Examples with SINGLE_DISTRIBUTION com.facebook.presto.sql.planner.SystemPartitioningHandle.SINGLE_DISTRIBUTION used on opensource projects

Example 1 with SINGLE_DISTRIBUTION

use of com.facebook.presto.sql.planner.SystemPartitioningHandle.SINGLE_DISTRIBUTION in project presto by prestodb.

the class LocalExecutionPlanner method createOutputPartitioning.

private Optional<OutputPartitioning> createOutputPartitioning(TaskContext taskContext, PartitioningScheme partitioningScheme) {
    if (partitioningScheme.getPartitioning().getHandle().equals(FIXED_BROADCAST_DISTRIBUTION) || partitioningScheme.getPartitioning().getHandle().equals(FIXED_ARBITRARY_DISTRIBUTION) || partitioningScheme.getPartitioning().getHandle().equals(SCALED_WRITER_DISTRIBUTION) || partitioningScheme.getPartitioning().getHandle().equals(SINGLE_DISTRIBUTION) || partitioningScheme.getPartitioning().getHandle().equals(COORDINATOR_DISTRIBUTION)) {
        return Optional.empty();
    }
    List<VariableReferenceExpression> outputLayout = partitioningScheme.getOutputLayout();
    // We can convert the variables directly into channels, because the root must be a sink and therefore the layout is fixed
    List<Integer> partitionChannels;
    List<Optional<ConstantExpression>> partitionConstants;
    List<Type> partitionChannelTypes;
    if (partitioningScheme.getHashColumn().isPresent()) {
        partitionChannels = ImmutableList.of(outputLayout.indexOf(partitioningScheme.getHashColumn().get()));
        partitionConstants = ImmutableList.of(Optional.empty());
        partitionChannelTypes = ImmutableList.of(BIGINT);
    } else {
        checkArgument(partitioningScheme.getPartitioning().getArguments().stream().allMatch(argument -> argument instanceof ConstantExpression || argument instanceof VariableReferenceExpression), format("Expect all partitioning arguments to be either ConstantExpression or VariableReferenceExpression, but get %s", partitioningScheme.getPartitioning().getArguments()));
        partitionChannels = partitioningScheme.getPartitioning().getArguments().stream().map(argument -> {
            if (argument instanceof ConstantExpression) {
                return -1;
            }
            return outputLayout.indexOf(argument);
        }).collect(toImmutableList());
        partitionConstants = partitioningScheme.getPartitioning().getArguments().stream().map(argument -> {
            if (argument instanceof ConstantExpression) {
                return Optional.of((ConstantExpression) argument);
            }
            return Optional.<ConstantExpression>empty();
        }).collect(toImmutableList());
        partitionChannelTypes = partitioningScheme.getPartitioning().getArguments().stream().map(RowExpression::getType).collect(toImmutableList());
    }
    PartitionFunction partitionFunction = nodePartitioningManager.getPartitionFunction(taskContext.getSession(), partitioningScheme, partitionChannelTypes);
    OptionalInt nullChannel = OptionalInt.empty();
    Set<VariableReferenceExpression> partitioningColumns = partitioningScheme.getPartitioning().getVariableReferences();
    // partitioningColumns expected to have one column in the normal case, and zero columns when partitioning on a constant
    checkArgument(!partitioningScheme.isReplicateNullsAndAny() || partitioningColumns.size() <= 1);
    if (partitioningScheme.isReplicateNullsAndAny() && partitioningColumns.size() == 1) {
        nullChannel = OptionalInt.of(outputLayout.indexOf(getOnlyElement(partitioningColumns)));
    }
    return Optional.of(new OutputPartitioning(partitionFunction, partitionChannels, partitionConstants, partitioningScheme.isReplicateNullsAndAny(), nullChannel));
}