Examples with SegmentMetadataQueryBuilder org.apache.druid.query.Druids.SegmentMetadataQueryBuilder used on opensource projects

Example 1 with SegmentMetadataQueryBuilder

use of org.apache.druid.query.Druids.SegmentMetadataQueryBuilder in project hive by apache.

the class DruidSerDe method initFromMetaDataQuery.

private void initFromMetaDataQuery(final Configuration configuration, final Properties properties) throws SerDeException {
    final List<String> columnNames = new ArrayList<>();
    final List<PrimitiveTypeInfo> columnTypes = new ArrayList<>();
    final List<ObjectInspector> inspectors = new ArrayList<>();
    String dataSource = properties.getProperty(Constants.DRUID_DATA_SOURCE);
    if (dataSource == null) {
        throw new SerDeException("Druid data source not specified; use " + Constants.DRUID_DATA_SOURCE + " in table properties");
    }
    SegmentMetadataQueryBuilder builder = new Druids.SegmentMetadataQueryBuilder();
    builder.dataSource(dataSource);
    builder.merge(true);
    builder.analysisTypes();
    SegmentMetadataQuery query = builder.build();
    // Execute query in Druid
    String address = HiveConf.getVar(configuration, HiveConf.ConfVars.HIVE_DRUID_BROKER_DEFAULT_ADDRESS);
    if (org.apache.commons.lang3.StringUtils.isEmpty(address)) {
        throw new SerDeException("Druid broker address not specified in configuration");
    }
    // Infer schema
    SegmentAnalysis schemaInfo;
    try {
        schemaInfo = submitMetadataRequest(address, query);
    } catch (IOException e) {
        throw new SerDeException(e);
    }
    for (Entry<String, ColumnAnalysis> columnInfo : schemaInfo.getColumns().entrySet()) {
        if (columnInfo.getKey().equals(DruidConstants.DEFAULT_TIMESTAMP_COLUMN)) {
            // Special handling for timestamp column
            // field name
            columnNames.add(columnInfo.getKey());
            // field type
            PrimitiveTypeInfo type = tsTZTypeInfo;
            columnTypes.add(type);
            inspectors.add(PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(type));
            continue;
        }
        // field name
        columnNames.add(columnInfo.getKey());
        // field type
        PrimitiveTypeInfo type = DruidSerDeUtils.convertDruidToHiveType(columnInfo.getValue().getType());
        columnTypes.add(type instanceof TimestampLocalTZTypeInfo ? tsTZTypeInfo : type);
        inspectors.add(PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(type));
    }
    columns = columnNames.toArray(new String[0]);
    types = columnTypes.toArray(new PrimitiveTypeInfo[0]);
    inspector = ObjectInspectorFactory.getStandardStructObjectInspector(columnNames, inspectors);
}