Examples of org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc

org.apache.hadoop.hive.ql.plan.exprNodeGenericFuncDesc
Describes a GenericFunc node.

      // if we don't know the expression, just assume maybe
      if (expression.getClass() != ExprNodeGenericFuncDesc.class) {
        return new ExpressionTree(TruthValue.YES_NO_NULL);
      }
      // get the kind of expression
      ExprNodeGenericFuncDesc expr = (ExprNodeGenericFuncDesc) expression;
      Class<?> op = expr.getGenericUDF().getClass();
      ExpressionTree result;


      // handle the logical operators
      if (op == GenericUDFOPOr.class) {
        result = new ExpressionTree(ExpressionTree.Operator.OR);

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        LOG.debug("Cannot vectorize " + desc.toString() + " of type " + typeName);
      }
      return false;
    }
    if (desc instanceof ExprNodeGenericFuncDesc) {
      ExprNodeGenericFuncDesc d = (ExprNodeGenericFuncDesc) desc;
      boolean r = validateGenericUdf(d);
      if (!r) {
        return false;
      }
    }

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                  ErrorMsg.INVALID_ARRAYINDEX_CONSTANT.getMsg()));
          }


          // Calculate TypeInfo
          TypeInfo t = ((ListTypeInfo) myt).getListElementTypeInfo();
          desc = new ExprNodeGenericFuncDesc(t, FunctionRegistry
              .getGenericUDFForIndex(), children);
        } else if (myt.getCategory() == Category.MAP) {
          // Only allow constant map key for now
          if (!(children.get(1) instanceof ExprNodeConstantDesc)) {
            throw new SemanticException(SemanticAnalyzer.generateErrorMessage(
                  expr,
                  ErrorMsg.INVALID_MAPINDEX_CONSTANT.getMsg()));
          }
          if (!(((ExprNodeConstantDesc) children.get(1)).getTypeInfo()
              .equals(((MapTypeInfo) myt).getMapKeyTypeInfo()))) {
            throw new SemanticException(ErrorMsg.INVALID_MAPINDEX_TYPE
                .getMsg(expr));
          }
          // Calculate TypeInfo
          TypeInfo t = ((MapTypeInfo) myt).getMapValueTypeInfo();
          desc = new ExprNodeGenericFuncDesc(t, FunctionRegistry
              .getGenericUDFForIndex(), children);
        } else {
          throw new SemanticException(ErrorMsg.NON_COLLECTION_TYPE.getMsg(expr,
              myt.getTypeName()));
        }

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    private long evaluateExpression(Statistics stats, ExprNodeDesc pred,
        AnnotateStatsProcCtx aspCtx, List<String> neededCols) throws CloneNotSupportedException {
      long newNumRows = 0;
      Statistics andStats = null;
      if (pred instanceof ExprNodeGenericFuncDesc) {
        ExprNodeGenericFuncDesc genFunc = (ExprNodeGenericFuncDesc) pred;
        GenericUDF udf = genFunc.getGenericUDF();


        // for AND condition cascadingly update stats
        if (udf instanceof GenericUDFOPAnd) {
          andStats = stats.clone();
          aspCtx.setAndExprStats(andStats);


          // evaluate children
          for (ExprNodeDesc child : genFunc.getChildren()) {
            newNumRows = evaluateChildExpr(aspCtx.getAndExprStats(), child, aspCtx, neededCols);
            if (satisfyPrecondition(aspCtx.getAndExprStats())) {
              updateStats(aspCtx.getAndExprStats(), newNumRows, true);
            } else {
              updateStats(aspCtx.getAndExprStats(), newNumRows, false);
            }
          }
        } else if (udf instanceof GenericUDFOPOr) {
          // for OR condition independently compute and update stats
          for (ExprNodeDesc child : genFunc.getChildren()) {
            newNumRows += evaluateChildExpr(stats, child, aspCtx, neededCols);
          }
        } else if (udf instanceof GenericUDFOPNot) {
          newNumRows = evaluateNotExpr(stats, pred, aspCtx, neededCols);
        } else {

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      long numRows = stats.getNumRows();


      // if the evaluate yields true then pass all rows else pass 0 rows
      if (pred instanceof ExprNodeGenericFuncDesc) {
        ExprNodeGenericFuncDesc genFunc = (ExprNodeGenericFuncDesc) pred;
        for (ExprNodeDesc leaf : genFunc.getChildren()) {
          if (leaf instanceof ExprNodeGenericFuncDesc) {


            // GenericUDF
            long newNumRows = 0;
            for (ExprNodeDesc child : ((ExprNodeGenericFuncDesc) pred).getChildren()) {

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      long numRows = stats.getNumRows();


      // evaluate similar to "col = constant" expr
      if (pred instanceof ExprNodeGenericFuncDesc) {


        ExprNodeGenericFuncDesc genFunc = (ExprNodeGenericFuncDesc) pred;
        for (ExprNodeDesc leaf : genFunc.getChildren()) {


          if (leaf instanceof ExprNodeColumnDesc) {
            ExprNodeColumnDesc colDesc = (ExprNodeColumnDesc) leaf;
            String colName = colDesc.getColumn();
            String tabAlias = colDesc.getTabAlias();

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            throw new SemanticException(ErrorMsg.INVALID_ARRAYINDEX_CONSTANT.getMsg(expr));
          }
        
          // Calculate TypeInfo
          TypeInfo t = ((ListTypeInfo)myt).getListElementTypeInfo();
          desc = new exprNodeGenericFuncDesc(t, 
              FunctionRegistry.getGenericUDFForIndex(),
              children);
        }
        else if (myt.getCategory() == Category.MAP) {
          // Only allow only constant indexes for now
          if (!(children.get(1) instanceof exprNodeConstantDesc)) {
            throw new SemanticException(ErrorMsg.INVALID_MAPINDEX_CONSTANT.getMsg(expr));
          }
          if (!(((exprNodeConstantDesc)children.get(1)).getTypeInfo().equals( 
              ((MapTypeInfo)myt).getMapKeyTypeInfo()))) {
            throw new SemanticException(ErrorMsg.INVALID_MAPINDEX_TYPE.getMsg(expr));
          }
          // Calculate TypeInfo
          TypeInfo t = ((MapTypeInfo)myt).getMapValueTypeInfo();
          desc = new exprNodeGenericFuncDesc(t, 
              FunctionRegistry.getGenericUDFForIndex(),
              children);
        }
        else {
          throw new SemanticException(ErrorMsg.NON_COLLECTION_TYPE.getMsg(expr,

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      for(; i < preds.size(); i++) {
        List<exprNodeDesc> children = new ArrayList<exprNodeDesc>(2);
        children.add(condn);
        children.add((exprNodeDesc) preds.get(i));
        condn = new exprNodeGenericFuncDesc(
                                            TypeInfoFactory.booleanTypeInfo,
                                            FunctionRegistry.getGenericUDFForAnd(),
                                            children
                                            );
      }

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    @Override
    public Object process(Node nd, Stack<Node> stack, NodeProcessorCtx procCtx,
        Object... nodeOutputs) throws SemanticException {
      ExprWalkerInfo ctx = (ExprWalkerInfo) procCtx;
      String alias = null;
      exprNodeGenericFuncDesc expr = (exprNodeGenericFuncDesc) nd;


      
      if (!FunctionRegistry.isDeterministic(expr.getGenericUDF())) {
        // this GenericUDF can't be pushed down
        ctx.setIsCandidate(expr, false);
        ctx.setDeterministic(false);
        return false;
      }
      
      boolean isCandidate = true;
      for (int i=0; i < nd.getChildren().size(); i++) {
        exprNodeDesc ch = (exprNodeDesc) nd.getChildren().get(i);
        exprNodeDesc newCh = ctx.getConvertedNode(ch);
        if (newCh != null) {
          expr.getChildExprs().set(i, newCh);
          ch = newCh;
        }
        String chAlias = ctx.getAlias(ch);
        
        isCandidate = isCandidate && ctx.isCandidate(ch);

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   */
  private static Class<? extends UDF> getUDFClassFromExprDesc(exprNodeDesc desc) {
    if (!(desc instanceof exprNodeGenericFuncDesc)) {
      return null;
    }
    exprNodeGenericFuncDesc genericFuncDesc = (exprNodeGenericFuncDesc)desc;
    if (!(genericFuncDesc.getGenericUDF() instanceof GenericUDFBridge)) {
      return null;
    }
    GenericUDFBridge bridge = (GenericUDFBridge)(genericFuncDesc.getGenericUDF());
    return bridge.getUdfClass();
  }

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