public String getFuncText() {
    return this.funcText;
  }
Create a ExprNodeGenericFuncDesc based on the genericUDFClass and the
children parameters. If the function has an explicit name, the
newInstance method should be passed the function name in the funcText
argument.

@throws UDFArgumentException
ql/src/java/org/apache/hadoop/hive/ql/plan/ExprNodeGenericFuncDesc.java