Java 类com.facebook.presto.sql.tree.Except 实例源码

@Override
public Node visitSetOperation(SqlBaseParser.SetOperationContext context)
{
    QueryBody left = (QueryBody) visit(context.left);
    QueryBody right = (QueryBody) visit(context.right);

    boolean distinct = context.setQuantifier() == null || context.setQuantifier().DISTINCT() != null;

    switch (context.operator.getType()) {
        case SqlBaseLexer.UNION:
            return new Union(getLocation(context.UNION()), ImmutableList.of(left, right), distinct);
        case SqlBaseLexer.INTERSECT:
            return new Intersect(getLocation(context.INTERSECT()), ImmutableList.of(left, right), distinct);
        case SqlBaseLexer.EXCEPT:
            return new Except(getLocation(context.EXCEPT()), left, right, distinct);
    }

    throw new IllegalArgumentException("Unsupported set operation: " + context.operator.getText());
}

@Override
protected Void visitExcept(Except node, Integer indent)
{
    processRelation(node.getLeft(), indent);

    builder.append("EXCEPT ");
    if (!node.isDistinct()) {
        builder.append("ALL ");
    }

    processRelation(node.getRight(), indent);

    return null;
}

@Override
protected Void visitExcept(Except node, Integer indent)
{
    processRelation(node.getLeft(), indent);

    builder.append("EXCEPT ");
    if (!node.isDistinct()) {
        builder.append("ALL ");
    }

    processRelation(node.getRight(), indent);

    return null;
}

@Override
protected Void visitExcept(Except node, Integer indent)
{
    processRelation(node.getLeft(), indent);

    builder.append("EXCEPT ");
    if (!node.isDistinct()) {
        builder.append("ALL ");
    }

    processRelation(node.getRight(), indent);

    return null;
}

@Override
protected RelationType visitExcept(Except node, AnalysisContext context)
{
    throw new SemanticException(NOT_SUPPORTED, node, "EXCEPT not yet implemented");
}