mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-21 09:10:48 +00:00
100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
#pragma once
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#include <DB/Core/Block.h>
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#include <DB/Dictionaries/DictionaryStructure.h>
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#include <DB/Dictionaries/FileDictionarySource.h>
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#include <DB/Dictionaries/MySQLDictionarySource.h>
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#include <DB/Dictionaries/ClickHouseDictionarySource.h>
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#include <DB/Dictionaries/MongoDBDictionarySource.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <common/singleton.h>
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#include <memory>
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#include <DB/Core/FieldVisitors.h>
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namespace DB
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{
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namespace
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{
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Block createSampleBlock(const DictionaryStructure & dict_struct)
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{
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Block block{
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ColumnWithTypeAndName{new ColumnUInt64{1}, new DataTypeUInt64, dict_struct.id.name}
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};
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if (dict_struct.range_min)
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for (const auto & attribute : { dict_struct.range_min, dict_struct.range_max })
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block.insert(
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ColumnWithTypeAndName{new ColumnUInt16{1}, new DataTypeDate, attribute->name});
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for (const auto & attribute : dict_struct.attributes)
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{
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auto column = attribute.type->createColumn();
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column->insert(attribute.null_value);
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block.insert(ColumnWithTypeAndName{column, attribute.type, attribute.name});
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}
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return block;
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}
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}
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/// creates IDictionarySource instance from config and DictionaryStructure
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class DictionarySourceFactory : public Singleton<DictionarySourceFactory>
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{
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public:
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DictionarySourcePtr create(
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const std::string & name, Poco::Util::AbstractConfiguration & config, const std::string & config_prefix,
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const DictionaryStructure & dict_struct, Context & context) const
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{
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Poco::Util::AbstractConfiguration::Keys keys;
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config.keys(config_prefix, keys);
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if (keys.size() != 1)
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throw Exception{
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name +": element dictionary.source should have exactly one child element",
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ErrorCodes::EXCESSIVE_ELEMENT_IN_CONFIG
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};
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auto sample_block = createSampleBlock(dict_struct);
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const auto & source_type = keys.front();
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if ("file" == source_type)
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{
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if (dict_struct.has_expressions)
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throw Exception{
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"Dictionary source of type `file` does not support attribute expressions",
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ErrorCodes::LOGICAL_ERROR
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};
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const auto filename = config.getString(config_prefix + ".file.path");
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const auto format = config.getString(config_prefix + ".file.format");
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return std::make_unique<FileDictionarySource>(filename, format, sample_block, context);
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}
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else if ("mysql" == source_type)
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{
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return std::make_unique<MySQLDictionarySource>(dict_struct, config, config_prefix + ".mysql", sample_block);
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}
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else if ("clickhouse" == source_type)
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{
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return std::make_unique<ClickHouseDictionarySource>(dict_struct, config, config_prefix + ".clickhouse",
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sample_block, context);
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}
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else if ("mongodb" == source_type)
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{
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return std::make_unique<MongoDBDictionarySource>(dict_struct, config, config_prefix + ".mongodb",
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sample_block, context);
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}
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throw Exception{
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name + ": unknown dictionary source type: " + source_type,
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ErrorCodes::UNKNOWN_ELEMENT_IN_CONFIG
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};
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}
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};
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}
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