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

Example 6 with CarbonFooterReader

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

the class DataFileFooterConverter method getSchema.

@Override
public List<ColumnSchema> getSchema(TableBlockInfo tableBlockInfo) throws IOException {
    FileReader fileReader = null;
    List<ColumnSchema> columnSchemaList = new ArrayList<ColumnSchema>();
    try {
        long completeBlockLength = tableBlockInfo.getBlockLength();
        long footerPointer = completeBlockLength - 8;
        fileReader = FileFactory.getFileHolder(FileFactory.getFileType(tableBlockInfo.getFilePath()));
        long actualFooterOffset = fileReader.readLong(tableBlockInfo.getFilePath(), footerPointer);
        CarbonFooterReader reader = new CarbonFooterReader(tableBlockInfo.getFilePath(), actualFooterOffset);
        FileFooter footer = reader.readFooter();
        List<org.apache.carbondata.format.ColumnSchema> table_columns = footer.getTable_columns();
        for (int i = 0; i < table_columns.size(); i++) {
            columnSchemaList.add(thriftColumnSchmeaToWrapperColumnSchema(table_columns.get(i)));
        }
    } finally {
        if (null != fileReader) {
            fileReader.finish();
        }
    }
    return columnSchemaList;
}