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

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#pragma once
#include <DB/Core/Field.h>
#include <DB/Parsers/IAST.h>
namespace DB
{
/** SET запрос
*/
class ASTSetQuery : public IAST
{
public:
struct Change
{
String name;
Field value;
};
typedef std::vector<Change> Changes;
Changes changes;
bool global; /// Если запрос SET GLOBAL.
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ASTSetQuery() = default;
ASTSetQuery(const StringRange range_) : IAST(range_) {}
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/** Получить текст, который идентифицирует этот элемент. */
String getID() const override { return "Set"; };
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ASTPtr clone() const override { return new ASTSetQuery(*this); }
protected:
void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override
{
settings.ostr << (settings.hilite ? hilite_keyword : "") << "SET " << (global ? "GLOBAL " : "") << (settings.hilite ? hilite_none : "");
for (ASTSetQuery::Changes::const_iterator it = changes.begin(); it != changes.end(); ++it)
{
if (it != changes.begin())
settings.ostr << ", ";
settings.ostr << it->name << " = " << apply_visitor(FieldVisitorToString(), it->value);
}
}
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};
}