Examples with RecordReader org.apache.drill.exec.store.RecordReader used on opensource projects

Example 11 with RecordReader

use of org.apache.drill.exec.store.RecordReader in project drill by apache.

the class EasyFormatPlugin method getReaderBatch.

@SuppressWarnings("resource")
CloseableRecordBatch getReaderBatch(FragmentContext context, EasySubScan scan) throws ExecutionSetupException {
    final ImplicitColumnExplorer columnExplorer = new ImplicitColumnExplorer(context, scan.getColumns());
    if (!columnExplorer.isStarQuery()) {
        scan = new EasySubScan(scan.getUserName(), scan.getWorkUnits(), scan.getFormatPlugin(), columnExplorer.getTableColumns(), scan.getSelectionRoot());
        scan.setOperatorId(scan.getOperatorId());
    }
    OperatorContext oContext = context.newOperatorContext(scan);
    final DrillFileSystem dfs;
    try {
        dfs = oContext.newFileSystem(fsConf);
    } catch (IOException e) {
        throw new ExecutionSetupException(String.format("Failed to create FileSystem: %s", e.getMessage()), e);
    }
    List<RecordReader> readers = Lists.newArrayList();
    List<Map<String, String>> implicitColumns = Lists.newArrayList();
    Map<String, String> mapWithMaxColumns = Maps.newLinkedHashMap();
    for (FileWork work : scan.getWorkUnits()) {
        RecordReader recordReader = getRecordReader(context, dfs, work, scan.getColumns(), scan.getUserName());
        readers.add(recordReader);
        Map<String, String> implicitValues = columnExplorer.populateImplicitColumns(work, scan.getSelectionRoot());
        implicitColumns.add(implicitValues);
        if (implicitValues.size() > mapWithMaxColumns.size()) {
            mapWithMaxColumns = implicitValues;
        }
    }
    // all readers should have the same number of implicit columns, add missing ones with value null
    Map<String, String> diff = Maps.transformValues(mapWithMaxColumns, Functions.constant((String) null));
    for (Map<String, String> map : implicitColumns) {
        map.putAll(Maps.difference(map, diff).entriesOnlyOnRight());
    }
    return new ScanBatch(scan, context, oContext, readers.iterator(), implicitColumns);
}

Example 12 with RecordReader

use of org.apache.drill.exec.store.RecordReader in project drill by apache.

the class HiveScanBatchCreator method getBatch.

@Override
public ScanBatch getBatch(FragmentContext context, HiveSubScan config, List<RecordBatch> children) throws ExecutionSetupException {
    List<RecordReader> readers = Lists.newArrayList();
    HiveTableWithColumnCache table = config.getTable();
    List<InputSplit> splits = config.getInputSplits();
    List<HivePartition> partitions = config.getPartitions();
    boolean hasPartitions = (partitions != null && partitions.size() > 0);
    int i = 0;
    final UserGroupInformation proxyUgi = ImpersonationUtil.createProxyUgi(config.getUserName(), context.getQueryUserName());
    final HiveConf hiveConf = config.getHiveConf();
    final String formatName = table.getSd().getInputFormat();
    Class<? extends HiveAbstractReader> readerClass = HiveDefaultReader.class;
    if (readerMap.containsKey(formatName)) {
        readerClass = readerMap.get(formatName);
    }
    Constructor<? extends HiveAbstractReader> readerConstructor = null;
    try {
        readerConstructor = readerClass.getConstructor(HiveTableWithColumnCache.class, HivePartition.class, InputSplit.class, List.class, FragmentContext.class, HiveConf.class, UserGroupInformation.class);
        for (InputSplit split : splits) {
            readers.add(readerConstructor.newInstance(table, (hasPartitions ? partitions.get(i++) : null), split, config.getColumns(), context, hiveConf, proxyUgi));
        }
        if (readers.size() == 0) {
            readers.add(readerConstructor.newInstance(table, null, null, config.getColumns(), context, hiveConf, proxyUgi));
        }
    } catch (Exception e) {
        logger.error("No constructor for {}, thrown {}", readerClass.getName(), e);
    }
    return new ScanBatch(config, context, readers.iterator());
}