private String makeCols(List<ColumnDesc> cols) {
    ArrayList<String> res = new ArrayList<String>();
    for (ColumnDesc col : cols)
      res.add(makeOneCol(col));
    return StringUtils.join(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