public static boolean canCreateFromConf(Configuration conf) {
    return conf.get(TableScanDesc.FILTER_EXPR_CONF_STR) != null || conf.get(SARG_PUSHDOWN) != null;
  }
Do the recursive parse of the Hive ExprNodeDesc into our ExpressionTree.
@param expression the Hive ExprNodeDesc
ql/src/java/org/apache/hadoop/hive/ql/io/sarg/ConvertAstToSearchArg.java