Examples with CarbonFooterReaderV3 org.apache.carbondata.core.reader.CarbonFooterReaderV3 used on opensource projects

Example 1 with CarbonFooterReaderV3

use of org.apache.carbondata.core.reader.CarbonFooterReaderV3 in project carbondata by apache.

the class DataFileFooterConverterV3 method readDataFileFooter.

/**
   * Below method will be used to convert thrift file meta to wrapper file meta
   * This method will read the footer from footer offset present in the data file
   * 1. It will read the header from carbon data file, header starts from 0 offset
   * 2. It will set the stream offset
   * 3. It will read the footer data from file
   * 4. parse the footer to thrift object
   * 5. convert to wrapper object
   *
   * @param tableBlockInfo
   *        table block info
   * @return data file footer
   */
@Override
public DataFileFooter readDataFileFooter(TableBlockInfo tableBlockInfo) throws IOException {
    DataFileFooter dataFileFooter = new DataFileFooter();
    CarbonHeaderReader carbonHeaderReader = new CarbonHeaderReader(tableBlockInfo.getFilePath());
    FileHeader fileHeader = carbonHeaderReader.readHeader();
    CarbonFooterReaderV3 reader = new CarbonFooterReaderV3(tableBlockInfo.getFilePath(), tableBlockInfo.getBlockOffset());
    FileFooter3 footer = reader.readFooterVersion3();
    dataFileFooter.setVersionId(ColumnarFormatVersion.valueOf((short) fileHeader.getVersion()));
    dataFileFooter.setNumberOfRows(footer.getNum_rows());
    dataFileFooter.setSegmentInfo(getSegmentInfo(footer.getSegment_info()));
    dataFileFooter.setSchemaUpdatedTimeStamp(fileHeader.getTime_stamp());
    List<ColumnSchema> columnSchemaList = new ArrayList<ColumnSchema>();
    List<org.apache.carbondata.format.ColumnSchema> table_columns = fileHeader.getColumn_schema();
    for (int i = 0; i < table_columns.size(); i++) {
        columnSchemaList.add(thriftColumnSchmeaToWrapperColumnSchema(table_columns.get(i)));
    }
    dataFileFooter.setColumnInTable(columnSchemaList);
    List<org.apache.carbondata.format.BlockletIndex> leaf_node_indices_Thrift = footer.getBlocklet_index_list();
    List<BlockletIndex> blockletIndexList = new ArrayList<BlockletIndex>();
    for (int i = 0; i < leaf_node_indices_Thrift.size(); i++) {
        BlockletIndex blockletIndex = getBlockletIndex(leaf_node_indices_Thrift.get(i));
        blockletIndexList.add(blockletIndex);
    }
    List<org.apache.carbondata.format.BlockletInfo3> leaf_node_infos_Thrift = footer.getBlocklet_info_list3();
    List<BlockletInfo> blockletInfoList = new ArrayList<BlockletInfo>();
    for (int i = 0; i < leaf_node_infos_Thrift.size(); i++) {
        BlockletInfo blockletInfo = getBlockletInfo(leaf_node_infos_Thrift.get(i), getNumberOfDimensionColumns(columnSchemaList));
        blockletInfo.setBlockletIndex(blockletIndexList.get(i));
        blockletInfoList.add(blockletInfo);
    }
    dataFileFooter.setBlockletList(blockletInfoList);
    dataFileFooter.setBlockletIndex(getBlockletIndexForDataFileFooter(blockletIndexList));
    return dataFileFooter;
}