Examples with HepPlanner org.apache.calcite.plan.hep.HepPlanner used on opensource projects

Example 6 with HepPlanner

use of org.apache.calcite.plan.hep.HepPlanner in project hive by apache.

the class TestCBORuleFiredOnlyOnce method testRuleFiredOnlyOnce.

@Test
public void testRuleFiredOnlyOnce() {
    HiveConf conf = new HiveConf();
    // Create HepPlanner
    HepProgramBuilder programBuilder = new HepProgramBuilder();
    programBuilder.addMatchOrder(HepMatchOrder.TOP_DOWN);
    programBuilder = programBuilder.addRuleCollection(ImmutableList.<RelOptRule>of(DummyRule.INSTANCE));
    // Create rules registry to not trigger a rule more than once
    HiveRulesRegistry registry = new HiveRulesRegistry();
    HivePlannerContext context = new HivePlannerContext(null, registry, null);
    HepPlanner planner = new HepPlanner(programBuilder.build(), context);
    // Cluster
    RexBuilder rexBuilder = new RexBuilder(new JavaTypeFactoryImpl());
    RelOptCluster cluster = RelOptCluster.create(planner, rexBuilder);
    // Create MD provider
    HiveDefaultRelMetadataProvider mdProvider = new HiveDefaultRelMetadataProvider(conf);
    List<RelMetadataProvider> list = Lists.newArrayList();
    list.add(mdProvider.getMetadataProvider());
    planner.registerMetadataProviders(list);
    RelMetadataProvider chainedProvider = ChainedRelMetadataProvider.of(list);
    final RelNode node = new DummyNode(cluster, cluster.traitSet());
    node.getCluster().setMetadataProvider(new CachingRelMetadataProvider(chainedProvider, planner));
    planner.setRoot(node);
    planner.findBestExp();
    // Matches 3 times: 2 times the original node, 1 time the new node created by the rule
    assertEquals(3, DummyRule.INSTANCE.numberMatches);
    // It is fired only once: on the original node
    assertEquals(1, DummyRule.INSTANCE.numberOnMatch);
}