private String makeOneCol(ColumnDesc col) {
    String res = String.format("%s %s", col.name, col.type);
    if (TempletonUtils.isset(col.comment))
      res += String.format(" comment '%s'", col.comment);
    return res;
  }
Return a json "show table extended like" with extra info from "desc exteded"
This will return table with exact name match.
hcatalog/webhcat/svr/src/main/java/org/apache/hive/hcatalog/templeton/HcatDelegator.java