Examples of org.apache.hadoop.hive.ql.udf.generic.GenericUDF

Package org.apache.hadoop.hive.ql.udf.generic

Examples of org.apache.hadoop.hive.ql.udf.generic.GenericUDF

org.apache.hadoop.hive.ql.udf.generic.GenericUDF
A Generic User-defined function (GenericUDF) for the use with Hive. New GenericUDF classes need to inherit from this GenericUDF class. The GenericUDF are superior to normal UDFs in the following ways: 1. It can accept arguments of complex types, and return complex types. 2. It can accept variable length of arguments. 3. It can accept an infinite number of function signature - for example, it's easy to write a GenericUDF that accepts array, array> and so on (arbitrary levels of nesting). 4. It can do short-circuit evaluations using DeferedObject.

      FunctionInfo fi = FunctionRegistry.getFunctionInfo(udfName);
      if (fi == null) {
        throw new UDFArgumentException(udfName + " not found.");
      }


      GenericUDF genericUDF = fi.getGenericUDF();
      if (genericUDF == null) {
        throw new UDFArgumentException(udfName
            + " is an aggregation function or a table function.");
      }

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            throw new SemanticException(ErrorMsg.INVALID_FUNCTION.getMsg(expr));
          }
        }


        // getGenericUDF() actually clones the UDF. Just call it once and reuse.
        GenericUDF genericUDF = fi.getGenericUDF();


        if (!fi.isNative()) {
          ctx.getUnparseTranslator().addIdentifierTranslation(
              (ASTNode) expr.getChild(0));
        }

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        return null;
      } else {
        return expr;
      }
    } else if (expr instanceof ExprNodeGenericFuncDesc) {
      GenericUDF udf = ((ExprNodeGenericFuncDesc)expr).getGenericUDF();
      boolean isAnd = udf instanceof GenericUDFOPAnd;
      if (isAnd || udf instanceof GenericUDFOPOr) {
        List<ExprNodeDesc> children = expr.getChildren();
        ExprNodeDesc left = children.get(0);
        children.set(0, compactExpr(left));

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    ExprNodeConstantDesc folded = foldConstant(((ExprNodeGenericFuncDesc) expr));
    return folded == null ? expr : folded;
  }


  private ExprNodeConstantDesc foldConstant(ExprNodeGenericFuncDesc func) {
    GenericUDF udf = func.getGenericUDF();
    if (!FunctionRegistry.isDeterministic(udf) || FunctionRegistry.isStateful(udf)) {
      return null;
    }
    try {
      // If the UDF depends on any external resources, we can't fold because the
      // resources may not be available at compile time.
      if (udf instanceof GenericUDFBridge) {
        UDF internal = ReflectionUtils.newInstance(((GenericUDFBridge) udf).getUdfClass(), null);
        if (internal.getRequiredFiles() != null || internal.getRequiredJars() != null) {
          return null;
        }
      } else {
        if (udf.getRequiredFiles() != null || udf.getRequiredJars() != null) {
          return null;
        }
      }


      for (ExprNodeDesc child : func.getChildExprs()) {

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      this.topExpr = topExpr;
    }


    public void visit(ExprNodeGenericFuncDesc fnExpr) throws HiveException
    {
      GenericUDF fn = fnExpr.getGenericUDF();
      if (fn instanceof GenericUDFLead || fn instanceof GenericUDFLag )
      {
        llInfo.addLLFuncExprForTopExpr(topExpr, fnExpr);
      }
    }

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        return null;
      } else {
        return expr;
      }
    } else if (expr instanceof ExprNodeGenericFuncDesc) {
      GenericUDF udf = ((ExprNodeGenericFuncDesc)expr).getGenericUDF();
      if (udf instanceof GenericUDFOPAnd ||
          udf instanceof GenericUDFOPOr) {
        List<ExprNodeDesc> children = ((ExprNodeGenericFuncDesc)expr).getChildren();
        ExprNodeDesc left = children.get(0);
        children.set(0, compactExpr(left));

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      FunctionInfo fi = FunctionRegistry.getFunctionInfo(udfName);
      if (fi == null) {
        throw new UDFArgumentException(udfName + " not found.");
      }


      GenericUDF genericUDF = fi.getGenericUDF();
      if (genericUDF == null) {
        throw new UDFArgumentException(udfName
            + " is an aggregation function or a table function.");
      }

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        ExprNodeDesc node = joinKeys.remove(0);
        if (node instanceof ExprNodeColumnDesc) {
          joinCols.addAll(node.getCols());
        } else if (node instanceof ExprNodeGenericFuncDesc) {
          ExprNodeGenericFuncDesc udfNode = ((ExprNodeGenericFuncDesc) node);
          GenericUDF udf = udfNode.getGenericUDF();
          if (!FunctionRegistry.isDeterministic(udf)) {
            return false;
          }
          joinKeys.addAll(0, udfNode.getChildExprs());
        } else {

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      FunctionInfo fi = FunctionRegistry.getFunctionInfo(udfName);
      if (fi == null) {
        throw new UDFArgumentException(udfName + " not found.");
      }


      GenericUDF genericUDF = fi.getGenericUDF();
      if (genericUDF == null) {
        throw new UDFArgumentException(udfName
            + " is an aggregation function or a table function.");
      }

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