Examples with JaninoRelMetadataProvider org.apache.calcite.rel.metadata.JaninoRelMetadataProvider used on opensource projects

Example 1 with JaninoRelMetadataProvider

use of org.apache.calcite.rel.metadata.JaninoRelMetadataProvider in project drill by apache.

the class DefaultSqlHandler method transform.

/**
   * Transform RelNode to a new RelNode, targeting the provided set of traits. Also will log the outcome if asked.
   *
   * @param plannerType
   *          The type of Planner to use.
   * @param phase
   *          The transformation phase we're running.
   * @param input
   *          The origianl RelNode
   * @param targetTraits
   *          The traits we are targeting for output.
   * @param log
   *          Whether to log the planning phase.
   * @return The transformed relnode.
   */
protected RelNode transform(PlannerType plannerType, PlannerPhase phase, RelNode input, RelTraitSet targetTraits, boolean log) {
    final Stopwatch watch = Stopwatch.createStarted();
    final RuleSet rules = config.getRules(phase);
    final RelTraitSet toTraits = targetTraits.simplify();
    final RelNode output;
    switch(plannerType) {
        case HEP_BOTTOM_UP:
        case HEP:
            {
                final HepProgramBuilder hepPgmBldr = new HepProgramBuilder();
                if (plannerType == PlannerType.HEP_BOTTOM_UP) {
                    hepPgmBldr.addMatchOrder(HepMatchOrder.BOTTOM_UP);
                }
                for (RelOptRule rule : rules) {
                    hepPgmBldr.addRuleInstance(rule);
                }
                final HepPlanner planner = new HepPlanner(hepPgmBldr.build(), context.getPlannerSettings());
                JaninoRelMetadataProvider relMetadataProvider = JaninoRelMetadataProvider.of(DrillDefaultRelMetadataProvider.INSTANCE);
                RelMetadataQuery.THREAD_PROVIDERS.set(relMetadataProvider);
                // Modify RelMetaProvider for every RelNode in the SQL operator Rel tree.
                input.accept(new MetaDataProviderModifier(relMetadataProvider));
                planner.setRoot(input);
                if (!input.getTraitSet().equals(targetTraits)) {
                    planner.changeTraits(input, toTraits);
                }
                output = planner.findBestExp();
                break;
            }
        case VOLCANO:
        default:
            {
                // as weird as it seems, the cluster's only planner is the volcano planner.
                final RelOptPlanner planner = input.getCluster().getPlanner();
                final Program program = Programs.of(rules);
                Preconditions.checkArgument(planner instanceof VolcanoPlanner, "Cluster is expected to be constructed using VolcanoPlanner. Was actually of type %s.", planner.getClass().getName());
                output = program.run(planner, input, toTraits);
                break;
            }
    }
    if (log) {
        log(plannerType, phase, output, logger, watch);
    }
    return output;
}