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).initialize(conf, schema);
      return deserializer;
    } catch (Exception e) {
      LOG.error("error in initSerDe: " + e.getClass().getName() + " "
          + e.getMessage());

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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 rawRowObjectInspector = (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

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

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

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   */
  Operator genConversionSelectOperator(String dest, QB qb, Operator input,
      TableDesc table_desc, DynamicPartitionCtx dpCtx) 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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  private ArrayList<ExprNodeDesc> genConvertCol(String dest, QB qb, Table tab, TableDesc table_desc, Operator input,
                                                List<Integer> posns, boolean convert) 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);
    }


    List<? extends StructField> tableFields = oi.getAllStructFieldRefs();

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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(null, 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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