public static void setReadColumns(Configuration conf, List<Integer> ids) {
    setReadColumnIDConf(conf, READ_COLUMN_IDS_CONF_STR_DEFAULT);
    appendReadColumns(conf, ids);
  }
Sets the <em>READ_ALL_COLUMNS</em> flag to false and overwrites column ids
with the provided list.
serde/src/java/org/apache/hadoop/hive/serde2/ColumnProjectionUtils.java