public PTFExpressionDef buildExpressionDef(ShapeDetails inpShape, ASTNode arg)
      throws HiveException {
    PTFExpressionDef argDef = new PTFExpressionDef();

    ExprNodeDesc exprNode = semAly.genExprNodeDesc(arg, inpShape.getRr(),
        inpShape.getTypeCheckCtx());
    ExprNodeEvaluator exprEval = WindowingExprNodeEvaluatorFactory.get(llInfo, exprNode);
    ObjectInspector oi = initExprNodeEvaluator(exprEval, exprNode, inpShape);

    argDef.setExpressionTreeString(arg.toStringTree());
    argDef.setExprNode(exprNode);
    argDef.setExprEvaluator(exprEval);
    argDef.setOI(oi);
    return argDef;
  }
Collect order expressions for RANGE based windowing
@throws SemanticException
ql/src/java/org/apache/hadoop/hive/ql/parse/PTFTranslator.java