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$ clickhouse-benchmark -i 10000 -d 0 --parallelize_output_from_storages=0 -q "select * from values('foo')"
Loaded 1 queries.
Queries executed: 10000.
localhost:9000, queries 10000, QPS: 2800.490, RPS: 2800.490, MiB/s: 0.032, result RPS: 2800.490, result MiB/s: 0.032.
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99.990% 0.001 sec.
$ clickhouse-benchmark -i 10000 -d 0 --parallelize_output_from_storages=1 -q "select * from values('foo')"
Loaded 1 queries.
Queries executed: 10000.
localhost:9000, queries 10000, QPS: 1259.805, RPS: 1259.805, MiB/s: 0.014, result RPS: 1259.805, result MiB/s: 0.014.
0.000% 0.001 sec.
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95.000% 0.001 sec.
99.000% 0.001 sec.
99.900% 0.001 sec.
99.990% 0.003 sec.
Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
#pragma once
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#include <Storages/IStorage.h>
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namespace DB
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{
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/* One block storage used for values table function
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* It's structure is similar to IStorageSystemOneBlock
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*/
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class StorageValues final : public IStorage
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{
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public:
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StorageValues(
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const StorageID & table_id_, const ColumnsDescription & columns_, const Block & res_block_, const NamesAndTypesList & virtuals_ = {});
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std::string getName() const override { return "Values"; }
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Pipe read(
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const Names & column_names,
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const StorageSnapshotPtr & storage_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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size_t num_streams) override;
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/// Why we may have virtual columns in the storage from a single block?
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/// Because it used as tmp storage for pushing blocks into views, and some
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/// views may contain virtual columns from original storage.
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NamesAndTypesList getVirtuals() const override
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{
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return virtuals;
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}
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/// FIXME probably it should return false, but StorageValues is used in ExecutingInnerQueryFromViewTransform (whatever it is)
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bool supportsTransactions() const override { return true; }
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bool parallelizeOutputAfterReading(ContextPtr) const override { return false; }
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private:
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Block res_block;
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NamesAndTypesList virtuals;
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};
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}
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