Examples with Metadata com.facebook.presto.orc.metadata.Metadata used on opensource projects

Example 1 with Metadata

use of com.facebook.presto.orc.metadata.Metadata in project presto by prestodb.

the class OrcWriter method bufferFileFooter.

/**
 * Collect the data for for the file footer.  This is not the actual data, but
 * instead are functions that know how to write the data.
 */
private List<DataOutput> bufferFileFooter() throws IOException {
    List<DataOutput> outputData = new ArrayList<>();
    Metadata metadata = new Metadata(closedStripes.stream().map(ClosedStripe::getStatistics).collect(toList()));
    Slice metadataSlice = metadataWriter.writeMetadata(metadata);
    outputData.add(createDataOutput(metadataSlice));
    numberOfRows = closedStripes.stream().mapToLong(stripe -> stripe.getStripeInformation().getNumberOfRows()).sum();
    List<ColumnStatistics> fileStats = toFileStats(closedStripes.stream().map(ClosedStripe::getStatistics).map(StripeStatistics::getColumnStatistics).collect(toList()));
    recordValidation(validation -> validation.setFileStatistics(fileStats));
    Map<String, Slice> userMetadata = this.userMetadata.entrySet().stream().collect(Collectors.toMap(Entry::getKey, entry -> utf8Slice(entry.getValue())));
    unencryptedStats = new ArrayList<>();
    Map<Integer, Map<Integer, Slice>> encryptedStats = new HashMap<>();
    addStatsRecursive(fileStats, 0, new HashMap<>(), unencryptedStats, encryptedStats);
    Optional<DwrfEncryption> dwrfEncryption;
    if (dwrfWriterEncryption.isPresent()) {
        ImmutableList.Builder<EncryptionGroup> encryptionGroupBuilder = ImmutableList.builder();
        List<WriterEncryptionGroup> writerEncryptionGroups = dwrfWriterEncryption.get().getWriterEncryptionGroups();
        for (int i = 0; i < writerEncryptionGroups.size(); i++) {
            WriterEncryptionGroup group = writerEncryptionGroups.get(i);
            Map<Integer, Slice> groupStats = encryptedStats.get(i);
            encryptionGroupBuilder.add(new EncryptionGroup(group.getNodes(), // reader will just use key metadata from the stripe
            Optional.empty(), group.getNodes().stream().map(groupStats::get).collect(toList())));
        }
        dwrfEncryption = Optional.of(new DwrfEncryption(dwrfWriterEncryption.get().getKeyProvider(), encryptionGroupBuilder.build()));
    } else {
        dwrfEncryption = Optional.empty();
    }
    Optional<DwrfStripeCacheData> dwrfStripeCacheData = dwrfStripeCacheWriter.map(DwrfStripeCacheWriter::getDwrfStripeCacheData);
    Slice dwrfStripeCacheSlice = metadataWriter.writeDwrfStripeCache(dwrfStripeCacheData);
    outputData.add(createDataOutput(dwrfStripeCacheSlice));
    Optional<List<Integer>> dwrfStripeCacheOffsets = dwrfStripeCacheWriter.map(DwrfStripeCacheWriter::getOffsets);
    Footer footer = new Footer(numberOfRows, rowGroupMaxRowCount, OptionalLong.of(rawSize), closedStripes.stream().map(ClosedStripe::getStripeInformation).collect(toList()), orcTypes, ImmutableList.copyOf(unencryptedStats), userMetadata, dwrfEncryption, dwrfStripeCacheOffsets);
    closedStripes.clear();
    closedStripesRetainedBytes = 0;
    Slice footerSlice = metadataWriter.writeFooter(footer);
    outputData.add(createDataOutput(footerSlice));
    recordValidation(validation -> validation.setVersion(metadataWriter.getOrcMetadataVersion()));
    Slice postscriptSlice = metadataWriter.writePostscript(footerSlice.length(), metadataSlice.length(), columnWriterOptions.getCompressionKind(), columnWriterOptions.getCompressionMaxBufferSize(), dwrfStripeCacheData);
    outputData.add(createDataOutput(postscriptSlice));
    outputData.add(createDataOutput(Slices.wrappedBuffer((byte) postscriptSlice.length())));
    return outputData;
}