Class SelectSymbol

server/src/main/java/io/crate/expression/symbol/SelectSymbol.java:37–129

Symbol representing a sub-query

 * Symbol representing a sub-query
 */
public class SelectSymbol implements Symbol {

    private static final long SHALLOW_SIZE = RamUsageEstimator.shallowSizeOfInstance(SelectSymbol.class);

    private final AnalyzedRelation relation;
    private final ArrayType<?> dataType;
    private final ResultType resultType;
    private final boolean isCorrelated;
    private final boolean parentIsOrderSensitive;

    public enum ResultType {
        SINGLE_COLUMN_SINGLE_VALUE,
        SINGLE_COLUMN_MULTIPLE_VALUES,
        SINGLE_COLUMN_EXISTS
    }

    public SelectSymbol(AnalyzedRelation relation, ArrayType<?> dataType,
                        ResultType resultType,
                        boolean parentIsOrderSensitive) {

        this.relation = relation;
        this.dataType = dataType;
        this.resultType = resultType;
        boolean[] isCorrelatedArr = new boolean[] { false };
        relation.visitSymbols(symbolTree -> {
            if (symbolTree.any(s -> s instanceof OuterColumn)) {
                isCorrelatedArr[0] = true;
            }
        });
        this.isCorrelated = isCorrelatedArr[0];
        this.parentIsOrderSensitive = parentIsOrderSensitive;
    }

    public AnalyzedRelation relation() {
        return relation;
    }

    public boolean isCorrelated() {
        return isCorrelated;
    }

    public boolean parentIsOrderSensitive() {
        return parentIsOrderSensitive;
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        throw new UnsupportedOperationException("Cannot stream SelectSymbol");
    }

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

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