Examples with RelModifiedMonotonicity org.apache.flink.table.planner.plan.trait.RelModifiedMonotonicity used on opensource projects

Example 1 with RelModifiedMonotonicity

use of org.apache.flink.table.planner.plan.trait.RelModifiedMonotonicity in project flink by apache.

the class RankProcessStrategy method analyzeRankProcessStrategies.

/**
 * Gets {@link RankProcessStrategy} based on input, partitionKey and orderKey.
 */
static List<RankProcessStrategy> analyzeRankProcessStrategies(StreamPhysicalRel rank, ImmutableBitSet partitionKey, RelCollation orderKey) {
    FlinkRelMetadataQuery mq = (FlinkRelMetadataQuery) rank.getCluster().getMetadataQuery();
    List<RelFieldCollation> fieldCollations = orderKey.getFieldCollations();
    boolean isUpdateStream = !ChangelogPlanUtils.inputInsertOnly(rank);
    RelNode input = rank.getInput(0);
    if (isUpdateStream) {
        Set<ImmutableBitSet> upsertKeys = mq.getUpsertKeysInKeyGroupRange(input, partitionKey.toArray());
        if (upsertKeys == null || upsertKeys.isEmpty() || // upsert key should contains partition key
        upsertKeys.stream().noneMatch(k -> k.contains(partitionKey))) {
            // and we fall back to using retract rank
            return Collections.singletonList(RETRACT_STRATEGY);
        } else {
            FlinkRelMetadataQuery fmq = FlinkRelMetadataQuery.reuseOrCreate(mq);
            RelModifiedMonotonicity monotonicity = fmq.getRelModifiedMonotonicity(input);
            boolean isMonotonic = false;
            if (monotonicity != null && !fieldCollations.isEmpty()) {
                isMonotonic = fieldCollations.stream().allMatch(collation -> {
                    SqlMonotonicity fieldMonotonicity = monotonicity.fieldMonotonicities()[collation.getFieldIndex()];
                    RelFieldCollation.Direction direction = collation.direction;
                    if ((fieldMonotonicity == SqlMonotonicity.DECREASING || fieldMonotonicity == SqlMonotonicity.STRICTLY_DECREASING) && direction == RelFieldCollation.Direction.ASCENDING) {
                        // is decreasing
                        return true;
                    } else if ((fieldMonotonicity == SqlMonotonicity.INCREASING || fieldMonotonicity == SqlMonotonicity.STRICTLY_INCREASING) && direction == RelFieldCollation.Direction.DESCENDING) {
                        // is increasing
                        return true;
                    } else {
                        // it is monotonic
                        return fieldMonotonicity == SqlMonotonicity.CONSTANT;
                    }
                });
            }
            if (isMonotonic) {
                // TODO: choose a set of primary key
                return Arrays.asList(new UpdateFastStrategy(upsertKeys.iterator().next().toArray()), RETRACT_STRATEGY);
            } else {
                return Collections.singletonList(RETRACT_STRATEGY);
            }
        }
    } else {
        return Collections.singletonList(APPEND_FAST_STRATEGY);
    }
}