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#pragma once
#include <Poco/Timestamp.h>
#include "IDictionarySource.h"
#include <Core/Block.h>
#include <Interpreters/Context.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
}
/// Allows loading dictionaries from a file with given format, does not support "random access"
class FileDictionarySource final : public IDictionarySource
{
public:
FileDictionarySource(const std::string & filepath_, const std::string & format_,
Block & sample_block_, ContextPtr context_, bool created_from_ddl);
FileDictionarySource(const FileDictionarySource & other);
QueryPipeline loadAll() override;
QueryPipeline loadUpdatedAll() override
{
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method loadUpdatedAll is unsupported for FileDictionarySource");
}
QueryPipeline loadIds(const std::vector<UInt64> & /*ids*/) override
{
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method loadIds is unsupported for FileDictionarySource");
}
QueryPipeline loadKeys(const Columns & /*key_columns*/, const std::vector<size_t> & /*requested_rows*/) override
{
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Method loadKeys is unsupported for FileDictionarySource");
}
bool isModified() const override
{
// We can't count on that the mtime increases or that it has
// a particular relation to system time, so just check for strict
// equality.
return getLastModification() != last_modification;
}
bool supportsSelectiveLoad() const override { return false; }
///Not supported for FileDictionarySource
bool hasUpdateField() const override { return false; }
DictionarySourcePtr clone() const override { return std::make_shared<FileDictionarySource>(*this); }
std::string toString() const override;
private:
Poco::Timestamp getLastModification() const;
const std::string filepath;
const std::string format;
Block sample_block;
ContextPtr context;
Poco::Timestamp last_modification;
};
}
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