ClickHouse/dbms/include/DB/DataStreams/PushingToViewsBlockOutputStream.h

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#pragma once
#include <DB/DataStreams/copyData.h>
#include <DB/DataStreams/IBlockOutputStream.h>
#include <DB/DataStreams/OneBlockInputStream.h>
#include <DB/DataStreams/MaterializingBlockInputStream.h>
#include <DB/Interpreters/InterpreterSelectQuery.h>
#include <DB/Storages/StorageView.h>
namespace DB
{
/** Записывает данные в указанную таблицу, при этом рекурсивно вызываясь от всех зависимых вьюшек.
* Если вьюшка не материализованная, то в нее данные не записываются, лишь перенаправляются дальше.
*/
class PushingToViewsBlockOutputStream : public IBlockOutputStream
{
public:
PushingToViewsBlockOutputStream(String database_, String table_, const Context &context_, ASTPtr query_ptr_)
:database(database_), table(table_), context(context_), query_ptr(query_ptr_)
{
if (database.empty())
database = context.getCurrentDatabase();
storage = context.getTable(database, table);
Dependencies dependencies = context.getDependencies(DatabaseAndTableName(database, table));
for (size_t i = 0; i < dependencies.size(); ++i)
{
children.push_back(new PushingToViewsBlockOutputStream(dependencies[i].first, dependencies[i].second, context, ASTPtr()));
queries.push_back(dynamic_cast<StorageView &>(*context.getTable(dependencies[i].first, dependencies[i].second)).getInnerQuery());
}
}
String getName() const { return "PushingToViewsBlockOutputStream"; }
void write(const Block & block)
{
for (size_t i = 0; i < children.size(); ++i)
{
BlockInputStreamPtr from = new OneBlockInputStream(block);
InterpreterSelectQuery select(queries[i], context, QueryProcessingStage::Complete, 0, from);
BlockInputStreamPtr data = new MaterializingBlockInputStream(select.execute());
copyData(*data, *children[i]);
}
Block buf(block);
if (storage->getName() != "View")
storage->write(query_ptr)->write(buf);
}
private:
StoragePtr storage;
String database;
String table;
Context context;
ASTPtr query_ptr;
std::vector<BlockOutputStreamPtr> children;
std::vector<ASTPtr> queries;
};
}