mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 13:42:02 +00:00
340 lines
9.5 KiB
C++
340 lines
9.5 KiB
C++
#pragma once
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#include <DB/DataTypes/DataTypeFactory.h>
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#include <DB/IO/ReadBufferFromString.h>
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#include <DB/IO/WriteBuffer.h>
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#include <DB/IO/WriteHelpers.h>
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#include <Poco/Util/AbstractConfiguration.h>
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#include <ext/range.hpp>
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#include <numeric>
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#include <vector>
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#include <string>
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#include <map>
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#include <experimental/optional>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int UNKNOWN_TYPE;
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extern const int ARGUMENT_OUT_OF_BOUND;
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extern const int TYPE_MISMATCH;
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}
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enum class AttributeUnderlyingType
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{
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UInt8,
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UInt16,
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UInt32,
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UInt64,
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Int8,
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Int16,
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Int32,
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Int64,
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Float32,
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Float64,
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String
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};
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inline AttributeUnderlyingType getAttributeUnderlyingType(const std::string & type)
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{
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static const std::unordered_map<std::string, AttributeUnderlyingType> dictionary{
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{ "UInt8", AttributeUnderlyingType::UInt8 },
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{ "UInt16", AttributeUnderlyingType::UInt16 },
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{ "UInt32", AttributeUnderlyingType::UInt32 },
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{ "UInt64", AttributeUnderlyingType::UInt64 },
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{ "Int8", AttributeUnderlyingType::Int8 },
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{ "Int16", AttributeUnderlyingType::Int16 },
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{ "Int32", AttributeUnderlyingType::Int32 },
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{ "Int64", AttributeUnderlyingType::Int64 },
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{ "Float32", AttributeUnderlyingType::Float32 },
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{ "Float64", AttributeUnderlyingType::Float64 },
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{ "String", AttributeUnderlyingType::String },
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{ "Date", AttributeUnderlyingType::UInt16 },
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{ "DateTime", AttributeUnderlyingType::UInt32 },
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};
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const auto it = dictionary.find(type);
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if (it != std::end(dictionary))
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return it->second;
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throw Exception{
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"Unknown type " + type,
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ErrorCodes::UNKNOWN_TYPE
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};
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}
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inline std::string toString(const AttributeUnderlyingType type)
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{
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switch (type)
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{
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case AttributeUnderlyingType::UInt8: return "UInt8";
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case AttributeUnderlyingType::UInt16: return "UInt16";
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case AttributeUnderlyingType::UInt32: return "UInt32";
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case AttributeUnderlyingType::UInt64: return "UInt64";
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case AttributeUnderlyingType::Int8: return "Int8";
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case AttributeUnderlyingType::Int16: return "Int16";
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case AttributeUnderlyingType::Int32: return "Int32";
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case AttributeUnderlyingType::Int64: return "Int64";
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case AttributeUnderlyingType::Float32: return "Float32";
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case AttributeUnderlyingType::Float64: return "Float64";
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case AttributeUnderlyingType::String: return "String";
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}
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throw Exception{
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"Unknown attribute_type " + toString(static_cast<int>(type)),
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ErrorCodes::ARGUMENT_OUT_OF_BOUND
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};
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}
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/// Min and max lifetimes for a dictionary or it's entry
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struct DictionaryLifetime final
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{
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std::uint64_t min_sec;
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std::uint64_t max_sec;
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DictionaryLifetime(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix)
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{
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const auto & lifetime_min_key = config_prefix + ".min";
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const auto has_min = config.has(lifetime_min_key);
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this->min_sec = has_min ? config.getInt(lifetime_min_key) : config.getInt(config_prefix);
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this->max_sec = has_min ? config.getInt(config_prefix + ".max") : this->min_sec;
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}
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};
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/** Holds the description of a single dictionary attribute:
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* - name, used for lookup into dictionary and source;
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* - type, used in conjunction with DataTypeFactory and getAttributeUnderlyingTypeByname;
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* - null_value, used as a default value for non-existent entries in the dictionary,
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* decimal representation for numeric attributes;
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* - hierarchical, whether this attribute defines a hierarchy;
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* - injective, whether the mapping to parent is injective (can be used for optimization of GROUP BY?)
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*/
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struct DictionaryAttribute final
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{
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const std::string name;
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const AttributeUnderlyingType underlying_type;
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const DataTypePtr type;
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const std::string expression;
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const Field null_value;
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const bool hierarchical;
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const bool injective;
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};
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struct DictionarySpecialAttribute final
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{
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const std::string name;
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const std::string expression;
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DictionarySpecialAttribute(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix)
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: name{config.getString(config_prefix + ".name", "")},
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expression{config.getString(config_prefix + ".expression", "")}
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{
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if (name.empty() && !expression.empty())
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throw Exception{
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"Element " + config_prefix + ".name is empty",
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ErrorCodes::BAD_ARGUMENTS
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};
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}
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};
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/// Name of identifier plus list of attributes
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struct DictionaryStructure final
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{
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std::experimental::optional<DictionarySpecialAttribute> id;
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std::experimental::optional<std::vector<DictionaryAttribute>> key;
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std::vector<DictionaryAttribute> attributes;
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std::experimental::optional<DictionarySpecialAttribute> range_min;
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std::experimental::optional<DictionarySpecialAttribute> range_max;
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bool has_expressions = false;
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DictionaryStructure(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix)
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{
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const auto has_id = config.has(config_prefix + ".id");
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const auto has_key = config.has(config_prefix + ".key");
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if (has_key && has_id)
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throw Exception{"Only one of 'id' and 'key' should be specified", ErrorCodes::BAD_ARGUMENTS};
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if (has_id)
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id.emplace(config, config_prefix + ".id");
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else if (has_key)
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{
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key.emplace(getAttributes(config, config_prefix + ".key", false, false));
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if (key->empty())
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throw Exception{"Empty 'key' supplied", ErrorCodes::BAD_ARGUMENTS};
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}
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else
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throw Exception{"Dictionary structure should specify either 'id' or 'key'", ErrorCodes::BAD_ARGUMENTS};
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if (id)
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{
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if (id->name.empty())
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throw Exception{"'id' cannot be empty", ErrorCodes::BAD_ARGUMENTS};
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if (config.has(config_prefix + ".range_min"))
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range_min.emplace(config, config_prefix + ".range_min");
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if (config.has(config_prefix + ".range_max"))
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range_max.emplace(config, config_prefix + ".range_max");
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if (!id->expression.empty() ||
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(range_min && !range_min->expression.empty()) ||
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(range_max && !range_max->expression.empty()))
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has_expressions = true;
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}
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attributes = getAttributes(config, config_prefix);
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if (attributes.empty())
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throw Exception{"Dictionary has no attributes defined", ErrorCodes::BAD_ARGUMENTS};
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}
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void validateKeyTypes(const DataTypes & key_types) const
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{
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if (key_types.size() != key.value().size())
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throw Exception{
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"Key structure does not match, expected " + getKeyDescription(),
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ErrorCodes::TYPE_MISMATCH
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};
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for (const auto i : ext::range(0, key_types.size()))
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{
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const auto & expected_type = (*key)[i].type->getName();
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const auto & actual_type = key_types[i]->getName();
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if (expected_type != actual_type)
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throw Exception{
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"Key type at position " + std::to_string(i) + " does not match, expected " + expected_type +
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", found " + actual_type,
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ErrorCodes::TYPE_MISMATCH
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};
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}
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}
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std::string getKeyDescription() const
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{
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if (id)
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return "UInt64";
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std::ostringstream out;
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out << '(';
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auto first = true;
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for (const auto & key_i : *key)
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{
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if (!first)
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out << ", ";
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first = false;
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out << key_i.type->getName();
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}
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out << ')';
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return out.str();
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}
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bool isKeySizeFixed() const
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{
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if (!key)
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return true;
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for (const auto key_i : * key)
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if (key_i.underlying_type == AttributeUnderlyingType::String)
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return false;
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return true;
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}
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std::size_t getKeySize() const
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{
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return std::accumulate(std::begin(*key), std::end(*key), std::size_t{},
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[] (const auto running_size, const auto & key_i) {return running_size + key_i.type->getSizeOfField(); });
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}
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private:
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std::vector<DictionaryAttribute> getAttributes(
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const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix,
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const bool hierarchy_allowed = true, const bool allow_null_values = true)
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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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auto has_hierarchy = false;
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std::vector<DictionaryAttribute> attributes;
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for (const auto & key : keys)
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{
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if (0 != strncmp(key.data(), "attribute", strlen("attribute")))
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continue;
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const auto prefix = config_prefix + '.' + key + '.';
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const auto name = config.getString(prefix + "name");
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const auto type_string = config.getString(prefix + "type");
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const auto type = DataTypeFactory::instance().get(type_string);
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const auto underlying_type = getAttributeUnderlyingType(type_string);
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const auto expression = config.getString(prefix + "expression", "");
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if (!expression.empty())
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has_expressions = true;
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Field null_value;
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if (allow_null_values)
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{
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const auto null_value_string = config.getString(prefix + "null_value");
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try
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{
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ReadBufferFromString null_value_buffer{null_value_string};
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ColumnPtr column_with_null_value = type->createColumn();
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type->deserializeTextEscaped(*column_with_null_value, null_value_buffer);
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null_value = (*column_with_null_value)[0];
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}
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catch (const std::exception & e)
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{
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throw Exception{
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std::string{"Error parsing null_value: "} + e.what(),
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ErrorCodes::BAD_ARGUMENTS
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};
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}
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}
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const auto hierarchical = config.getBool(prefix + "hierarchical", false);
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const auto injective = config.getBool(prefix + "injective", false);
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if (name.empty())
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throw Exception{
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"Properties 'name' and 'type' of an attribute cannot be empty",
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ErrorCodes::BAD_ARGUMENTS
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};
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if (has_hierarchy && !hierarchy_allowed)
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throw Exception{
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"Hierarchy not allowed in '" + prefix,
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ErrorCodes::BAD_ARGUMENTS
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};
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if (has_hierarchy && hierarchical)
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throw Exception{
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"Only one hierarchical attribute supported",
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ErrorCodes::BAD_ARGUMENTS
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};
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has_hierarchy = has_hierarchy || hierarchical;
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attributes.emplace_back(DictionaryAttribute{
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name, underlying_type, type, expression, null_value, hierarchical, injective
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});
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}
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return attributes;
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}
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};
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}
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