mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-05 15:21:43 +00:00
54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
#pragma once
|
|
|
|
#include <DB/Parsers/IAST.h>
|
|
#include <DB/Storages/IStorage.h>
|
|
#include <vector>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class Context;
|
|
struct CollectAliases;
|
|
class WriteBuffer;
|
|
|
|
|
|
/** Collect and analyze table-like expressions in section FROM in a query.
|
|
* For every expression, keep its alias.
|
|
*
|
|
* For ordinary tables, determine database and table name, obtain and keep StoragePtr.
|
|
* For subqueries, determine result structure. This requires analysis of subquery, such as type inference.
|
|
* For table functions, execute them to obtain resulting StoragePtr.
|
|
*
|
|
* NOTE: We assume, that execution of table functions is cheap, as we do it during analysis.
|
|
*/
|
|
struct CollectTables
|
|
{
|
|
void process(ASTPtr & ast, Context & context, const CollectAliases & aliases);
|
|
|
|
enum class Kind
|
|
{
|
|
OrdinaryTable,
|
|
TableFunction,
|
|
Subquery
|
|
};
|
|
|
|
struct TableInfo
|
|
{
|
|
ASTPtr node;
|
|
String database_name;
|
|
String table_name;
|
|
String alias;
|
|
StoragePtr storage;
|
|
Block structure_of_subquery;
|
|
};
|
|
|
|
using Tables = std::vector<TableInfo>;
|
|
Tables tables;
|
|
|
|
/// Debug output
|
|
void dump(WriteBuffer & out) const;
|
|
};
|
|
|
|
}
|