Class FetchMarker

server/src/main/java/io/crate/expression/symbol/FetchMarker.java:41–113

A FetchMarker wraps a `_fetchid` and behaves mostly transparent (as if it were the _fetchId), but it carries all the `fetchRefs` that can and will be fetched via the _fetchId.

 * but it carries all the `fetchRefs` that can and will be fetched via the _fetchId.
 */
public final class FetchMarker implements Symbol {

    private final RelationName relationName;
    private final List<Reference> fetchRefs;
    private final Reference fetchId;

    public FetchMarker(RelationName relationName, List<Reference> fetchRefs) {
        this(relationName, fetchRefs, SysColumns.forTable(relationName, SysColumns.FETCHID));
    }

    public FetchMarker(RelationName relationName, List<Reference> fetchRefs, Reference fetchId) {
        this.relationName = relationName;
        this.fetchRefs = fetchRefs;
        this.fetchId = fetchId;
    }

    public List<Reference> fetchRefs() {
        return fetchRefs;
    }

    public RelationName relationName() {
        return relationName;
    }

    public Reference fetchId() {
        return fetchId;
    }

    @Override
    public boolean any(Predicate<? super Symbol> predicate) {
        return predicate.test(this) || fetchId.any(predicate);
    }

    @Override
    public SymbolType symbolType() {
        return SymbolType.REFERENCE;
    }

    @Override
    public <C, R> R accept(SymbolVisitor<C, R> visitor, C context) {
        return visitor.visitFetchMarker(this, context);
    }

    @Override
    public DataType<?> valueType() {
        return fetchId.valueType();
    }

    @Override
    public String toString() {
        return toString(Style.UNQUALIFIED);
    }

    @Override
    public String toString(Style style) {
        if (relationName.schema() == null) {
            return relationName.sqlFqn() + "." + fetchId.toString(style);
        }