private Configuration unsetNestedColumnPaths(Configuration conf) {
    if (conf.get(ColumnProjectionUtils.READ_NESTED_COLUMN_PATH_CONF_STR) != null) {
      Configuration confCopy = new Configuration(conf);
      confCopy.unset(ColumnProjectionUtils.READ_NESTED_COLUMN_PATH_CONF_STR);
      return confCopy;
    }
    return conf;
  }
Check if nested column paths is set for 'conf'.
If set, create a copy of 'conf' with this property unset.
ql/src/java/org/apache/hadoop/hive/ql/exec/FileSinkOperator.java