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).

  /**
   * Check if the given serde is valid
   */
  private void validateSerDe(String serdeName) throws HiveException {
    try {
      Deserializer d = SerDeUtils.lookupDeserializer(serdeName);
      if(d != null) {
        System.out.println("Found class for " + serdeName);
      }
    } catch (SerDeException e) {
      throw new HiveException ("Cannot validate serde: " + serdeName, e);

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    String tableName = String.valueOf(tblProps.getProperty("name"));
    String partName = String.valueOf(partSpec);
    //HiveConf.setVar(hconf, HiveConf.ConfVars.HIVETABLENAME, tableName);
    //HiveConf.setVar(hconf, HiveConf.ConfVars.HIVEPARTITIONNAME, partName);
    Deserializer deserializer = (Deserializer) sdclass.newInstance();
    deserializer.initialize(hconf, tblProps);
    StructObjectInspector rowObjectInspector = (StructObjectInspector)deserializer.getObjectInspector();


    MapOpCtx opCtx = null;
    // Next check if this table has partitions and if so
    // get the list of partition names as well as allocate
    // the serdes for the partition columns

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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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  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() + " " + 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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  /**
   * Return a deserializer object corresponding to the tableDesc
   */
  public Deserializer getDeserializer() throws Exception {
    Deserializer de = this.deserializerClass.newInstance();
    de.initialize(null, properties);
    return de;
  }

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   */
  Operator genConversionSelectOperator(String dest, QB qb,
      Operator input, tableDesc table_desc) throws SemanticException {
    StructObjectInspector oi = null;
    try {
      Deserializer deserializer = table_desc.getDeserializerClass().newInstance();
      deserializer.initialize(conf, table_desc.getProperties());
      oi = (StructObjectInspector) deserializer.getObjectInspector();
    } catch (Exception e) {
      throw new SemanticException(e);
    }


    // Check column number

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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)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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        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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