Java 类com.facebook.presto.spi.ConnectorSplitSource 实例源码

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle handle, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    log.info("INFORMATION: AmpoolSplitManager getSplits() called.");

    AmpoolTableLayoutHandle layoutHandle = (AmpoolTableLayoutHandle) layout;
    AmpoolTableHandle tableHandle = layoutHandle.getTable();
    AmpoolTable table = new AmpoolTable(ampoolClient, tableHandle.getTableName());
    // this can happen if table is removed during a query
    checkState(table.getColumnsMetadata() != null, "Table %s.%s no longer exists", tableHandle.getSchemaName(), tableHandle.getTableName());

    List<ConnectorSplit> splits = new ArrayList<>();
    // TODO Pass here bucket id
    splits.add(new AmpoolSplit(connectorId, tableHandle.getSchemaName(), tableHandle.getTableName(),"" ,HostAddress.fromParts("localhost",0)));
    Collections.shuffle(splits);

    return new FixedSplitSource(splits);
}

@Override
    public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorTableLayoutHandle layout)
    {
        KuduTableLayoutHandle layoutHandle = checkType(layout, KuduTableLayoutHandle.class, "layout");
        KuduTableHandle tableHandle = layoutHandle.getTable();
        KuduClient kuduClient = kuduClientManager.getClient();

        List<KuduScanToken> tokens = kuduClientManager.newScanTokenBuilder(kuduClient, tableHandle.getSchemaTableName().getTableName()).build();

        TupleDomain<KuduColumnHandle> effectivePredicate = layoutHandle.getConstraint()
                .transform(handle -> checkType(handle, KuduColumnHandle.class, "columnHandle"));

        ImmutableList.Builder<ConnectorSplit> builder = ImmutableList.builder();

        for (int i = 0; i < tokens.size(); i++) {
//            nodeManager.getWorkerNodes()
            List<HostAddress> hostAddresses = nodeManager.getWorkerNodes().stream()
                    .map(node -> node.getHostAndPort()).collect(Collectors.toList());
            ConnectorSplit split = new KuduSplit(hostAddresses, tableHandle.getSchemaTableName(), i, effectivePredicate);
            builder.add(split);
        }

        kuduClientManager.close(kuduClient);
        return new FixedSplitSource(builder.build());
    }

@Override
public ConnectorSplitSource getSplits(ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    ExampleTableLayoutHandle layoutHandle = checkType(layout, ExampleTableLayoutHandle.class, "layout");
    ExampleTableHandle tableHandle = layoutHandle.getTable();
    ExampleTable table = exampleClient.getTable(tableHandle.getSchemaName(), tableHandle.getTableName());
    // this can happen if table is removed during a query
    checkState(table != null, "Table %s.%s no longer exists", tableHandle.getSchemaName(), tableHandle.getTableName());

    List<ConnectorSplit> splits = new ArrayList<>();
    for (URI uri : table.getSources()) {
        splits.add(new ExampleSplit(connectorId, tableHandle.getSchemaName(), tableHandle.getTableName(), uri));
    }
    Collections.shuffle(splits);

    return new FixedSplitSource(connectorId, splits);
}

@Test
public void testSanity()
        throws InterruptedException
{
    List<ConnectorTableLayoutResult> layouts = metadata.getTableLayouts(SESSION, tableHandle, Constraint.alwaysTrue(), Optional.empty());
    assertEquals(layouts.size(), 1);
    ConnectorTableLayoutResult layout = getOnlyElement(layouts);
    assertInstanceOf(layout.getTableLayout().getHandle(), RaptorTableLayoutHandle.class);

    ConnectorSplitSource splitSource = getSplits(raptorSplitManager, layout);
    int splitCount = 0;
    while (!splitSource.isFinished()) {
        splitCount += getFutureValue(splitSource.getNextBatch(1000)).size();
    }
    assertEquals(splitCount, 4);
}

@Test
public void testAssignRandomNodeWhenBackupAvailable()
        throws InterruptedException, URISyntaxException
{
    InMemoryNodeManager nodeManager = new InMemoryNodeManager();
    RaptorConnectorId connectorId = new RaptorConnectorId("raptor");
    NodeSupplier nodeSupplier = new RaptorNodeSupplier(nodeManager, connectorId);
    PrestoNode node = new PrestoNode(UUID.randomUUID().toString(), new URI("http://127.0.0.1/"), NodeVersion.UNKNOWN);
    nodeManager.addNode(connectorId.toString(), node);
    RaptorSplitManager raptorSplitManagerWithBackup = new RaptorSplitManager(connectorId, nodeSupplier, shardManager, true);

    deleteShardNodes();

    ConnectorTableLayoutResult layout = getOnlyElement(metadata.getTableLayouts(SESSION, tableHandle, Constraint.alwaysTrue(), Optional.empty()));
    ConnectorSplitSource partitionSplit = getSplits(raptorSplitManagerWithBackup, layout);
    List<ConnectorSplit> batch = getFutureValue(partitionSplit.getNextBatch(1), PrestoException.class);
    assertEquals(getOnlyElement(getOnlyElement(batch).getAddresses()), node.getHostAndPort());
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorTableLayoutHandle layoutHandle)
{
    BlackHoleTableLayoutHandle layout = checkType(
            layoutHandle,
            BlackHoleTableLayoutHandle.class,
            "BlackHoleTableLayoutHandle");

    ImmutableList.Builder<BlackHoleSplit> builder = ImmutableList.<BlackHoleSplit>builder();

    for (int i = 0; i < layout.getSplitCount(); i++) {
        builder.add(
                new BlackHoleSplit(
                        layout.getPagesPerSplit(),
                        layout.getRowsPerPage(),
                        layout.getFieldsLength()));
    }
    return new FixedSplitSource("blackhole", builder.build());
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    JmxTableLayoutHandle jmxLayout = checkType(layout, JmxTableLayoutHandle.class, "layout");
    JmxTableHandle tableHandle = jmxLayout.getTable();
    TupleDomain<ColumnHandle> predicate = jmxLayout.getConstraint();

    //TODO is there a better way to get the node column?
    JmxColumnHandle nodeColumnHandle = tableHandle.getColumns().get(0);

    List<ConnectorSplit> splits = nodeManager.getNodes(ACTIVE)
            .stream()
            .filter(node -> {
                NullableValue value = NullableValue.of(VARCHAR, utf8Slice(node.getNodeIdentifier()));
                return predicate.overlaps(fromFixedValues(ImmutableMap.of(nodeColumnHandle, value)));
            })
            .map(node -> new JmxSplit(tableHandle, ImmutableList.of(node.getHostAndPort())))
            .collect(toList());

    return new FixedSplitSource(connectorId, splits);
}

@Test
public void testPredicatePushdown()
        throws Exception
{
    for (Node node : nodes) {
        String nodeIdentifier = node.getNodeIdentifier();
        TupleDomain<ColumnHandle> nodeTupleDomain = TupleDomain.fromFixedValues(ImmutableMap.of(columnHandle, NullableValue.of(VARCHAR, utf8Slice(nodeIdentifier))));
        ConnectorTableLayoutHandle layout = new JmxTableLayoutHandle(tableHandle, nodeTupleDomain);

        ConnectorSplitSource splitSource = splitManager.getSplits(JmxTransactionHandle.INSTANCE, SESSION, layout);
        List<ConnectorSplit> allSplits = getAllSplits(splitSource);

        assertEquals(allSplits.size(), 1);
        assertEquals(allSplits.get(0).getAddresses().size(), 1);
        assertEquals(allSplits.get(0).getAddresses().get(0).getHostText(), nodeIdentifier);
    }
}

@Test
public void testNoPredicate()
        throws Exception
{
    ConnectorTableLayoutHandle layout = new JmxTableLayoutHandle(tableHandle, TupleDomain.all());
    ConnectorSplitSource splitSource = splitManager.getSplits(JmxTransactionHandle.INSTANCE, SESSION, layout);
    List<ConnectorSplit> allSplits = getAllSplits(splitSource);
    assertEquals(allSplits.size(), nodes.size());

    Set<String> actualNodes = nodes.stream().map(Node::getNodeIdentifier).collect(toSet());
    Set<String> expectedNodes = new HashSet<>();
    for (ConnectorSplit split : allSplits) {
        List<HostAddress> addresses = split.getAddresses();
        assertEquals(addresses.size(), 1);
        expectedNodes.add(addresses.get(0).getHostText());
    }
    assertEquals(actualNodes, expectedNodes);
}

@Test
public void testRecordSetProvider()
        throws Exception
{
    for (SchemaTableName schemaTableName : metadata.listTables(SESSION, "jmx")) {
        JmxTableHandle tableHandle = metadata.getTableHandle(SESSION, schemaTableName);
        List<ColumnHandle> columnHandles = ImmutableList.copyOf(metadata.getColumnHandles(SESSION, tableHandle).values());

        ConnectorTableLayoutHandle layout = new JmxTableLayoutHandle(tableHandle, TupleDomain.all());
        ConnectorSplitSource splitSource = splitManager.getSplits(JmxTransactionHandle.INSTANCE, SESSION, layout);
        List<ConnectorSplit> allSplits = getAllSplits(splitSource);
        assertEquals(allSplits.size(), nodes.size());
        ConnectorSplit split = allSplits.get(0);

        RecordSet recordSet = recordSetProvider.getRecordSet(JmxTransactionHandle.INSTANCE, SESSION, split, columnHandles);
        try (RecordCursor cursor = recordSet.cursor()) {
            while (cursor.advanceNextPosition()) {
                for (int i = 0; i < recordSet.getColumnTypes().size(); i++) {
                    cursor.isNull(i);
                }
            }
        }
    }
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    InformationSchemaTableLayoutHandle handle = checkType(layout, InformationSchemaTableLayoutHandle.class, "layout");
    Map<ColumnHandle, NullableValue> bindings = extractFixedValues(handle.getConstraint()).orElse(ImmutableMap.of());

    List<HostAddress> localAddress = ImmutableList.of(nodeManager.getCurrentNode().getHostAndPort());

    Map<String, NullableValue> filters = bindings.entrySet().stream().collect(toMap(
            entry -> checkType(entry.getKey(), InformationSchemaColumnHandle.class, "column").getColumnName(),
            Entry::getValue));

    ConnectorSplit split = new InformationSchemaSplit(handle.getTable(), filters, localAddress);

    return new FixedSplitSource(null, ImmutableList.of(split));
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    TpchTableHandle tableHandle = checkType(layout, TpchTableLayoutHandle.class, "layout").getTable();

    Set<Node> nodes = nodeManager.getActiveDatasourceNodes(connectorId);
    checkState(!nodes.isEmpty(), "No TPCH nodes available");

    int totalParts = nodes.size() * splitsPerNode;
    int partNumber = 0;

    // Split the data using split and skew by the number of nodes available.
    ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();
    for (Node node : nodes) {
        for (int i = 0; i < splitsPerNode; i++) {
            splits.add(new TpchSplit(tableHandle, partNumber, totalParts, ImmutableList.of(node.getHostAndPort())));
            partNumber++;
        }
    }
    return new FixedSplitSource(connectorId, splits.build());
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    CassandraTableLayoutHandle layoutHandle = checkType(layout, CassandraTableLayoutHandle.class, "layout");
    CassandraTableHandle cassandraTableHandle = layoutHandle.getTable();
    List<CassandraPartition> partitions = layoutHandle.getPartitions().get();

    requireNonNull(partitions, "partitions is null");
    if (partitions.isEmpty()) {
        return new FixedSplitSource(connectorId, ImmutableList.<ConnectorSplit>of());
    }

    // if this is an unpartitioned table, split into equal ranges
    if (partitions.size() == 1) {
        CassandraPartition cassandraPartition = partitions.get(0);
        if (cassandraPartition.isUnpartitioned() || cassandraPartition.isIndexedColumnPredicatePushdown()) {
            CassandraTable table = schemaProvider.getTable(cassandraTableHandle);
            List<ConnectorSplit> splits = getSplitsByTokenRange(table, cassandraPartition.getPartitionId());
            return new FixedSplitSource(connectorId, splits);
        }
    }

    return new FixedSplitSource(connectorId, getSplitsForPartitions(cassandraTableHandle, partitions));
}

@Test
public void testGetRecordsS3()
        throws Exception
{
    ConnectorTableHandle table = getTableHandle(tableS3);
    List<ColumnHandle> columnHandles = ImmutableList.copyOf(metadata.getColumnHandles(SESSION, table).values());
    Map<String, Integer> columnIndex = indexColumns(columnHandles);

    List<ConnectorTableLayoutResult> tableLayoutResults = metadata.getTableLayouts(SESSION, table, new Constraint<>(TupleDomain.all(), bindings -> true), Optional.empty());
    HiveTableLayoutHandle layoutHandle = (HiveTableLayoutHandle) getOnlyElement(tableLayoutResults).getTableLayout().getHandle();
    assertEquals(layoutHandle.getPartitions().get().size(), 1);
    ConnectorSplitSource splitSource = splitManager.getSplits(SESSION, layoutHandle);

    long sum = 0;

    for (ConnectorSplit split : getAllSplits(splitSource)) {
        try (ConnectorPageSource pageSource = pageSourceProvider.createPageSource(SESSION, split, columnHandles)) {
            MaterializedResult result = materializeSourceDataStream(SESSION, pageSource, getTypes(columnHandles));

            for (MaterializedRow row : result) {
                sum += (Long) row.getField(columnIndex.get("t_bigint"));
            }
        }
    }
    assertEquals(sum, 78300);
}

@Test
public void testPartitionSchemaNonCanonical()
        throws Exception
{
    ConnectorSession session = newSession();

    ConnectorTableHandle table = getTableHandle(tablePartitionSchemaChangeNonCanonical);
    ColumnHandle column = metadata.getColumnHandles(session, table).get("t_boolean");
    assertNotNull(column);
    List<ConnectorTableLayoutResult> tableLayoutResults = metadata.getTableLayouts(session, table, new Constraint<>(TupleDomain.fromFixedValues(ImmutableMap.of(column, NullableValue.of(BOOLEAN, false))), bindings -> true), Optional.empty());
    ConnectorTableLayoutHandle layoutHandle = getOnlyElement(tableLayoutResults).getTableLayout().getHandle();
    assertEquals(getAllPartitions(layoutHandle).size(), 1);
    assertEquals(getPartitionId(getAllPartitions(layoutHandle).get(0)), "t_boolean=0");

    ConnectorSplitSource splitSource = splitManager.getSplits(session, layoutHandle);
    ConnectorSplit split = getOnlyElement(getAllSplits(splitSource));

    ImmutableList<ColumnHandle> columnHandles = ImmutableList.of(column);
    try (ConnectorPageSource ignored = pageSourceProvider.createPageSource(session, split, columnHandles)) {
        // TODO coercion of non-canonical values should be supported
        fail("expected exception");
    }
    catch (PrestoException e) {
        assertEquals(e.getErrorCode(), HIVE_INVALID_PARTITION_VALUE.toErrorCode());
    }
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    KinesisTableLayoutHandle kinesislayout = handleResolver.convertLayout(layout);
    KinesisTableHandle kinesisTableHandle = kinesislayout.getTable();

    InternalStreamDescription desc = this.getStreamDescription(kinesisTableHandle.getStreamName());

    ImmutableList.Builder<ConnectorSplit> builder = ImmutableList.builder();
    for (Shard shard : desc.getShards()) {
        KinesisSplit split = new KinesisSplit(connectorId,
                kinesisTableHandle.getStreamName(),
                kinesisTableHandle.getMessageDataFormat(),
                shard.getShardId(),
                shard.getSequenceNumberRange().getStartingSequenceNumber(),
                shard.getSequenceNumberRange().getEndingSequenceNumber());
        builder.add(split);
    }

    return new FixedSplitSource(builder.build());
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    RestConnectorTableLayoutHandle layoutHandle = Types.checkType(layout, RestConnectorTableLayoutHandle.class, "layout");

    List<HostAddress> addresses = nodeManager.getRequiredWorkerNodes().stream()
            .map(Node::getHostAndPort)
            .collect(toList());

    return new FixedSplitSource(ImmutableList.of(
            new RestConnectorSplit(layoutHandle.getTableHandle(), addresses)));
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    RaptorTableLayoutHandle handle = checkType(layout, RaptorTableLayoutHandle.class, "layout");
    RaptorTableHandle table = handle.getTable();
    TupleDomain<RaptorColumnHandle> effectivePredicate = toRaptorTupleDomain(handle.getConstraint());
    return new RaptorSplitSource(table.getTableId(), effectivePredicate, table.getTransactionId());
}

@Test(expectedExceptions = PrestoException.class, expectedExceptionsMessageRegExp = "No host for shard .* found: \\[\\]")
public void testNoHostForShard()
        throws InterruptedException
{
    deleteShardNodes();

    ConnectorTableLayoutResult layout = getOnlyElement(metadata.getTableLayouts(SESSION, tableHandle, Constraint.alwaysTrue(), Optional.empty()));
    ConnectorSplitSource splitSource = getSplits(raptorSplitManager, layout);
    getFutureValue(splitSource.getNextBatch(1000));
}

@Test(expectedExceptions = PrestoException.class, expectedExceptionsMessageRegExp = "No nodes available to run query")
public void testNoNodes()
        throws InterruptedException, URISyntaxException
{
    deleteShardNodes();

    RaptorSplitManager raptorSplitManagerWithBackup = new RaptorSplitManager(new RaptorConnectorId("fbraptor"), ImmutableSet::of, shardManager, true);
    ConnectorTableLayoutResult layout = getOnlyElement(metadata.getTableLayouts(SESSION, tableHandle, Constraint.alwaysTrue(), Optional.empty()));
    ConnectorSplitSource splitSource = getSplits(raptorSplitManagerWithBackup, layout);
    getFutureValue(splitSource.getNextBatch(1000), PrestoException.class);
}

private static List<ConnectorSplit> getAllSplits(ConnectorSplitSource splitSource)
        throws InterruptedException, ExecutionException
{
    ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();
    while (!splitSource.isFinished()) {
        List<ConnectorSplit> batch = splitSource.getNextBatch(1000).get();
        splits.addAll(batch);
    }
    return splits.build();
}

@Override
public ConnectorSplitSource getSplits(JdbcTableLayoutHandle layoutHandle)
{
    JdbcTableHandle tableHandle = layoutHandle.getTable();
    JdbcSplit jdbcSplit = new JdbcSplit(
            connectorId,
            tableHandle.getCatalogName(),
            tableHandle.getSchemaName(),
            tableHandle.getTableName(),
            connectionUrl,
            fromProperties(connectionProperties),
            layoutHandle.getTupleDomain());
    return new FixedSplitSource(connectorId, ImmutableList.of(jdbcSplit));
}

public JdbcSplit getSplit(String schemaName, String tableName)
        throws InterruptedException
{
    JdbcTableHandle jdbcTableHandle = jdbcClient.getTableHandle(new SchemaTableName(schemaName, tableName));
    JdbcTableLayoutHandle jdbcLayoutHandle = new JdbcTableLayoutHandle(jdbcTableHandle, TupleDomain.<ColumnHandle>all());
    ConnectorSplitSource splits = jdbcClient.getSplits(jdbcLayoutHandle);
    return (JdbcSplit) getOnlyElement(getFutureValue(splits.getNextBatch(1000)));
}

private RecordCursor getCursor(JdbcTableHandle jdbcTableHandle, List<JdbcColumnHandle> columns, TupleDomain<ColumnHandle> domain)
        throws InterruptedException
{
    JdbcTableLayoutHandle layoutHandle = new JdbcTableLayoutHandle(jdbcTableHandle, domain);
    ConnectorSplitSource splits = jdbcClient.getSplits(layoutHandle);
    JdbcSplit split = (JdbcSplit) getOnlyElement(getFutureValue(splits.getNextBatch(1000)));

    JdbcRecordSetProvider recordSetProvider = new JdbcRecordSetProvider(jdbcClient);
    RecordSet recordSet = recordSetProvider.getRecordSet(SESSION, split, columns);

    return recordSet.cursor();
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    SystemTableLayoutHandle layoutHandle = checkType(layout, SystemTableLayoutHandle.class, "layout");
    SystemTableHandle tableHandle = layoutHandle.getTable();

    TupleDomain<ColumnHandle> constraint = layoutHandle.getConstraint();
    SystemTable systemTable = tables.get(tableHandle.getSchemaTableName());

    Distribution tableDistributionMode = systemTable.getDistribution();
    if (tableDistributionMode == SINGLE_COORDINATOR) {
        HostAddress address = nodeManager.getCurrentNode().getHostAndPort();
        ConnectorSplit split = new SystemSplit(tableHandle.getConnectorId(), tableHandle, address, constraint);
        return new FixedSplitSource(GlobalSystemConnector.NAME, ImmutableList.of(split));
    }

    ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();
    ImmutableSet.Builder<Node> nodes = ImmutableSet.builder();
    if (tableDistributionMode == ALL_COORDINATORS) {
        nodes.addAll(nodeManager.getCoordinators());
    }
    else if (tableDistributionMode == ALL_NODES) {
        nodes.addAll(nodeManager.getNodes(ACTIVE));
    }
    Set<Node> nodeSet = nodes.build();
    for (Node node : nodeSet) {
        splits.add(new SystemSplit(tableHandle.getConnectorId(), tableHandle, node.getHostAndPort(), constraint));
    }
    return new FixedSplitSource(GlobalSystemConnector.NAME, splits.build());
}

public SplitSource getSplits(Session session, TableLayoutHandle layout)
{
    String connectorId = layout.getConnectorId();
    ConnectorSplitManager splitManager = getConnectorSplitManager(connectorId);

    // assumes connectorId and catalog are the same
    ConnectorSession connectorSession = session.toConnectorSession(connectorId);

    ConnectorSplitSource source = splitManager.getSplits(layout.getTransactionHandle(), connectorSession, layout.getConnectorHandle());

    return new ConnectorAwareSplitSource(connectorId, layout.getTransactionHandle(), source);
}

private static StageExecutionPlan createPlan(ConnectorSplitSource splitSource)
{
    Symbol symbol = new Symbol("column");

    // table scan with splitCount splits
    PlanNodeId tableScanNodeId = new PlanNodeId("plan_id");
    PlanFragment testFragment = new PlanFragment(
            new PlanFragmentId("plan_id"),
            new JoinNode(new PlanNodeId("join_id"),
                    INNER,
                    new TableScanNode(
                            tableScanNodeId,
                            new TableHandle(CONNECTOR_ID, new TestingTableHandle()),
                            ImmutableList.of(symbol),
                            ImmutableMap.of(symbol, new TestingColumnHandle("column")),
                            Optional.empty(),
                            TupleDomain.all(),
                            null),
                    new RemoteSourceNode(new PlanNodeId("remote_id"), new PlanFragmentId("plan_fragment_id"), ImmutableList.of()),
                    ImmutableList.of(),
                    Optional.<Symbol>empty(),
                    Optional.<Symbol>empty()),
            ImmutableMap.<Symbol, Type>of(symbol, VARCHAR),
            ImmutableList.of(symbol),
            SOURCE,
            tableScanNodeId,
            Optional.empty());

    return new StageExecutionPlan(testFragment, Optional.of(new ConnectorAwareSplitSource(CONNECTOR_ID, TestingTransactionHandle.create(CONNECTOR_ID), splitSource)), ImmutableList.<StageExecutionPlan>of());
}

private static ConnectorSplitSource createFixedSplitSource(int splitCount, Supplier<ConnectorSplit> splitFactory)
{
    ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();

    for (int i = 0; i < splitCount; i++) {
        splits.add(splitFactory.get());
    }
    return new FixedSplitSource(CONNECTOR_ID, splits.build());
}

@Override
public ConnectorSplitSource getSplits(ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    try (ThreadContextClassLoader ignored = new ThreadContextClassLoader(classLoader)) {
        return delegate.getSplits(session, layout);
    }
}

private static List<ConnectorSplit> getAllSplits(ConnectorSplitSource splitSource)
        throws InterruptedException
{
    ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();
    while (!splitSource.isFinished()) {
        splits.addAll(getFutureValue(splitSource.getNextBatch(1000)));
    }
    return splits.build();
}

private static List<ConnectorSplit> getAllSplits(ConnectorSplitSource source)
        throws InterruptedException
{
    ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();
    while (!source.isFinished()) {
        splits.addAll(getFutureValue(source.getNextBatch(1000)));
    }
    return splits.build();
}

@Test
public void testGetPartitionSplitsBatch()
        throws Exception
{
    ConnectorSession session = newSession();

    ConnectorTableHandle tableHandle = getTableHandle(tablePartitionFormat);
    List<ConnectorTableLayoutResult> tableLayoutResults = metadata.getTableLayouts(session, tableHandle, new Constraint<>(TupleDomain.all(), bindings -> true), Optional.empty());
    ConnectorSplitSource splitSource = splitManager.getSplits(session, getOnlyElement(tableLayoutResults).getTableLayout().getHandle());

    assertEquals(getSplitCount(splitSource), partitionCount);
}

@Test
public void testGetPartitionSplitsBatchUnpartitioned()
        throws Exception
{
    ConnectorSession session = newSession();

    ConnectorTableHandle tableHandle = getTableHandle(tableUnpartitioned);
    List<ConnectorTableLayoutResult> tableLayoutResults = metadata.getTableLayouts(session, tableHandle, new Constraint<>(TupleDomain.all(), bindings -> true), Optional.empty());
    ConnectorSplitSource splitSource = splitManager.getSplits(session, getOnlyElement(tableLayoutResults).getTableLayout().getHandle());

    assertEquals(getSplitCount(splitSource), 1);
}

@Test
public void testGetPartitionSplitsEmpty()
        throws Exception
{
    ConnectorSplitSource splitSource = splitManager.getSplits(newSession(), emptyTableLayoutHandle);
    // fetch full list
    getSplitCount(splitSource);
}

protected static int getSplitCount(ConnectorSplitSource splitSource)
        throws InterruptedException
{
    int splitCount = 0;
    while (!splitSource.isFinished()) {
        List<ConnectorSplit> batch = getFutureValue(splitSource.getNextBatch(1000));
        splitCount += batch.size();
    }
    return splitCount;
}

protected static List<ConnectorSplit> getAllSplits(ConnectorSplitSource splitSource)
        throws InterruptedException
{
    ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();
    while (!splitSource.isFinished()) {
        List<ConnectorSplit> batch = getFutureValue(splitSource.getNextBatch(1000));
        splits.addAll(batch);
    }
    return splits.build();
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle, ConnectorSession session,
    ConnectorTableLayoutHandle layout) {
  SpreadsheetTableLayoutHandle layoutHandle = (SpreadsheetTableLayoutHandle) layout;
  SpreadsheetTableHandle spreadsheetTableHandle = layoutHandle.getTable();
  SpreadsheetSplit spreadsheetSplit = new SpreadsheetSplit(spreadsheetTableHandle);
  return new FixedSplitSource(ImmutableList.of(spreadsheetSplit));
}

@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    KafkaTableHandle kafkaTableHandle = convertLayout(layout).getTable();

    SimpleConsumer simpleConsumer = consumerManager.getConsumer(selectRandom(nodes));

    TopicMetadataRequest topicMetadataRequest = new TopicMetadataRequest(ImmutableList.of(kafkaTableHandle.getTopicName()));
    TopicMetadataResponse topicMetadataResponse = simpleConsumer.send(topicMetadataRequest);

    ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();

    for (TopicMetadata metadata : topicMetadataResponse.topicsMetadata()) {
        for (PartitionMetadata part : metadata.partitionsMetadata()) {
            log.debug("Adding Partition %s/%s", metadata.topic(), part.partitionId());

            Broker leader = part.leader();
            if (leader == null) { // Leader election going on...
                log.warn("No leader for partition %s/%s found!", metadata.topic(), part.partitionId());
                continue;
            }

            HostAddress partitionLeader = HostAddress.fromParts(leader.host(), leader.port());

            SimpleConsumer leaderConsumer = consumerManager.getConsumer(partitionLeader);
            // Kafka contains a reverse list of "end - start" pairs for the splits

            List<HostAddress> partitionNodes = ImmutableList.copyOf(Lists.transform(part.isr(), KafkaSplitManager::brokerToHostAddress));

            long[] offsets = findAllOffsets(leaderConsumer,  metadata.topic(), part.partitionId());

            for (int i = offsets.length - 1; i > 0; i--) {
                KafkaSplit split = new KafkaSplit(
                        connectorId,
                        metadata.topic(),
                        kafkaTableHandle.getKeyDataFormat(),
                        kafkaTableHandle.getMessageDataFormat(),
                        part.partitionId(),
                        offsets[i],
                        offsets[i - 1],
                        partitionNodes);
                splits.add(split);
            }
        }
    }

    return new FixedSplitSource(connectorId, splits.build());
}

private static ConnectorSplitSource getSplits(RaptorSplitManager splitManager, ConnectorTableLayoutResult layout)
{
    ConnectorTransactionHandle transaction = new RaptorTransactionHandle();
    return splitManager.getSplits(transaction, SESSION, layout.getTableLayout().getHandle());
}

@Override
public ConnectorSplitSource getSplits(ConnectorSession session, ConnectorTableLayoutHandle layout)
{
    RedisTableHandle redisTableHandle = convertLayout(layout).getTable();

    List<HostAddress> nodes = new ArrayList<>(redisConnectorConfig.getNodes());
    Collections.shuffle(nodes);

    checkState(!nodes.isEmpty(), "No Redis nodes available");
    ImmutableList.Builder<ConnectorSplit> builder = ImmutableList.builder();

    long numberOfKeys = 1;
    // when Redis keys are provides in a zset, create multiple
    // splits by splitting zset in chunks
    if (redisTableHandle.getKeyDataFormat().equals("zset")) {
        try (Jedis jedis = jedisManager.getJedisPool(nodes.get(0)).getResource()) {
            numberOfKeys = jedis.zcount(redisTableHandle.getKeyName(), "-inf", "+inf");
        }
        catch (Exception e) {
            throw Throwables.propagate(e);
        }
    }

    long stride = REDIS_STRIDE_SPLITS;

    if (numberOfKeys / stride > REDIS_MAX_SPLITS) {
        stride = numberOfKeys / REDIS_MAX_SPLITS;
    }

    for (long startIndex = 0; startIndex < numberOfKeys; startIndex += stride) {
        long endIndex = startIndex + stride - 1;
        if (endIndex >= numberOfKeys) {
            endIndex = -1;
        }

        RedisSplit split = new RedisSplit(connectorId,
                redisTableHandle.getSchemaName(),
                redisTableHandle.getTableName(),
                redisTableHandle.getKeyDataFormat(),
                redisTableHandle.getValueDataFormat(),
                redisTableHandle.getKeyName(),
                startIndex,
                endIndex,
                nodes);

        builder.add(split);
    }
    return new FixedSplitSource(connectorId, builder.build());
}