docs: private long registerStatement(long csid, Statement cs) {
  
          if (csid < 0) {
              csid = nextID();
  
              int schemaid = cs.getSchemaName().hashCode();
              LongValueHashMap sqlMap =
                  (LongValueHashMap) schemaMap.get(schemaid);
  
              if (sqlMap == null) {
                  sqlMap = new LongValueHashMap();
  
                  schemaMap.put(schemaid, sqlMap);
              }
  
              sqlMap.put(cs.getSQL(), csid);
              sqlLookup.put(csid, cs.getSQL());
          }
  
          cs.setID(csid);
          csidMap.put(csid, cs);
  
          return csid;
      }