private void buildSelectListEvaluators() throws SemanticException, HiveException {
resultExprInfo = new ResultExprInfo();
resultExprInfo.resultExprEvals = new ArrayList<ExprNodeEvaluator>();
resultExprInfo.resultExprNames = new ArrayList<String>();
resultExprInfo.resultExprNodes = new ArrayList<ExprNodeDesc>();
// result
ArrayList<ObjectInspector> selectListExprOIs = new ArrayList<ObjectInspector>();
int i = 0;
for (WindowExpressionSpec expr : selectSpec) {
String selectColName = expr.getAlias();
ASTNode selectColumnNode = expr.getExpression();
ExprNodeDesc selectColumnExprNode =
ResultExpressionParser.buildExprNode(selectColumnNode, selectListInputTypeCheckCtx);
ExprNodeEvaluator selectColumnExprEval = ExprNodeEvaluatorFactory.get(selectColumnExprNode);
ObjectInspector selectColumnOI = null;
selectColumnOI = selectColumnExprEval.initialize(selectListInputOI);
selectColName = getColumnName(selectColName, selectColumnExprNode, i);
resultExprInfo.resultExprEvals.add(selectColumnExprEval);
selectListExprOIs.add(selectColumnOI);
resultExprInfo.resultExprNodes.add(selectColumnExprNode);
resultExprInfo.resultExprNames.add(selectColName);
i++;
}
resultExprInfo.resultOI =
ObjectInspectorFactory.getStandardStructObjectInspector(
resultExprInfo.resultExprNames, selectListExprOIs);
}
