Examples of DefaultGraphWalker


Examples of org.apache.hadoop.hive.ql.lib.DefaultGraphWalker

    // The dispatcher fires the processor corresponding to the closest matching
    // rule and passes the context along
    Dispatcher disp = new DefaultRuleDispatcher(getDefaultExprProcessor(),
        exprRules, exprContext);
    GraphWalker egw = new DefaultGraphWalker(disp);

    List<Node> startNodes = new ArrayList<Node>();
    List<ExprNodeDesc> clonedPreds = new ArrayList<ExprNodeDesc>();
    for (ExprNodeDesc node : preds) {
      ExprNodeDesc clone = node.clone();
      clonedPreds.add(clone);
      exprContext.getNewToOldExprMap().put(clone, node);
    }
    startNodes.addAll(clonedPreds);

    egw.startWalking(startNodes, null);

    HiveConf conf = opContext.getParseContext().getConf();
    // check the root expression for final candidates
    for (ExprNodeDesc pred : clonedPreds) {
      extractFinalCandidates(pred, exprContext, conf);
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