Examples with QueryComponent com.apple.foundationdb.record.query.expressions.QueryComponent used on opensource projects

Example 96 with QueryComponent

use of com.apple.foundationdb.record.query.expressions.QueryComponent in project fdb-record-layer by FoundationDB.

the class JoinedRecordPlanner method buildQuery.

@Nonnull
private RecordQuery buildQuery(@Nonnull PendingType pendingType) {
    final List<QueryComponent> conditions = new ArrayList<>();
    for (PendingJoin pendingJoin : pendingType.pendingJoins) {
        final boolean bound;
        final KeyExpression expression;
        if (pendingJoin.pendingLeft == pendingType) {
            bound = pendingJoin.rightBound;
            expression = pendingJoin.join.getLeftExpression();
        } else if (pendingJoin.pendingRight == pendingType) {
            bound = pendingJoin.leftBound;
            expression = pendingJoin.join.getRightExpression();
        } else {
            throw notFoundEitherSide();
        }
        if (bound) {
            final Comparisons.Comparison comparison = new Comparisons.ParameterComparison(pendingJoin.singleton ? Comparisons.Type.EQUALS : Comparisons.Type.IN, pendingJoin.bindingName);
            conditions.add(buildCondition(expression, comparison));
            pendingJoins.remove(pendingJoin);
        }
    }
    RecordQuery.Builder builder = RecordQuery.newBuilder();
    builder.setRecordType(pendingType.joinConstituent.getRecordType().getName());
    if (!conditions.isEmpty()) {
        builder.setFilter(conditions.size() > 1 ? Query.and(conditions) : conditions.get(0));
    }
    // An alternative would be to add duplicate elimination on the result of the join before forming the synthetic records.
    // But until the planner is able to push that down / eliminate it when the scan does not produce duplicates, it's better to give it here,
    // since the planner at least understands the simple cases of the elimination.
    builder.setRemoveDuplicates(true);
    return builder.build();
}