mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-18 22:40:50 +00:00
425 lines
16 KiB
C++
425 lines
16 KiB
C++
#include <unordered_set>
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#include <IO/WriteBufferFromString.h>
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#include <IO/Operators.h>
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#include <Common/typeid_cast.h>
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#include <DataTypes/getLeastSupertype.h>
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/DataTypeTuple.h>
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#include <DataTypes/DataTypeNullable.h>
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#include <DataTypes/DataTypeNothing.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypeDateTime64.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypesDecimal.h>
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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 NO_COMMON_TYPE;
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}
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namespace
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{
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String getExceptionMessagePrefix(const DataTypes & types)
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{
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WriteBufferFromOwnString res;
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res << "There is no supertype for types ";
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bool first = true;
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for (const auto & type : types)
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{
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if (!first)
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res << ", ";
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first = false;
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res << type->getName();
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}
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return res.str();
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}
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}
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DataTypePtr getLeastSupertype(const DataTypes & types)
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{
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/// Trivial cases
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if (types.empty())
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return std::make_shared<DataTypeNothing>();
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if (types.size() == 1)
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return types[0];
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/// All types are equal
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{
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bool all_equal = true;
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for (size_t i = 1, size = types.size(); i < size; ++i)
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{
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if (!types[i]->equals(*types[0]))
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{
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all_equal = false;
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break;
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}
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}
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if (all_equal)
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return types[0];
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}
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/// Recursive rules
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/// If there are Nothing types, skip them
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{
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DataTypes non_nothing_types;
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non_nothing_types.reserve(types.size());
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for (const auto & type : types)
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if (!typeid_cast<const DataTypeNothing *>(type.get()))
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non_nothing_types.emplace_back(type);
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if (non_nothing_types.size() < types.size())
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return getLeastSupertype(non_nothing_types);
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}
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/// For Arrays
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{
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bool have_array = false;
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bool all_arrays = true;
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DataTypes nested_types;
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nested_types.reserve(types.size());
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for (const auto & type : types)
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{
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if (const DataTypeArray * type_array = typeid_cast<const DataTypeArray *>(type.get()))
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{
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have_array = true;
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nested_types.emplace_back(type_array->getNestedType());
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}
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else
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all_arrays = false;
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}
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if (have_array)
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{
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if (!all_arrays)
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throw Exception(getExceptionMessagePrefix(types) + " because some of them are Array and some of them are not", ErrorCodes::NO_COMMON_TYPE);
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return std::make_shared<DataTypeArray>(getLeastSupertype(nested_types));
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}
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}
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/// For tuples
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{
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bool have_tuple = false;
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bool all_tuples = true;
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size_t tuple_size = 0;
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std::vector<DataTypes> nested_types;
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for (const auto & type : types)
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{
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if (const DataTypeTuple * type_tuple = typeid_cast<const DataTypeTuple *>(type.get()))
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{
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if (!have_tuple)
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{
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tuple_size = type_tuple->getElements().size();
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nested_types.resize(tuple_size);
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for (size_t elem_idx = 0; elem_idx < tuple_size; ++elem_idx)
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nested_types[elem_idx].reserve(types.size());
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}
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else if (tuple_size != type_tuple->getElements().size())
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throw Exception(getExceptionMessagePrefix(types) + " because Tuples have different sizes", ErrorCodes::NO_COMMON_TYPE);
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have_tuple = true;
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for (size_t elem_idx = 0; elem_idx < tuple_size; ++elem_idx)
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nested_types[elem_idx].emplace_back(type_tuple->getElements()[elem_idx]);
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}
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else
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all_tuples = false;
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}
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if (have_tuple)
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{
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if (!all_tuples)
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throw Exception(getExceptionMessagePrefix(types) + " because some of them are Tuple and some of them are not", ErrorCodes::NO_COMMON_TYPE);
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DataTypes common_tuple_types(tuple_size);
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for (size_t elem_idx = 0; elem_idx < tuple_size; ++elem_idx)
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common_tuple_types[elem_idx] = getLeastSupertype(nested_types[elem_idx]);
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return std::make_shared<DataTypeTuple>(common_tuple_types);
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}
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}
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/// For Nullable
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{
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bool have_nullable = false;
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DataTypes nested_types;
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nested_types.reserve(types.size());
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for (const auto & type : types)
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{
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if (const DataTypeNullable * type_nullable = typeid_cast<const DataTypeNullable *>(type.get()))
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{
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have_nullable = true;
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if (!type_nullable->onlyNull())
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nested_types.emplace_back(type_nullable->getNestedType());
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}
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else
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nested_types.emplace_back(type);
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}
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if (have_nullable)
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{
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return std::make_shared<DataTypeNullable>(getLeastSupertype(nested_types));
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}
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}
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/// Non-recursive rules
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std::unordered_set<TypeIndex> type_ids;
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for (const auto & type : types)
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type_ids.insert(type->getTypeId());
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/// For String and FixedString, or for different FixedStrings, the common type is String.
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/// No other types are compatible with Strings. TODO Enums?
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{
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UInt32 have_string = type_ids.count(TypeIndex::String);
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UInt32 have_fixed_string = type_ids.count(TypeIndex::FixedString);
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if (have_string || have_fixed_string)
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{
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bool all_strings = type_ids.size() == (have_string + have_fixed_string);
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if (!all_strings)
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throw Exception(getExceptionMessagePrefix(types) + " because some of them are String/FixedString and some of them are not", ErrorCodes::NO_COMMON_TYPE);
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return std::make_shared<DataTypeString>();
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}
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}
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/// For Date and DateTime, the common type is DateTime. No other types are compatible.
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{
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UInt32 have_date = type_ids.count(TypeIndex::Date);
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UInt32 have_datetime = type_ids.count(TypeIndex::DateTime);
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UInt32 have_datetime64 = type_ids.count(TypeIndex::DateTime64);
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if (have_date || have_datetime || have_datetime64)
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{
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bool all_date_or_datetime = type_ids.size() == (have_date + have_datetime + have_datetime64);
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if (!all_date_or_datetime)
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throw Exception(getExceptionMessagePrefix(types) + " because some of them are Date/DateTime and some of them are not", ErrorCodes::NO_COMMON_TYPE);
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if (have_datetime64 == 0)
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{
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return std::make_shared<DataTypeDateTime>();
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}
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// When DateTime64 involved, make sure that supertype has whole-part precision
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// big enough to hold max whole-value of any type from `types`.
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// That would sacrifice scale when comparing DateTime64 of different scales.
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UInt32 max_datetime64_whole_precision = 0;
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for (const auto & t : types)
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{
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if (auto dt64 = typeid_cast<const DataTypeDateTime64 *>(t.get()))
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{
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const auto whole_precision = dt64->getPrecision() - dt64->getScale();
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max_datetime64_whole_precision = std::max(whole_precision, max_datetime64_whole_precision);
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}
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}
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UInt32 least_decimal_precision = 0;
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if (have_datetime)
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{
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least_decimal_precision = leastDecimalPrecisionFor(TypeIndex::UInt32);
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}
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else if (have_date)
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{
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least_decimal_precision = leastDecimalPrecisionFor(TypeIndex::UInt16);
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}
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max_datetime64_whole_precision = std::max(least_decimal_precision, max_datetime64_whole_precision);
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const UInt32 scale = DataTypeDateTime64::maxPrecision() - max_datetime64_whole_precision;
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return std::make_shared<DataTypeDateTime64>(scale);
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}
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}
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/// Decimals
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{
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UInt32 have_decimal32 = type_ids.count(TypeIndex::Decimal32);
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UInt32 have_decimal64 = type_ids.count(TypeIndex::Decimal64);
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UInt32 have_decimal128 = type_ids.count(TypeIndex::Decimal128);
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if (have_decimal32 || have_decimal64 || have_decimal128)
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{
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UInt32 num_supported = have_decimal32 + have_decimal64 + have_decimal128;
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std::vector<TypeIndex> int_ids = {TypeIndex::Int8, TypeIndex::UInt8, TypeIndex::Int16, TypeIndex::UInt16,
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TypeIndex::Int32, TypeIndex::UInt32, TypeIndex::Int64, TypeIndex::UInt64};
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std::vector<UInt32> num_ints(int_ids.size(), 0);
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TypeIndex max_int = TypeIndex::Nothing;
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for (size_t i = 0; i < int_ids.size(); ++i)
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{
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UInt32 num = type_ids.count(int_ids[i]);
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num_ints[i] = num;
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num_supported += num;
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if (num)
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max_int = int_ids[i];
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}
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if (num_supported != type_ids.size())
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throw Exception(getExceptionMessagePrefix(types) + " because some of them have no lossless convertion to Decimal",
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ErrorCodes::NO_COMMON_TYPE);
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UInt32 max_scale = 0;
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for (const auto & type : types)
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{
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UInt32 scale = getDecimalScale(*type, 0);
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if (scale > max_scale)
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max_scale = scale;
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}
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UInt32 min_precision = max_scale + leastDecimalPrecisionFor(max_int);
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/// special cases Int32 -> Dec32, Int64 -> Dec64
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if (max_scale == 0)
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{
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if (max_int == TypeIndex::Int32)
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min_precision = DataTypeDecimal<Decimal32>::maxPrecision();
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else if (max_int == TypeIndex::Int64)
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min_precision = DataTypeDecimal<Decimal64>::maxPrecision();
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}
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if (min_precision > DataTypeDecimal<Decimal128>::maxPrecision())
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throw Exception(getExceptionMessagePrefix(types) + " because the least supertype is Decimal("
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+ toString(min_precision) + ',' + toString(max_scale) + ')',
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ErrorCodes::NO_COMMON_TYPE);
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if (have_decimal128 || min_precision > DataTypeDecimal<Decimal64>::maxPrecision())
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return std::make_shared<DataTypeDecimal<Decimal128>>(DataTypeDecimal<Decimal128>::maxPrecision(), max_scale);
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if (have_decimal64 || min_precision > DataTypeDecimal<Decimal32>::maxPrecision())
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return std::make_shared<DataTypeDecimal<Decimal64>>(DataTypeDecimal<Decimal64>::maxPrecision(), max_scale);
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return std::make_shared<DataTypeDecimal<Decimal32>>(DataTypeDecimal<Decimal32>::maxPrecision(), max_scale);
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}
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}
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/// For numeric types, the most complicated part.
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{
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bool all_numbers = true;
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size_t max_bits_of_signed_integer = 0;
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size_t max_bits_of_unsigned_integer = 0;
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size_t max_mantissa_bits_of_floating = 0;
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auto maximize = [](size_t & what, size_t value)
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{
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if (value > what)
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what = value;
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};
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for (const auto & type : types)
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{
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if (typeid_cast<const DataTypeUInt8 *>(type.get()))
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maximize(max_bits_of_unsigned_integer, 8);
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else if (typeid_cast<const DataTypeUInt16 *>(type.get()))
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maximize(max_bits_of_unsigned_integer, 16);
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else if (typeid_cast<const DataTypeUInt32 *>(type.get()))
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maximize(max_bits_of_unsigned_integer, 32);
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else if (typeid_cast<const DataTypeUInt64 *>(type.get()))
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maximize(max_bits_of_unsigned_integer, 64);
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else if (typeid_cast<const DataTypeInt8 *>(type.get()))
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maximize(max_bits_of_signed_integer, 8);
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else if (typeid_cast<const DataTypeInt16 *>(type.get()))
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maximize(max_bits_of_signed_integer, 16);
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else if (typeid_cast<const DataTypeInt32 *>(type.get()))
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maximize(max_bits_of_signed_integer, 32);
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else if (typeid_cast<const DataTypeInt64 *>(type.get()))
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maximize(max_bits_of_signed_integer, 64);
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else if (typeid_cast<const DataTypeFloat32 *>(type.get()))
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maximize(max_mantissa_bits_of_floating, 24);
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else if (typeid_cast<const DataTypeFloat64 *>(type.get()))
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maximize(max_mantissa_bits_of_floating, 53);
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else
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all_numbers = false;
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}
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if (max_bits_of_signed_integer || max_bits_of_unsigned_integer || max_mantissa_bits_of_floating)
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{
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if (!all_numbers)
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throw Exception(getExceptionMessagePrefix(types) + " because some of them are numbers and some of them are not", ErrorCodes::NO_COMMON_TYPE);
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/// If there are signed and unsigned types of same bit-width, the result must be signed number with at least one more bit.
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/// Example, common of Int32, UInt32 = Int64.
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size_t min_bit_width_of_integer = std::max(max_bits_of_signed_integer, max_bits_of_unsigned_integer);
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/// If unsigned is not covered by signed.
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if (max_bits_of_signed_integer && max_bits_of_unsigned_integer >= max_bits_of_signed_integer)
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++min_bit_width_of_integer;
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/// If the result must be floating.
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if (max_mantissa_bits_of_floating)
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{
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size_t min_mantissa_bits = std::max(min_bit_width_of_integer, max_mantissa_bits_of_floating);
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if (min_mantissa_bits <= 24)
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return std::make_shared<DataTypeFloat32>();
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else if (min_mantissa_bits <= 53)
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return std::make_shared<DataTypeFloat64>();
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else
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throw Exception(getExceptionMessagePrefix(types)
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+ " because some of them are integers and some are floating point,"
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" but there is no floating point type, that can exactly represent all required integers", ErrorCodes::NO_COMMON_TYPE);
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}
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/// If the result must be signed integer.
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if (max_bits_of_signed_integer)
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{
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if (min_bit_width_of_integer <= 8)
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return std::make_shared<DataTypeInt8>();
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else if (min_bit_width_of_integer <= 16)
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return std::make_shared<DataTypeInt16>();
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else if (min_bit_width_of_integer <= 32)
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return std::make_shared<DataTypeInt32>();
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else if (min_bit_width_of_integer <= 64)
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return std::make_shared<DataTypeInt64>();
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else
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throw Exception(getExceptionMessagePrefix(types)
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+ " because some of them are signed integers and some are unsigned integers,"
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" but there is no signed integer type, that can exactly represent all required unsigned integer values", ErrorCodes::NO_COMMON_TYPE);
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}
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/// All unsigned.
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{
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if (min_bit_width_of_integer <= 8)
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return std::make_shared<DataTypeUInt8>();
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else if (min_bit_width_of_integer <= 16)
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return std::make_shared<DataTypeUInt16>();
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else if (min_bit_width_of_integer <= 32)
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return std::make_shared<DataTypeUInt32>();
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else if (min_bit_width_of_integer <= 64)
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return std::make_shared<DataTypeUInt64>();
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else
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throw Exception("Logical error: " + getExceptionMessagePrefix(types)
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+ " but as all data types are unsigned integers, we must have found maximum unsigned integer type", ErrorCodes::NO_COMMON_TYPE);
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}
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}
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}
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/// All other data types (UUID, AggregateFunction, Enum...) are compatible only if they are the same (checked in trivial cases).
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throw Exception(getExceptionMessagePrefix(types), ErrorCodes::NO_COMMON_TYPE);
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}
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}
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