mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-04 21:42:39 +00:00
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
#pragma once
|
|
|
|
#include <Core/Names.h>
|
|
#include <Parsers/IAST.h>
|
|
#include <Common/SettingsChanges.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
constexpr char QUERY_PARAMETER_NAME_PREFIX[] = "param_";
|
|
|
|
/** SET query
|
|
*/
|
|
class ASTSetQuery : public IAST
|
|
{
|
|
public:
|
|
bool is_standalone = true; /// If false, this AST is a part of another query, such as SELECT.
|
|
|
|
/// To support overriding certain settings in a **subquery**, we add a ASTSetQuery with Settings to all subqueries, containing
|
|
/// the list of all settings that affect them (specifically or globally to the whole query).
|
|
/// We use `print_in_format` to avoid printing these nodes when they were left unchanged from the parent copy
|
|
/// See more: https://github.com/ClickHouse/ClickHouse/issues/38895
|
|
bool print_in_format = true;
|
|
|
|
SettingsChanges changes;
|
|
/// settings that will be reset to default value
|
|
std::vector<String> default_settings;
|
|
NameToNameMap query_parameters;
|
|
|
|
/** Get the text that identifies this element. */
|
|
String getID(char) const override { return "Set"; }
|
|
|
|
ASTPtr clone() const override { return std::make_shared<ASTSetQuery>(*this); }
|
|
|
|
void formatImpl(const FormatSettings & format, FormatState &, FormatStateStacked) const override;
|
|
|
|
void updateTreeHashImpl(SipHash & hash_state) const override;
|
|
|
|
QueryKind getQueryKind() const override { return QueryKind::Set; }
|
|
|
|
void appendColumnName(WriteBuffer & ostr) const override;
|
|
void appendColumnNameWithoutAlias(WriteBuffer & ostr) const override { return appendColumnName(ostr); }
|
|
};
|
|
|
|
}
|