ClickHouse/dbms/Dictionaries/DictionaryStructure.cpp
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

358 lines
13 KiB
C++

#include "DictionaryStructure.h"
#include <Columns/IColumn.h>
#include <DataTypes/DataTypeFactory.h>
#include <DataTypes/DataTypeNullable.h>
#include <Formats/FormatSettings.h>
#include <IO/WriteHelpers.h>
#include <Common/StringUtils/StringUtils.h>
#include <numeric>
#include <unordered_map>
#include <unordered_set>
#include <ext/range.h>
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_TYPE;
extern const int ARGUMENT_OUT_OF_BOUND;
extern const int TYPE_MISMATCH;
extern const int BAD_ARGUMENTS;
}
namespace
{
DictionaryTypedSpecialAttribute makeDictionaryTypedSpecialAttribute(
const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix, const std::string & default_type)
{
const auto name = config.getString(config_prefix + ".name", "");
const auto expression = config.getString(config_prefix + ".expression", "");
if (name.empty() && !expression.empty())
throw Exception{"Element " + config_prefix + ".name is empty", ErrorCodes::BAD_ARGUMENTS};
const auto type_name = config.getString(config_prefix + ".type", default_type);
return DictionaryTypedSpecialAttribute{std::move(name), std::move(expression), DataTypeFactory::instance().get(type_name)};
}
}
AttributeUnderlyingType getAttributeUnderlyingType(const std::string & type)
{
static const std::unordered_map<std::string, AttributeUnderlyingType> dictionary{
{"UInt8", AttributeUnderlyingType::utUInt8},
{"UInt16", AttributeUnderlyingType::utUInt16},
{"UInt32", AttributeUnderlyingType::utUInt32},
{"UInt64", AttributeUnderlyingType::utUInt64},
{"UUID", AttributeUnderlyingType::utUInt128},
{"Int8", AttributeUnderlyingType::utInt8},
{"Int16", AttributeUnderlyingType::utInt16},
{"Int32", AttributeUnderlyingType::utInt32},
{"Int64", AttributeUnderlyingType::utInt64},
{"Float32", AttributeUnderlyingType::utFloat32},
{"Float64", AttributeUnderlyingType::utFloat64},
{"String", AttributeUnderlyingType::utString},
{"Date", AttributeUnderlyingType::utUInt16},
{"DateTime", AttributeUnderlyingType::utUInt32},
};
const auto it = dictionary.find(type);
if (it != std::end(dictionary))
return it->second;
if (type.find("Decimal") == 0)
{
size_t start = strlen("Decimal");
if (type.find("32", start) == start)
return AttributeUnderlyingType::utDecimal32;
if (type.find("64", start) == start)
return AttributeUnderlyingType::utDecimal64;
if (type.find("128", start) == start)
return AttributeUnderlyingType::utDecimal128;
}
// Temporary hack to allow arrays in keys, since they are never retrieved for polygon dictionaries.
// TODO: This should be fixed by fully supporting arrays in dictionaries.
if (type.find("Array") == 0)
return AttributeUnderlyingType::utString;
throw Exception{"Unknown type " + type, ErrorCodes::UNKNOWN_TYPE};
}
std::string toString(const AttributeUnderlyingType type)
{
switch (type)
{
case AttributeUnderlyingType::utUInt8:
return "UInt8";
case AttributeUnderlyingType::utUInt16:
return "UInt16";
case AttributeUnderlyingType::utUInt32:
return "UInt32";
case AttributeUnderlyingType::utUInt64:
return "UInt64";
case AttributeUnderlyingType::utUInt128:
return "UUID";
case AttributeUnderlyingType::utInt8:
return "Int8";
case AttributeUnderlyingType::utInt16:
return "Int16";
case AttributeUnderlyingType::utInt32:
return "Int32";
case AttributeUnderlyingType::utInt64:
return "Int64";
case AttributeUnderlyingType::utFloat32:
return "Float32";
case AttributeUnderlyingType::utFloat64:
return "Float64";
case AttributeUnderlyingType::utDecimal32:
return "Decimal32";
case AttributeUnderlyingType::utDecimal64:
return "Decimal64";
case AttributeUnderlyingType::utDecimal128:
return "Decimal128";
case AttributeUnderlyingType::utString:
return "String";
}
throw Exception{"Unknown attribute_type " + toString(static_cast<int>(type)), ErrorCodes::ARGUMENT_OUT_OF_BOUND};
}
DictionarySpecialAttribute::DictionarySpecialAttribute(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix)
: name{config.getString(config_prefix + ".name", "")}, expression{config.getString(config_prefix + ".expression", "")}
{
if (name.empty() && !expression.empty())
throw Exception{"Element " + config_prefix + ".name is empty", ErrorCodes::BAD_ARGUMENTS};
}
DictionaryStructure::DictionaryStructure(const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix)
{
const auto has_id = config.has(config_prefix + ".id");
const auto has_key = config.has(config_prefix + ".key");
if (has_key && has_id)
throw Exception{"Only one of 'id' and 'key' should be specified", ErrorCodes::BAD_ARGUMENTS};
if (has_id)
id.emplace(config, config_prefix + ".id");
else if (has_key)
{
key.emplace(getAttributes(config, config_prefix + ".key", false, false));
if (key->empty())
throw Exception{"Empty 'key' supplied", ErrorCodes::BAD_ARGUMENTS};
}
else
throw Exception{"Dictionary structure should specify either 'id' or 'key'", ErrorCodes::BAD_ARGUMENTS};
if (id)
{
if (id->name.empty())
throw Exception{"'id' cannot be empty", ErrorCodes::BAD_ARGUMENTS};
const auto range_default_type = "Date";
if (config.has(config_prefix + ".range_min"))
range_min.emplace(makeDictionaryTypedSpecialAttribute(config, config_prefix + ".range_min", range_default_type));
if (config.has(config_prefix + ".range_max"))
range_max.emplace(makeDictionaryTypedSpecialAttribute(config, config_prefix + ".range_max", range_default_type));
if (range_min.has_value() != range_max.has_value())
{
throw Exception{"Dictionary structure should have both 'range_min' and 'range_max' either specified or not.",
ErrorCodes::BAD_ARGUMENTS};
}
if (range_min && range_max && !range_min->type->equals(*range_max->type))
{
throw Exception{"Dictionary structure 'range_min' and 'range_max' should have same type, "
"'range_min' type: "
+ range_min->type->getName()
+ ", "
"'range_max' type: "
+ range_max->type->getName(),
ErrorCodes::BAD_ARGUMENTS};
}
if (range_min)
{
if (!range_min->type->isValueRepresentedByInteger())
throw Exception{"Dictionary structure type of 'range_min' and 'range_max' should be an integer, Date, DateTime, or Enum."
" Actual 'range_min' and 'range_max' type is "
+ range_min->type->getName(),
ErrorCodes::BAD_ARGUMENTS};
}
if (!id->expression.empty() || (range_min && !range_min->expression.empty()) || (range_max && !range_max->expression.empty()))
has_expressions = true;
}
attributes = getAttributes(config, config_prefix);
if (attributes.empty())
throw Exception{"Dictionary has no attributes defined", ErrorCodes::BAD_ARGUMENTS};
}
void DictionaryStructure::validateKeyTypes(const DataTypes & key_types) const
{
if (key_types.size() != key->size())
throw Exception{"Key structure does not match, expected " + getKeyDescription(), ErrorCodes::TYPE_MISMATCH};
for (const auto i : ext::range(0, key_types.size()))
{
const auto & expected_type = (*key)[i].type->getName();
const auto & actual_type = key_types[i]->getName();
if (expected_type != actual_type)
throw Exception{"Key type at position " + std::to_string(i) + " does not match, expected " + expected_type + ", found "
+ actual_type,
ErrorCodes::TYPE_MISMATCH};
}
}
std::string DictionaryStructure::getKeyDescription() const
{
if (id)
return "UInt64";
std::ostringstream out;
out << '(';
auto first = true;
for (const auto & key_i : *key)
{
if (!first)
out << ", ";
first = false;
out << key_i.type->getName();
}
out << ')';
return out.str();
}
bool DictionaryStructure::isKeySizeFixed() const
{
if (!key)
return true;
for (const auto & key_i : *key)
if (key_i.underlying_type == AttributeUnderlyingType::utString)
return false;
return true;
}
size_t DictionaryStructure::getKeySize() const
{
return std::accumulate(std::begin(*key), std::end(*key), size_t{}, [](const auto running_size, const auto & key_i)
{
return running_size + key_i.type->getSizeOfValueInMemory();
});
}
static void checkAttributeKeys(const Poco::Util::AbstractConfiguration::Keys & keys)
{
static const std::unordered_set<std::string> valid_keys
= {"name", "type", "expression", "null_value", "hierarchical", "injective", "is_object_id"};
for (const auto & key : keys)
{
if (valid_keys.find(key) == valid_keys.end())
throw Exception{"Unknown key '" + key + "' inside attribute section", ErrorCodes::BAD_ARGUMENTS};
}
}
std::vector<DictionaryAttribute> DictionaryStructure::getAttributes(
const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix,
const bool hierarchy_allowed,
const bool allow_null_values)
{
Poco::Util::AbstractConfiguration::Keys config_elems;
config.keys(config_prefix, config_elems);
auto has_hierarchy = false;
std::vector<DictionaryAttribute> res_attributes;
const FormatSettings format_settings;
for (const auto & config_elem : config_elems)
{
if (!startsWith(config_elem, "attribute"))
continue;
const auto prefix = config_prefix + '.' + config_elem + '.';
Poco::Util::AbstractConfiguration::Keys attribute_keys;
config.keys(config_prefix + '.' + config_elem, attribute_keys);
checkAttributeKeys(attribute_keys);
const auto name = config.getString(prefix + "name");
const auto type_string = config.getString(prefix + "type");
const auto type = DataTypeFactory::instance().get(type_string);
const auto underlying_type = getAttributeUnderlyingType(type_string);
const auto expression = config.getString(prefix + "expression", "");
if (!expression.empty())
has_expressions = true;
Field null_value;
if (allow_null_values)
{
const auto null_value_string = config.getString(prefix + "null_value");
try
{
if (null_value_string.empty())
null_value = type->getDefault();
else
{
ReadBufferFromString null_value_buffer{null_value_string};
auto column_with_null_value = type->createColumn();
type->deserializeAsTextEscaped(*column_with_null_value, null_value_buffer, format_settings);
null_value = (*column_with_null_value)[0];
}
}
catch (Exception & e)
{
e.addMessage("error parsing null_value");
throw;
}
}
const auto hierarchical = config.getBool(prefix + "hierarchical", false);
const auto injective = config.getBool(prefix + "injective", false);
const auto is_object_id = config.getBool(prefix + "is_object_id", false);
if (name.empty())
throw Exception{"Properties 'name' and 'type' of an attribute cannot be empty", ErrorCodes::BAD_ARGUMENTS};
if (has_hierarchy && !hierarchy_allowed)
throw Exception{"Hierarchy not allowed in '" + prefix, ErrorCodes::BAD_ARGUMENTS};
if (has_hierarchy && hierarchical)
throw Exception{"Only one hierarchical attribute supported", ErrorCodes::BAD_ARGUMENTS};
has_hierarchy = has_hierarchy || hierarchical;
res_attributes.emplace_back(
DictionaryAttribute{name, underlying_type, type, expression, null_value, hierarchical, injective, is_object_id});
}
return res_attributes;
}
}