code: public static boolean hasColumn(Schema schema, String columnName)
      {
          try
          {
              schema.getColumn(columnName);
              return true;
          }
          catch (IllegalArgumentException e)
          {
              return false;
          }
      }
docs: Checks for column.
  
  @param schema
  the schema
  @param columnName
  the column name
  @return true, if successful