@GET
  @Path("ddl/database/{db}/table/{table}/column/{column}")
  @Produces(MediaType.APPLICATION_JSON)
  public Response descColumn(@PathParam("db") String db,
                 @PathParam("table") String table,
                 @PathParam("column") String column)
    throws SimpleWebException, NotAuthorizedException, BusyException,
    BadParam, ExecuteException, IOException {
    verifyUser();
    verifyDdlParam(db, ":db");
    verifyDdlParam(table, ":table");
    verifyParam(column, ":column");

    HcatDelegator d = new HcatDelegator(appConf, execService);
    return d.descOneColumn(getDoAsUser(), db, table, column);
  }
Describe a single column in an hcat table.
hcatalog/webhcat/svr/src/main/java/org/apache/hive/hcatalog/templeton/Server.java