docs: public static String getStmtTextForPlanHash(byte[] planHash) {
          Sha1Wrapper key = new Sha1Wrapper(planHash);
          FragInfo frag = null;
          synchronized (FragInfo.class) {
              frag = m_plansByHash.get(key);
          }
          assert(frag != null);
          // SQL statement text is not stored in the repository for ad hoc statements
          // -- it may be inaccurate because we parameterize the statement on its constants.
          // Callers know if they are asking about ad hoc or pre-planned fragments,
          // and shouldn't call this method for the ad hoc case.
          assert(frag.stmtText != null);
          return frag.stmtText;
      }