private void moveNext()

in core/src/main/java/org/apache/calcite/avatica/MetaImpl.java [1589:1631]

• 33 lines of code
• 9 McCabe index (conditional complexity)

    private void moveNext() {
      for (;;) {
        if (rows.hasNext()) {
          break;
        }
        if (frame.done) {
          rows = null;
          break;
        }
        try {
          // currentOffset updated after element is read from `rows` iterator
          frame = fetch(stmt.handle, currentOffset, fetchSize);
        } catch (NoSuchStatementException e) {
          resetStatement();
          // re-fetch the batch where we left off
          continue;
        } catch (MissingResultsException e) {
          try {
            // We saw the statement, but it didnt' have a resultset initialized. So, reset it.
            if (!stmt.syncResults(state, currentOffset)) {
              // This returned false, so there aren't actually any more results to iterate over
              frame = null;
              rows = null;
              break;
            }
            // syncResults returning true means we need to fetch those results
          } catch (NoSuchStatementException e1) {
            // Tried to reset the result set, but lost the statement, save a loop before retrying.
            resetStatement();
            // Will just loop back around to a MissingResultsException, but w/e recursion
          }
          // Kick back to the top to try to fetch again (in both branches)
          continue;
        }
        if (frame == null) {
          rows = null;
          break;
        }
        // It is valid for rows to be empty, so we go around the loop again to
        // check
        rows = frame.rows.iterator();
      }
    }