include
the query string as an argument. When it is sent to a member that is in the map, will not include
the query string as an argument.

@since GemFire 6.0
geode-core/src/main/java/org/apache/geode/internal/cache/execute/MemberMappedArgument.java