public void setAggregation (boolean b) {
      this.isAggregation = b;
   }
Maps a given class type to a corresponding SQL type.

@param typeString the class type as a string
@return the corresponding SQL type, or {@link java.sql.Types#OTHER} if no corresponding type is found.
src/main/java/org/replicadb/rowset/MongoDBRowSetImpl.java