Examples with DocumentCodec org.bson.codecs.DocumentCodec used on opensource projects

Example 6 with DocumentCodec

use of org.bson.codecs.DocumentCodec in project drill by apache.

the class MongoGroupScan method getScanStats.

@Override
public ScanStats getScanStats() {
    try {
        MongoClient client = storagePlugin.getClient();
        MongoDatabase db = client.getDatabase(scanSpec.getDbName());
        MongoCollection<Document> collection = db.getCollection(scanSpec.getCollectionName());
        long numDocs = collection.count();
        float approxDiskCost = 0;
        if (numDocs != 0) {
            //toJson should use client's codec, otherwise toJson could fail on
            // some types not known to DocumentCodec, e.g. DBRef.
            final DocumentCodec codec = new DocumentCodec(client.getMongoClientOptions().getCodecRegistry(), new BsonTypeClassMap());
            String json = collection.find().first().toJson(codec);
            approxDiskCost = json.getBytes().length * numDocs;
        }
        return new ScanStats(GroupScanProperty.EXACT_ROW_COUNT, numDocs, 1, approxDiskCost);
    } catch (Exception e) {
        throw new DrillRuntimeException(e.getMessage(), e);
    }
}