Examples with JoinOperatorFactory com.facebook.presto.operator.JoinOperatorFactory used on opensource projects

Example 1 with JoinOperatorFactory

use of com.facebook.presto.operator.JoinOperatorFactory in project presto by prestodb.

the class LocalExecutionPlanner method addLookupOuterDrivers.

private static void addLookupOuterDrivers(LocalExecutionPlanContext context) {
    // driver to output the unused rows in the lookup source
    for (DriverFactory factory : context.getDriverFactories()) {
        List<OperatorFactory> operatorFactories = factory.getOperatorFactories();
        for (int i = 0; i < operatorFactories.size(); i++) {
            OperatorFactory operatorFactory = operatorFactories.get(i);
            if (!(operatorFactory instanceof JoinOperatorFactory)) {
                continue;
            }
            JoinOperatorFactory lookupJoin = (JoinOperatorFactory) operatorFactory;
            Optional<OuterOperatorFactoryResult> outerOperatorFactoryResult = lookupJoin.createOuterOperatorFactory();
            if (outerOperatorFactoryResult.isPresent()) {
                // Add a new driver to output the unmatched rows in an outer join.
                // We duplicate all of the factories above the JoinOperator (the ones reading from the joins),
                // and replace the JoinOperator with the OuterOperator (the one that produces unmatched rows).
                ImmutableList.Builder<OperatorFactory> newOperators = ImmutableList.builder();
                newOperators.add(outerOperatorFactoryResult.get().getOuterOperatorFactory());
                operatorFactories.subList(i + 1, operatorFactories.size()).stream().map(OperatorFactory::duplicate).forEach(newOperators::add);
                context.addDriverFactory(false, factory.isOutputDriver(), newOperators.build(), OptionalInt.of(1), outerOperatorFactoryResult.get().getBuildExecutionStrategy(), Optional.empty());
            }
        }
    }
}