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.");
      }

View Full Code Here

            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));
        }

View Full Code Here

        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));

View Full Code Here

        return "Column " + expr.getExprString() + " is not string "
          + (isIntegralSupported ? "or integral ": "") + "type: " + type.getTypeName();
     }
    } else if (expr instanceof ExprNodeGenericFuncDesc) {
      ExprNodeGenericFuncDesc funcDesc = (ExprNodeGenericFuncDesc) expr;
      GenericUDF func = funcDesc.getGenericUDF();
      if (!supportedJDOFuncs(func)) {
        return "Expression " + expr.getExprString() + " cannot be evaluated";
      }
      boolean allChildrenConstant = true;
      List<ExprNodeDesc> children = funcDesc.getChildExprs();

View Full Code Here

      if (nodeEvaluator instanceof ExprNodeGenericFuncEvaluator) {
        if (((ExprNodeGenericFuncEvaluator) nodeEvaluator).isEager) {
          isEager = true;
        }
        // Base case:  we are eager if a child is stateful
        GenericUDF childUDF =
          ((ExprNodeGenericFuncDesc) child).getGenericUDF();
        if (FunctionRegistry.isStateful(childUDF)) {
          isEager = true;
        }
      }

View Full Code Here

        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));

View Full Code Here

      if (nodeEvaluator instanceof ExprNodeGenericFuncEvaluator) {
        if (((ExprNodeGenericFuncEvaluator) nodeEvaluator).isEager) {
          isEager = true;
        }
        // Base case:  we are eager if a child is stateful
        GenericUDF childUDF =
          ((ExprNodeGenericFuncDesc) child).getGenericUDF();
        if (FunctionRegistry.isStateful(childUDF)) {
          isEager = true;
        }
      }

View Full Code Here

      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.");
      }

View Full Code Here

     } else {
       return false;
     }
    } else if (expr instanceof ExprNodeGenericFuncDesc) {
      ExprNodeGenericFuncDesc funcDesc = (ExprNodeGenericFuncDesc) expr;
      GenericUDF func = funcDesc.getGenericUDF();
      if (!supportedJDOFuncs(func)) {
        return false;
      }
      List<ExprNodeDesc> children = funcDesc.getChildExprs();
      for (ExprNodeDesc child: children) {

View Full Code Here

      FunctionInfo fi = FunctionRegistry.getFunctionInfo(udfName);
      if (fi == null) {
        throw new UDFArgumentException("udf:" + udfName + " not found.");
      }
      
      GenericUDF genericUDF = fi.getGenericUDF();
      if (genericUDF == null) {
        throw new UDFArgumentException("udf:" + udfName + " is an aggregation function.");
      }


      return exprNodeGenericFuncDesc.newInstance(genericUDF, children);

View Full Code Here

0 1 2 3 4 5 6 7 8

TOP

Related Classes of org.apache.hadoop.hive.ql.udf.generic.GenericUDF

com.sap.hadoop.windowing.query2.translate.WindowingExprNodeEvaluatorFactory$FindLeadLagFuncExprs

com.sap.hadoop.windowing.query2.translate.WindowingTypeCheckProcFactory$DefaultExprProcessor

org.apache.drill.exec.expr.fn.HiveFunctionRegistry

org.apache.hadoop.hive.accumulo.predicate.AccumuloRangeGenerator

org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator

org.apache.hadoop.hive.ql.exec.Utilities

org.apache.hadoop.hive.ql.exec.vector.TestVectorizationContext

org.apache.hadoop.hive.ql.exec.vector.TestVectorSelectOperator

org.apache.hadoop.hive.ql.exec.vector.udf.TestVectorUDFAdaptor

org.apache.hadoop.hive.ql.index.IndexPredicateAnalyzer

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.