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#pragma once
#include <vector>
#include <base/types.h>
#include <Poco/Util/AbstractConfiguration.h>
#include <Processors/ISimpleTransform.h>
#include <Columns/IColumn.h>
#include <Core/Block.h>
#include <Interpreters/Context_fwd.h>
namespace DB
{
struct DictionaryStructure;
class SettingsChanges;
/// For simple key
Block blockForIds(
const DictionaryStructure & dict_struct,
const std::vector<UInt64> & ids);
/// For composite key
Block blockForKeys(
const DictionaryStructure & dict_struct,
const Columns & key_columns,
const std::vector<size_t> & requested_rows);
/// Used for applying settings to copied context in some register[...]Source functions
SettingsChanges readSettingsFromDictionaryConfig(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix);
ContextMutablePtr copyContextAndApplySettingsFromDictionaryConfig(const ContextPtr & context, const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix);
/** A stream, adds additional columns to each block that it will read from inner stream.
*
* block_to_add rows size must be equal to final sum rows size of all inner stream blocks.
*/
class TransformWithAdditionalColumns final : public ISimpleTransform
{
public:
TransformWithAdditionalColumns(Block block_to_add_, const Block & header);
void transform(Chunk & chunk) override;
String getName() const override;
private:
Block block_to_add;
size_t current_range_index = 0;
};
}
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