Examples of org.apache.hadoop.hive.ql.exec.UDF

org.apache.hadoop.hive.ql.exec.UDF
A User-defined function (UDF) for the use with Hive. New UDF classes need to inherit from this UDF class. Required for all UDF classes: 1. Implement one or more methods named "evaluate" which will be called by Hive. The following are some examples: public int evaluate(); public int evaluate(int a); public double evaluate(int a, double b); public String evaluate(String a, int b, String c); "evaluate" should never be a void method. However it can return "null" if needed.

    }
    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;

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    }
    return HiveDecimalUtils.getPrecisionForType(typeInfo);
  }


  private GenericUDF getGenericUDFForCast(TypeInfo castType) throws HiveException {
    UDF udfClass = null;
    GenericUDF genericUdf = null;
    switch (((PrimitiveTypeInfo) castType).getPrimitiveCategory()) {
      case BYTE:
        udfClass = new UDFToByte();
        break;
      case SHORT:
        udfClass = new UDFToShort();
        break;
      case INT:
        udfClass = new UDFToInteger();
        break;
      case LONG:
        udfClass = new UDFToLong();
        break;
      case FLOAT:
        udfClass = new UDFToFloat();
        break;
      case DOUBLE:
        udfClass = new UDFToDouble();
        break;
      case STRING:
        udfClass = new UDFToString();
        break;
      case BOOLEAN:
        udfClass = new UDFToBoolean();
        break;
      case DATE:
        genericUdf = new GenericUDFToDate();
        break;
      case TIMESTAMP:
        genericUdf = new GenericUDFToUnixTimeStamp();
        break;
      case BINARY:
        genericUdf = new GenericUDFToBinary();
        break;
      case DECIMAL:
        genericUdf = new GenericUDFToDecimal();
        break;
    }
    if (genericUdf == null) {
      if (udfClass == null) {
        throw new HiveException("Could not add implicit cast for type "+castType.getTypeName());
      }
      genericUdf = new GenericUDFBridge();
      ((GenericUDFBridge) genericUdf).setUdfClassName(udfClass.getClass().getName());
    }
    if (genericUdf instanceof SettableUDF) {
  ((SettableUDF)genericUdf).setTypeInfo(castType);
    }    
    return genericUdf;

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    }
    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;

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    }
    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;

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    String[] jars;
    if (udf instanceof GenericUDFBridge) {
      GenericUDFBridge bridge = (GenericUDFBridge) udf;
      String udfClassName = bridge.getUdfClassName();
      try {
        UDF udfInternal =
            (UDF) Class.forName(bridge.getUdfClassName(), true, Utilities.getSessionSpecifiedClassLoader())
                .newInstance();
        files = udfInternal.getRequiredFiles();
        jars = udfInternal.getRequiredJars();
      } catch (Exception e) {
        LOG.error("The UDF implementation class '" + udfClassName
            + "' is not present in the class path");
        return false;
      }

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    }
    return HiveDecimalUtils.getPrecisionForType(typeInfo);
  }


  private GenericUDF getGenericUDFForCast(TypeInfo castType) throws HiveException {
    UDF udfClass = null;
    GenericUDF genericUdf = null;
    switch (((PrimitiveTypeInfo) castType).getPrimitiveCategory()) {
      case BYTE:
        udfClass = new UDFToByte();
        break;
      case SHORT:
        udfClass = new UDFToShort();
        break;
      case INT:
        udfClass = new UDFToInteger();
        break;
      case LONG:
        udfClass = new UDFToLong();
        break;
      case FLOAT:
        udfClass = new UDFToFloat();
        break;
      case DOUBLE:
        udfClass = new UDFToDouble();
        break;
      case STRING:
        udfClass = new UDFToString();
        break;
      case CHAR:
        genericUdf = new GenericUDFToChar();
        break;
      case VARCHAR:
        genericUdf = new GenericUDFToVarchar();
        break;
      case BOOLEAN:
        udfClass = new UDFToBoolean();
        break;
      case DATE:
        genericUdf = new GenericUDFToDate();
        break;
      case TIMESTAMP:
        genericUdf = new GenericUDFToUnixTimeStamp();
        break;
      case BINARY:
        genericUdf = new GenericUDFToBinary();
        break;
      case DECIMAL:
        genericUdf = new GenericUDFToDecimal();
        break;
    }
    if (genericUdf == null) {
      if (udfClass == null) {
        throw new HiveException("Could not add implicit cast for type "+castType.getTypeName());
      }
      genericUdf = new GenericUDFBridge();
      ((GenericUDFBridge) genericUdf).setUdfClassName(udfClass.getClass().getName());
    }
    if (genericUdf instanceof SettableUDF) {
      ((SettableUDF) genericUdf).setTypeInfo(castType);
    }
    return genericUdf;

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    }
    return HiveDecimalUtils.getPrecisionForType(typeInfo);
  }


  private GenericUDF getGenericUDFForCast(TypeInfo castType) throws HiveException {
    UDF udfClass = null;
    GenericUDF genericUdf = null;
    switch (((PrimitiveTypeInfo) castType).getPrimitiveCategory()) {
      case BYTE:
        udfClass = new UDFToByte();
        break;
      case SHORT:
        udfClass = new UDFToShort();
        break;
      case INT:
        udfClass = new UDFToInteger();
        break;
      case LONG:
        udfClass = new UDFToLong();
        break;
      case FLOAT:
        udfClass = new UDFToFloat();
        break;
      case DOUBLE:
        udfClass = new UDFToDouble();
        break;
      case STRING:
        udfClass = new UDFToString();
        break;
      case BOOLEAN:
        udfClass = new UDFToBoolean();
        break;
      case DATE:
        genericUdf = new GenericUDFToDate();
        break;
      case TIMESTAMP:
        genericUdf = new GenericUDFToUnixTimeStamp();
        break;
      case BINARY:
        genericUdf = new GenericUDFToBinary();
        break;
      case DECIMAL:
        genericUdf = new GenericUDFToDecimal();
        break;
    }
    if (genericUdf == null) {
      if (udfClass == null) {
        throw new HiveException("Could not add implicit cast for type "+castType.getTypeName());
      }
      genericUdf = new GenericUDFBridge();
      ((GenericUDFBridge) genericUdf).setUdfClassName(udfClass.getClass().getName());
    }
    if (genericUdf instanceof SettableUDF) {
  ((SettableUDF)genericUdf).setTypeInfo(castType);
    }    
    return genericUdf;

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    }
    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;

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