docs: synchronized void removeSession(long sessionID) {
  
          LongKeyIntValueHashMap scsMap;
          long                   csid;
          Iterator               i;
  
          scsMap = (LongKeyIntValueHashMap) sessionUseMap.remove(sessionID);
  
          if (scsMap == null) {
              return;
          }
  
          i = scsMap.keySet().iterator();
  
          while (i.hasNext()) {
              csid = i.nextLong();
  
              int usecount = useMap.get(csid, 1) - 1;
  
              if (usecount == 0) {
                  Statement cs = (Statement) csidMap.remove(csid);
  
                  if (cs != null) {
                      int schemaid = cs.getSchemaName().hashCode();
                      LongValueHashMap sqlMap =
                          (LongValueHashMap) schemaMap.get(schemaid);
                      String sql = (String) sqlLookup.remove(csid);
  
                      sqlMap.remove(sql);
                  }
  
                  useMap.remove(csid);
              } else {
                  useMap.put(csid, usecount);
              }
          }
      }