mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 02:41:59 +00:00
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#include <Storages/IStorage.h>
|
|
#include <Storages/ColumnsDescription.h>
|
|
#include <Storages/StorageValues.h>
|
|
#include <Processors/Sources/SourceFromSingleChunk.h>
|
|
#include <QueryPipeline/Pipe.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
StorageValues::StorageValues(
|
|
const StorageID & table_id_,
|
|
const ColumnsDescription & columns_,
|
|
const Block & res_block_,
|
|
VirtualColumnsDescription virtuals_)
|
|
: IStorage(table_id_), res_block(res_block_)
|
|
{
|
|
StorageInMemoryMetadata storage_metadata;
|
|
storage_metadata.setColumns(columns_);
|
|
setInMemoryMetadata(storage_metadata);
|
|
setVirtuals(std::move(virtuals_));
|
|
}
|
|
|
|
Pipe StorageValues::read(
|
|
const Names & column_names,
|
|
const StorageSnapshotPtr & storage_snapshot,
|
|
SelectQueryInfo & /*query_info*/,
|
|
ContextPtr /*context*/,
|
|
QueryProcessingStage::Enum /*processed_stage*/,
|
|
size_t /*max_block_size*/,
|
|
size_t /*num_streams*/)
|
|
{
|
|
storage_snapshot->check(column_names);
|
|
|
|
/// Get only required columns.
|
|
Block block;
|
|
for (const auto & name : column_names)
|
|
block.insert(res_block.getByName(name));
|
|
|
|
Chunk chunk(block.getColumns(), block.rows());
|
|
return Pipe(std::make_shared<SourceFromSingleChunk>(block.cloneEmpty(), std::move(chunk)));
|
|
}
|
|
|
|
}
|