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#pragma once
#include <Interpreters/IInterpreter.h>
#include <Parsers/IAST_fwd.h>
namespace DB
{
class AccessRightsElements;
class ASTAlterCommand;
class ASTAlterQuery;
/** Allows you add or remove a column in the table.
* It also allows you to manipulate the partitions of the MergeTree family tables.
*/
class InterpreterAlterQuery : public IInterpreter, WithContext
{
public:
InterpreterAlterQuery(const ASTPtr & query_ptr_, ContextPtr context_);
BlockIO execute() override;
static AccessRightsElements getRequiredAccessForCommand(const ASTAlterCommand & command, const String & database, const String & table);
void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr context) const override;
bool supportsTransactions() const override { return true; }
private:
AccessRightsElements getRequiredAccess() const;
BlockIO executeToTable(const ASTAlterQuery & alter);
BlockIO executeToDatabase(const ASTAlterQuery & alter);
ASTPtr query_ptr;
};
}
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