Examples with PartialMatch com.apple.foundationdb.record.query.plan.temp.PartialMatch used on opensource projects

Example 11 with PartialMatch

use of com.apple.foundationdb.record.query.plan.temp.PartialMatch in project fdb-record-layer by FoundationDB.

the class MatchableSortExpression method forPartialMatch.

/**
 * This synthesizes a list of {@link BoundKeyPart}s from the current partial match and the ordering information
 * contained in this expression. Using the list of parameter ids, each {@link BoundKeyPart} links together the
 * (1) normalized key expression that originally produced the key (from index, or common primary key)
 * (2) a comparison range for this parameter which is contained in the already existent partial match
 * (3) the predicate on the query part that participated and bound this parameter (and implicitly was used to
 *     synthesize the comparison range in (2)
 * (4) the candidate predicate on the candidate side that is the {@link Placeholder} for the parameter
 * @param partialMatch the pre-existing partial match on {@code (expression, this)} that the caller wants to adjust.
 * @return a list of bound key parts that express the order of the outgoing data stream and their respective mappings
 *         between query and match candidate
 */
@Nonnull
private List<BoundKeyPart> forPartialMatch(@Nonnull PartialMatch partialMatch) {
    final MatchCandidate matchCandidate = partialMatch.getMatchCandidate();
    final MatchInfo matchInfo = partialMatch.getMatchInfo();
    final Map<CorrelationIdentifier, ComparisonRange> parameterBindingMap = matchInfo.getParameterBindingMap();
    final PredicateMap accumulatedPredicateMap = matchInfo.getAccumulatedPredicateMap();
    final ImmutableMap<CorrelationIdentifier, QueryPredicate> parameterBindingPredicateMap = accumulatedPredicateMap.entries().stream().filter(entry -> {
        final PredicateMapping predicateMapping = entry.getValue();
        return predicateMapping.getParameterAliasOptional().isPresent();
    }).collect(ImmutableMap.toImmutableMap(entry -> {
        final PredicateMapping predicateMapping = entry.getValue();
        return Objects.requireNonNull(predicateMapping.getParameterAliasOptional().orElseThrow(() -> new RecordCoreException("parameter alias should have been set")));
    }, entry -> Objects.requireNonNull(entry.getKey())));
    final List<KeyExpression> normalizedKeys = matchCandidate.getAlternativeKeyExpression().normalizeKeyForPositions();
    final ImmutableList.Builder<BoundKeyPart> builder = ImmutableList.builder();
    final List<CorrelationIdentifier> candidateParameterIds = matchCandidate.getParameters();
    for (final CorrelationIdentifier parameterId : sortParameterIds) {
        final int ordinalInCandidate = candidateParameterIds.indexOf(parameterId);
        Verify.verify(ordinalInCandidate >= 0);
        final KeyExpression normalizedKey = normalizedKeys.get(ordinalInCandidate);
        Objects.requireNonNull(parameterId);
        Objects.requireNonNull(normalizedKey);
        @Nullable final ComparisonRange comparisonRange = parameterBindingMap.get(parameterId);
        @Nullable final QueryPredicate queryPredicate = parameterBindingPredicateMap.get(parameterId);
        Verify.verify(comparisonRange == null || comparisonRange.getRangeType() == ComparisonRange.Type.EMPTY || queryPredicate != null);
        builder.add(BoundKeyPart.of(normalizedKey, comparisonRange == null ? ComparisonRange.Type.EMPTY : comparisonRange.getRangeType(), queryPredicate, isReverse));
    }
    return builder.build();
}