ClickHouse/dbms/src/Interpreters/SubqueryForSet.h

50 lines
1.4 KiB
C++
Raw Normal View History

#pragma once
#include <Parsers/IAST.h>
#include <Interpreters/PreparedSets.h>
#include <Interpreters/ExpressionActions.h>
namespace DB
{
class Join;
using JoinPtr = std::shared_ptr<Join>;
class InterpreterSelectWithUnionQuery;
struct JoinedColumn;
/// Information on what to do when executing a subquery in the [GLOBAL] IN/JOIN section.
struct SubqueryForSet
{
/// The source is obtained using the InterpreterSelectQuery subquery.
BlockInputStreamPtr source;
/// If set, build it from result.
SetPtr set;
JoinPtr join;
/// Apply this actions to joined block.
ExpressionActionsPtr joined_block_actions;
/// If set, put the result into the table.
/// This is a temporary table for transferring to remote servers for distributed query processing.
StoragePtr table;
void makeSource(std::shared_ptr<InterpreterSelectWithUnionQuery> & interpreter,
const std::list<JoinedColumn> & columns_from_joined_table,
const NameSet & required_columns_from_joined_table);
Block renamedSampleBlock() const { return sample_block; }
void renameColumns(Block & block);
private:
NamesWithAliases joined_block_aliases; /// Rename column from joined block from this list.
Block sample_block; /// source->getHeader() + column renames
};
/// ID of subquery -> what to do with it.
using SubqueriesForSets = std::unordered_map<String, SubqueryForSet>;
}