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#pragma once
#include <Core/Block.h>
#include <Interpreters/Context.h>
#include <Dictionaries/IDictionarySource.h>
#include <Dictionaries/DictionaryStructure.h>
#include <Processors/Sources/ShellCommandSource.h>
namespace DB
{
/// Allows loading dictionaries from executable
class ExecutableDictionarySource final : public IDictionarySource
{
public:
struct Configuration
{
std::string command;
std::vector<std::string> command_arguments;
std::string update_field;
UInt64 update_lag;
/// Implicit key means that the source script will return only values,
/// and the correspondence to the requested keys is determined implicitly - by the order of rows in the result.
bool implicit_key;
};
ExecutableDictionarySource(
const DictionaryStructure & dict_struct_,
const Configuration & configuration_,
Block & sample_block_,
std::shared_ptr<ShellCommandSourceCoordinator> coordinator_,
ContextPtr context_);
ExecutableDictionarySource(const ExecutableDictionarySource & other);
ExecutableDictionarySource & operator=(const ExecutableDictionarySource &) = delete;
QueryPipeline loadAll() override;
/** The logic of this method is flawed, absolutely incorrect and ignorant.
* It may lead to skipping some values due to clock sync or timezone changes.
* The intended usage of "update_field" is totally different.
*/
QueryPipeline loadUpdatedAll() override;
QueryPipeline loadIds(const std::vector<UInt64> & ids) override;
QueryPipeline loadKeys(const Columns & key_columns, const std::vector<size_t> & requested_rows) override;
bool isModified() const override;
bool supportsSelectiveLoad() const override;
bool hasUpdateField() const override;
DictionarySourcePtr clone() const override;
std::string toString() const override;
QueryPipeline getStreamForBlock(const Block & block);
private:
Poco::Logger * log;
time_t update_time = 0;
const DictionaryStructure dict_struct;
const Configuration configuration;
Block sample_block;
std::shared_ptr<ShellCommandSourceCoordinator> coordinator;
ContextPtr context;
};
}
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