ClickHouse/dbms/include/DB/Parsers/ASTSubquery.h

54 lines
1.3 KiB
C++

#pragma once
#include <DB/DataTypes/IDataType.h>
#include <DB/Parsers/ASTWithAlias.h>
namespace DB
{
/** Подзарос SELECT
*/
class ASTSubquery : public ASTWithAlias
{
public:
ASTSubquery() = default;
ASTSubquery(const StringRange range_) : ASTWithAlias(range_) {}
/** Получить текст, который идентифицирует этот элемент. */
String getID() const override { return "Subquery"; }
ASTPtr clone() const override
{
const auto res = std::make_shared<ASTSubquery>(*this);
ASTPtr ptr{res};
res->children.clear();
for (const auto & child : children)
res->children.emplace_back(child->clone());
return ptr;
}
String getColumnName() const override { return getTreeID(); }
protected:
void formatImplWithoutAlias(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
{
std::string indent_str = settings.one_line ? "" : std::string(4 * frame.indent, ' ');
std::string nl_or_nothing = settings.one_line ? "" : "\n";
settings.ostr << nl_or_nothing << indent_str << "(" << nl_or_nothing;
FormatStateStacked frame_nested = frame;
frame_nested.need_parens = false;
++frame_nested.indent;
children[0]->formatImpl(settings, state, frame_nested);
settings.ostr << nl_or_nothing << indent_str << ")";
}
};
}