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43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
#pragma once
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#include <optional>
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#include <ext/shared_ptr_helper.h>
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#include <Storages/IStorage.h>
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namespace DB
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{
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/* Generates random data for given schema.
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*/
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class StorageGenerateRandom final : public ext::shared_ptr_helper<StorageGenerateRandom>, public IStorage
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{
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friend struct ext::shared_ptr_helper<StorageGenerateRandom>;
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public:
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std::string getName() const override { return "GenerateRandom"; }
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Pipe read(
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const Names & column_names,
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const StorageMetadataPtr & /*metadata_snapshot*/,
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SelectQueryInfo & query_info,
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ContextPtr 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) override;
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private:
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UInt64 max_array_length = 10;
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UInt64 max_string_length = 10;
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UInt64 random_seed = 0;
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protected:
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StorageGenerateRandom(
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const StorageID & table_id_,
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const ColumnsDescription & columns_,
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const String & comment,
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UInt64 max_array_length,
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UInt64 max_string_length,
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std::optional<UInt64> random_seed);
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};
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}
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