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