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#pragma once
#include <Core/NamesAndTypes.h>
#include <Interpreters/DatabaseAndTableWithAlias.h>
#include <Interpreters/InterpreterSelectWithUnionQuery.h>
#include <Interpreters/Context.h>
#include <Interpreters/StorageID.h>
#include <Storages/IStorage_fwd.h>
namespace DB
{
class ASTSelectQuery;
class TableJoin;
struct SelectQueryOptions;
struct StorageInMemoryMetadata;
using StorageMetadataPtr = std::shared_ptr<const StorageInMemoryMetadata>;
/// Joined tables' columns resolver.
/// We want to get each table structure at most once per table occurrence. Or even better once per table.
/// TODO: joins tree with costs to change joins order by CBO.
class JoinedTables
{
public:
JoinedTables(ContextPtr context, const ASTSelectQuery & select_query_, bool include_all_columns_ = false, bool is_create_parameterized_view_ = false);
void reset(const ASTSelectQuery & select_query);
StoragePtr getLeftTableStorage();
bool resolveTables();
/// Make fake tables_with_columns[0] in case we have predefined input in InterpreterSelectQuery
void makeFakeTable(StoragePtr storage, const StorageMetadataPtr & metadata_snapshot, const Block & source_header);
std::shared_ptr<TableJoin> makeTableJoin(const ASTSelectQuery & select_query);
const TablesWithColumns & tablesWithColumns() const { return tables_with_columns; }
bool isLeftTableSubquery() const;
bool isLeftTableFunction() const;
size_t tablesCount() const { return table_expressions.size(); }
void rewriteDistributedInAndJoins(ASTPtr & query);
std::unique_ptr<InterpreterSelectWithUnionQuery> makeLeftTableSubquery(const SelectQueryOptions & select_options);
private:
ContextPtr context;
std::vector<const ASTTableExpression *> table_expressions;
TablesWithColumns tables_with_columns;
const bool include_all_columns;
/// Legacy (duplicated left table values)
ASTPtr left_table_expression;
std::optional<DatabaseAndTableWithAlias> left_db_and_table;
const ASTSelectQuery & select_query;
const bool is_create_parameterized_view;
};
}
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