Examples of org.apache.hadoop.hive.serde2.Deserializer

org.apache.hadoop.hive.serde2.Deserializer
HiveDeserializer is used to deserialize the data from hadoop Writable to a custom java object that can be of any type that the developer wants. HiveDeserializer also provides the ObjectInspector which can be used to inspect the internal structure of the object (that is returned by deserialize function).

   *
   */
  static public Deserializer getDeserializer(Configuration conf, Properties schema) throws MetaException  {
    String lib = schema.getProperty(org.apache.hadoop.hive.serde.Constants.SERIALIZATION_LIB);
    try {
      Deserializer deserializer = SerDeUtils.lookupDeserializer(lib);
      ((Deserializer)deserializer).initialize(conf, schema);
      return deserializer;
    } catch (Exception e) {
      LOG.error("error in initSerDe: " + e.getClass().getName() + " " + e.getMessage());
      MetaStoreUtils.printStackTrace(e);

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   *
   */
  static public Deserializer getDeserializer(Configuration conf, org.apache.hadoop.hive.metastore.api.Table table) throws MetaException  {
    String lib = table.getSd().getSerdeInfo().getSerializationLib();
    try {
      Deserializer deserializer = SerDeUtils.lookupDeserializer(lib);
      deserializer.initialize(conf, MetaStoreUtils.getSchema(table));
      return deserializer;
    } catch (RuntimeException e) {
      throw e;
    } catch (Exception e) {
      LOG.error("error in initSerDe: " + e.getClass().getName() + " " + e.getMessage());

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  public Vector<StructField> getFields() {


    Vector<StructField> fields = new Vector<StructField> ();
    try {
      Deserializer decoder = getDeserializer();


      // Expand out all the columns of the table
      StructObjectInspector structObjectInspector = (StructObjectInspector)decoder.getObjectInspector();
      List<? extends StructField> fld_lst = structObjectInspector.getAllStructFieldRefs();
      for(StructField field: fld_lst) {
        fields.add(field);
      }
    } catch (SerDeException e) {

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        boolean isNative = SerDeUtils.isNativeSerDe(tbl.getSd().getSerdeInfo().getSerializationLib());
        if (isNative)
          return tbl.getSd().getCols();
        else {
          try {
            Deserializer s = MetaStoreUtils.getDeserializer(this.hiveConf, tbl);
            return MetaStoreUtils.getFieldsFromDeserializer(tableName, s);
          } catch(SerDeException e) {
            StringUtils.stringifyException(e);
            throw new MetaException(e.getMessage());
          }

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  public ObjectInspector getOutputObjectInspector() throws HiveException {
    try {
      ObjectInspector outInspector;
      if (work.getTblDir() != null) {
        tableDesc tbl = work.getTblDesc();
        Deserializer serde = tbl.getDeserializerClass().newInstance();
        serde.initialize(job, tbl.getProperties());
        return serde.getObjectInspector();
      }
      else {
        List<partitionDesc> listParts = work.getPartDesc();
        currPart = listParts.get(0);
        serde = currPart.getTableDesc().getDeserializerClass().newInstance();
        serde.initialize(job, currPart.getTableDesc().getProperties());
        setPrtnDesc();
        currPart = null;
        return rowObjectInspector;
      }
    } catch (Exception e) {

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            tbl.getSd().getSerdeInfo().getSerializationLib());
        if (!getColsFromSerDe) {
          ret = tbl.getSd().getCols();
        } else {
          try {
            Deserializer s = MetaStoreUtils.getDeserializer(hiveConf, tbl);
            ret = MetaStoreUtils.getFieldsFromDeserializer(tableName, s);
          } catch (SerDeException e) {
            StringUtils.stringifyException(e);
            throw new MetaException(e.getMessage());
          }

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  public ObjectInspector getOutputObjectInspector() throws HiveException {
    try {
      if (work.getTblDir() != null) {
        TableDesc tbl = work.getTblDesc();
        Deserializer serde = tbl.getDeserializerClass().newInstance();
        serde.initialize(job, tbl.getProperties());
        return serde.getObjectInspector();
      } else if (work.getPartDesc() != null) {
        List<PartitionDesc> listParts = work.getPartDesc();
        if(listParts.size() == 0) {
          return null;
        }
        currPart = listParts.get(0);
        serde = currPart.getTableDesc().getDeserializerClass().newInstance();
        serde.initialize(job, currPart.getTableDesc().getProperties());
        setPrtnDesc();
        currPart = null;
        return rowObjectInspector;
      } else {
        return null;

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  static public Deserializer getDeserializer(Configuration conf,
      Properties schema) throws MetaException {
    String lib = schema
        .getProperty(org.apache.hadoop.hive.serde.Constants.SERIALIZATION_LIB);
    try {
      Deserializer deserializer = SerDeUtils.lookupDeserializer(lib);
      (deserializer).initialize(conf, schema);
      return deserializer;
    } catch (Exception e) {
      LOG.error("error in initSerDe: " + e.getClass().getName() + " "
          + e.getMessage());

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    String lib = table.getSd().getSerdeInfo().getSerializationLib();
    if (lib == null) {
      return null;
    }
    try {
      Deserializer deserializer = SerDeUtils.lookupDeserializer(lib);
      deserializer.initialize(conf, MetaStoreUtils.getSchema(table));
      return deserializer;
    } catch (RuntimeException e) {
      throw e;
    } catch (Exception e) {
      LOG.error("error in initSerDe: " + e.getClass().getName() + " "

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  static public Deserializer getDeserializer(Configuration conf,
      org.apache.hadoop.hive.metastore.api.Partition part,
      org.apache.hadoop.hive.metastore.api.Table table) throws MetaException {
    String lib = part.getSd().getSerdeInfo().getSerializationLib();
    try {
      Deserializer deserializer = SerDeUtils.lookupDeserializer(lib);
      deserializer.initialize(conf, MetaStoreUtils.getSchema(part, table));
      return deserializer;
    } catch (RuntimeException e) {
      throw e;
    } catch (Exception e) {
      LOG.error("error in initSerDe: " + e.getClass().getName() + " "

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