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89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
#include <Storages/StorageInput.h>
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#include <Storages/IStorage.h>
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#include <Interpreters/Context.h>
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#include <DataStreams/IBlockInputStream.h>
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#include <memory>
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#include <Processors/Sources/SourceWithProgress.h>
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#include <Processors/Pipe.h>
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#include <Processors/Sources/SourceFromInputStream.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int INVALID_USAGE_OF_INPUT;
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}
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StorageInput::StorageInput(const StorageID & table_id, const ColumnsDescription & columns_)
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: IStorage(table_id)
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{
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StorageInMemoryMetadata storage_metadata;
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storage_metadata.setColumns(columns_);
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setInMemoryMetadata(storage_metadata);
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}
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class StorageInputSource : public SourceWithProgress
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{
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public:
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StorageInputSource(Context & context_, Block sample_block)
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: SourceWithProgress(std::move(sample_block)), context(context_)
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{
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}
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Chunk generate() override
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{
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auto block = context.getInputBlocksReaderCallback()(context);
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if (!block)
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return {};
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UInt64 num_rows = block.rows();
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return Chunk(block.getColumns(), num_rows);
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}
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String getName() const override { return "Input"; }
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private:
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Context & context;
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};
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void StorageInput::setInputStream(BlockInputStreamPtr input_stream_)
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{
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input_stream = input_stream_;
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}
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Pipes StorageInput::read(
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const Names & /*column_names*/,
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const StorageMetadataPtr & metadata_snapshot,
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const SelectQueryInfo & /*query_info*/,
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const Context & context,
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QueryProcessingStage::Enum /*processed_stage*/,
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size_t /*max_block_size*/,
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unsigned /*num_streams*/)
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{
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Pipes pipes;
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Context & query_context = const_cast<Context &>(context).getQueryContext();
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/// It is TCP request if we have callbacks for input().
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if (query_context.getInputBlocksReaderCallback())
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{
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/// Send structure to the client.
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query_context.initializeInput(shared_from_this());
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pipes.emplace_back(std::make_shared<StorageInputSource>(query_context, metadata_snapshot->getSampleBlock()));
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return pipes;
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}
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if (!input_stream)
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throw Exception("Input stream is not initialized, input() must be used only in INSERT SELECT query", ErrorCodes::INVALID_USAGE_OF_INPUT);
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pipes.emplace_back(std::make_shared<SourceFromInputStream>(input_stream));
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return pipes;
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}
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}
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