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#pragma once
#include <Core/NamesAndAliases.h>
#include <Core/SettingsEnums.h>
#include <Access/Common/AccessRightsElement.h>
#include <Interpreters/IInterpreter.h>
#include <Storages/ColumnsDescription.h>
#include <Storages/ConstraintsDescription.h>
#include <Storages/IStorage_fwd.h>
#include <Storages/StorageInMemoryMetadata.h>
namespace DB
{
class ASTCreateQuery;
class ASTExpressionList;
class ASTConstraintDeclaration;
class ASTStorage;
class IDatabase;
class DDLGuard;
using DatabasePtr = std::shared_ptr<IDatabase>;
using DDLGuardPtr = std::unique_ptr<DDLGuard>;
/** Allows to create new table or database,
* or create an object for existing table or database.
*/
class InterpreterCreateQuery : public IInterpreter, WithMutableContext
{
public:
InterpreterCreateQuery(const ASTPtr & query_ptr_, ContextMutablePtr context_);
BlockIO execute() override;
/// List of columns and their types in AST.
static ASTPtr formatColumns(const NamesAndTypesList & columns);
static ASTPtr formatColumns(const NamesAndTypesList & columns, const NamesAndAliases & alias_columns);
static ASTPtr formatColumns(const ColumnsDescription & columns);
static ASTPtr formatIndices(const IndicesDescription & indices);
static ASTPtr formatConstraints(const ConstraintsDescription & constraints);
static ASTPtr formatProjections(const ProjectionsDescription & projections);
void setForceRestoreData(bool has_force_restore_data_flag_)
{
has_force_restore_data_flag = has_force_restore_data_flag_;
}
void setInternal(bool internal_)
{
internal = internal_;
}
void setForceAttach(bool force_attach_)
{
force_attach = force_attach_;
}
void setLoadDatabaseWithoutTables(bool load_database_without_tables_)
{
load_database_without_tables = load_database_without_tables_;
}
void setDontNeedDDLGuard()
{
need_ddl_guard = false;
}
/// Obtain information about columns, their types, default values and column comments,
/// for case when columns in CREATE query is specified explicitly.
static ColumnsDescription getColumnsDescription(const ASTExpressionList & columns, ContextPtr context, bool attach);
static ConstraintsDescription getConstraintsDescription(const ASTExpressionList * constraints);
static void prepareOnClusterQuery(ASTCreateQuery & create, ContextPtr context, const String & cluster_name);
void extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr) const override;
private:
struct TableProperties
{
ColumnsDescription columns;
IndicesDescription indices;
ConstraintsDescription constraints;
ProjectionsDescription projections;
};
BlockIO createDatabase(ASTCreateQuery & create);
BlockIO createTable(ASTCreateQuery & create);
/// Calculate list of columns, constraints, indices, etc... of table. Rewrite query in canonical way.
TableProperties getTablePropertiesAndNormalizeCreateQuery(ASTCreateQuery & create) const;
void validateTableStructure(const ASTCreateQuery & create, const TableProperties & properties) const;
void setEngine(ASTCreateQuery & create) const;
AccessRightsElements getRequiredAccess() const;
/// Create IStorage and add it to database. If table already exists and IF NOT EXISTS specified, do nothing and return false.
bool doCreateTable(ASTCreateQuery & create, const TableProperties & properties, DDLGuardPtr & ddl_guard);
BlockIO doCreateOrReplaceTable(ASTCreateQuery & create, const InterpreterCreateQuery::TableProperties & properties);
/// Inserts data in created table if it's CREATE ... SELECT
BlockIO fillTableIfNeeded(const ASTCreateQuery & create);
void assertOrSetUUID(ASTCreateQuery & create, const DatabasePtr & database) const;
/// Update create query with columns description from storage if query doesn't have it.
/// It's used to prevent automatic schema inference while table creation on each server startup.
void addColumnsDescriptionToCreateQueryIfNecessary(ASTCreateQuery & create, const StoragePtr & storage);
BlockIO executeQueryOnCluster(ASTCreateQuery & create);
ASTPtr query_ptr;
/// Skip safety threshold when loading tables.
bool has_force_restore_data_flag = false;
/// Is this an internal query - not from the user.
bool internal = false;
bool force_attach = false;
bool load_database_without_tables = false;
bool need_ddl_guard = true;
mutable String as_database_saved;
mutable String as_table_saved;
};
}
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