Examples with RecordQueryUnionPlanBase com.apple.foundationdb.record.query.plan.plans.RecordQueryUnionPlanBase used on opensource projects

Example 1 with RecordQueryUnionPlanBase

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

the class UnionVisitor method postVisit.

@Nonnull
@Override
public RecordQueryPlan postVisit(@Nonnull final RecordQueryPlan recordQueryPlan) {
    if (recordQueryPlan instanceof RecordQueryUnionPlanBase) {
        RecordQueryUnionPlanBase unionPlan = (RecordQueryUnionPlanBase) recordQueryPlan;
        final Set<KeyExpression> requiredFields = unionPlan.getRequiredFields();
        boolean shouldPullOutFilter = false;
        QueryComponent filter = null;
        if (unionPlan.getChildren().stream().allMatch(child -> child instanceof RecordQueryFilterPlan)) {
            filter = ((RecordQueryFilterPlan) unionPlan.getChildren().get(0)).getConjunctedFilter();
            // needed for lambda expression
            final QueryComponent finalFilter = filter;
            shouldPullOutFilter = unionPlan.getChildren().stream().allMatch(plan -> ((RecordQueryFilterPlan) plan).getConjunctedFilter().equals(finalFilter));
        }
        List<ExpressionRef<RecordQueryPlan>> newChildren = new ArrayList<>(unionPlan.getChildren().size());
        for (RecordQueryPlan plan : unionPlan.getChildren()) {
            if (shouldPullOutFilter) {
                // Check if the plan under the filter can have its index fetch removed.
                if (!(plan instanceof RecordQueryFilterPlan)) {
                    throw new RecordCoreException("serious logic error: thought this was a filter plan but it wasn't");
                }
                plan = ((RecordQueryFilterPlan) plan).getChild();
            }
            @Nullable RecordQueryPlan newPlan = removeIndexFetch(plan, requiredFields);
            if (newPlan == null) {
                // can't remove index fetch, so give up
                return recordQueryPlan;
            }
            newChildren.add(GroupExpressionRef.of(newPlan));
        }
        RecordQueryPlan newUnionPlan = new RecordQueryFetchFromPartialRecordPlan(unionPlan.withChildrenReferences(newChildren), TranslateValueFunction.unableToTranslate());
        if (shouldPullOutFilter) {
            return new RecordQueryFilterPlan(newUnionPlan, filter);
        } else {
            return newUnionPlan;
        }
    }
    return recordQueryPlan;
}