Examples with FilterCorrelateRule org.apache.calcite.rel.rules.FilterCorrelateRule used on opensource projects

Example 1 with FilterCorrelateRule

use of org.apache.calcite.rel.rules.FilterCorrelateRule in project calcite by apache.

the class RelDecorrelator method decorrelate.

private RelNode decorrelate(RelNode root) {
    // first adjust count() expression if any
    final RelBuilderFactory f = relBuilderFactory();
    HepProgram program = HepProgram.builder().addRuleInstance(new AdjustProjectForCountAggregateRule(false, f)).addRuleInstance(new AdjustProjectForCountAggregateRule(true, f)).addRuleInstance(new FilterJoinRule.FilterIntoJoinRule(true, f, FilterJoinRule.TRUE_PREDICATE)).addRuleInstance(new FilterProjectTransposeRule(Filter.class, Project.class, true, true, f)).addRuleInstance(new FilterCorrelateRule(f)).build();
    HepPlanner planner = createPlanner(program);
    planner.setRoot(root);
    root = planner.findBestExp();
    // Perform decorrelation.
    map.clear();
    final Frame frame = getInvoke(root, null);
    if (frame != null) {
        // has been rewritten; apply rules post-decorrelation
        final HepProgram program2 = HepProgram.builder().addRuleInstance(new FilterJoinRule.FilterIntoJoinRule(true, f, FilterJoinRule.TRUE_PREDICATE)).addRuleInstance(new FilterJoinRule.JoinConditionPushRule(f, FilterJoinRule.TRUE_PREDICATE)).build();
        final HepPlanner planner2 = createPlanner(program2);
        final RelNode newRoot = frame.r;
        planner2.setRoot(newRoot);
        return planner2.findBestExp();
    }
    return root;
}