unparseTranslator = new UnparseTranslator();
autogenColAliasPrfxLbl = HiveConf.getVar(conf,
HiveConf.ConfVars.HIVE_AUTOGEN_COLUMNALIAS_PREFIX_LABEL);
autogenColAliasPrfxIncludeFuncName = HiveConf.getBoolVar(conf,
HiveConf.ConfVars.HIVE_AUTOGEN_COLUMNALIAS_PREFIX_INCLUDEFUNCNAME);
queryProperties = new QueryProperties();
opToPartToSkewedPruner = new HashMap<TableScanOperator, Map<String, ExprNodeDesc>>();
}