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216 lines
7.3 KiB
C++
216 lines
7.3 KiB
C++
#include <Interpreters/convertFieldToType.h>
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#include <IO/ReadBufferFromString.h>
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#include <IO/ReadHelpers.h>
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypeFixedString.h>
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#include <DataTypes/DataTypeDate.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypeEnum.h>
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#include <DataTypes/DataTypeNullable.h>
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#include <DataTypes/DataTypeTraits.h>
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#include <Core/AccurateComparison.h>
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#include <Core/FieldVisitors.h>
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#include <DataTypes/DataTypeUUID.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 LOGICAL_ERROR;
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extern const int TYPE_MISMATCH;
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}
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/** Checking for a `Field from` of `From` type falls to a range of values of type `To`.
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* `From` and `To` - numeric types. They can be floating-point types.
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* `From` is one of UInt64, Int64, Float64,
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* whereas `To` can also be 8, 16, 32 bit.
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*
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* If falls into a range, then `from` is converted to the `Field` closest to the `To` type.
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* If not, return Field(Null).
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*/
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namespace
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{
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template <typename From, typename To>
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static Field convertNumericTypeImpl(const Field & from)
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{
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From value = from.get<From>();
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if (!accurate::equalsOp(value, To(value)))
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return {};
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return Field(typename NearestFieldType<To>::Type(value));
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}
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template <typename To>
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static Field convertNumericType(const Field & from, const IDataType & type)
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{
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if (from.getType() == Field::Types::UInt64)
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return convertNumericTypeImpl<UInt64, To>(from);
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if (from.getType() == Field::Types::Int64)
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return convertNumericTypeImpl<Int64, To>(from);
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if (from.getType() == Field::Types::Float64)
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return convertNumericTypeImpl<Float64, To>(from);
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throw Exception("Type mismatch in IN or VALUES section. Expected: " + type.getName() + ". Got: "
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+ Field::Types::toString(from.getType()), ErrorCodes::TYPE_MISMATCH);
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}
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DayNum_t stringToDate(const String & s)
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{
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ReadBufferFromString in(s);
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DayNum_t date{};
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readDateText(date, in);
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if (!in.eof())
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throw Exception("String is too long for Date: " + s);
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return date;
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}
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UInt64 stringToDateTime(const String & s)
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{
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ReadBufferFromString in(s);
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time_t date_time{};
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readDateTimeText(date_time, in);
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if (!in.eof())
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throw Exception("String is too long for DateTime: " + s);
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return UInt64(date_time);
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}
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UUID stringToUUID(const String & s)
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{
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ReadBufferFromString in(s);
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UUID uuid;
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readText(uuid, in);
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if (!in.eof())
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throw Exception("String is too long for UUID: " + s);
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return uuid;
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}
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Field convertFieldToTypeImpl(const Field & src, const IDataType & type)
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{
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if (type.isNumeric())
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{
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if (typeid_cast<const DataTypeUInt8 *>(&type)) return convertNumericType<UInt8>(src, type);
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if (typeid_cast<const DataTypeUInt16 *>(&type)) return convertNumericType<UInt16>(src, type);
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if (typeid_cast<const DataTypeUInt32 *>(&type)) return convertNumericType<UInt32>(src, type);
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if (typeid_cast<const DataTypeUInt64 *>(&type)) return convertNumericType<UInt64>(src, type);
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if (typeid_cast<const DataTypeInt8 *>(&type)) return convertNumericType<Int8>(src, type);
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if (typeid_cast<const DataTypeInt16 *>(&type)) return convertNumericType<Int16>(src, type);
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if (typeid_cast<const DataTypeInt32 *>(&type)) return convertNumericType<Int32>(src, type);
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if (typeid_cast<const DataTypeInt64 *>(&type)) return convertNumericType<Int64>(src, type);
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if (typeid_cast<const DataTypeFloat32 *>(&type)) return convertNumericType<Float32>(src, type);
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if (typeid_cast<const DataTypeFloat64 *>(&type)) return convertNumericType<Float64>(src, type);
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const bool is_date = typeid_cast<const DataTypeDate *>(&type);
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bool is_datetime = false;
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bool is_enum = false;
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bool is_uuid = false;
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if (!is_date)
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if (!(is_datetime = typeid_cast<const DataTypeDateTime *>(&type)))
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if (!(is_uuid = typeid_cast<const DataTypeUUID *>(&type)))
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if (!(is_enum = dynamic_cast<const IDataTypeEnum *>(&type)))
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throw Exception{"Logical error: unknown numeric type " + type.getName(), ErrorCodes::LOGICAL_ERROR};
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/// Numeric values for Enums should not be used directly in IN section
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if (src.getType() == Field::Types::UInt64 && !is_enum)
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return src;
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if (src.getType() == Field::Types::String)
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{
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if (is_date)
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{
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/// Convert 'YYYY-MM-DD' Strings to Date
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return UInt64(stringToDate(src.get<const String &>()));
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}
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else if (is_datetime)
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{
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/// Convert 'YYYY-MM-DD hh:mm:ss' Strings to DateTime
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return stringToDateTime(src.get<const String &>());
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}
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else if (is_uuid)
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{
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return stringToUUID(src.get<const String &>());
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}
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else if (is_enum)
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{
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/// Convert String to Enum's value
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return dynamic_cast<const IDataTypeEnum &>(type).castToValue(src);
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}
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}
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throw Exception("Type mismatch in IN or VALUES section. Expected: " + type.getName() + ". Got: "
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+ Field::Types::toString(src.getType()), ErrorCodes::TYPE_MISMATCH);
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}
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else if (const DataTypeArray * type_array = typeid_cast<const DataTypeArray *>(&type))
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{
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if (src.getType() != Field::Types::Array)
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throw Exception("Type mismatch in IN or VALUES section. Expected: " + type.getName() + ". Got: "
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+ Field::Types::toString(src.getType()), ErrorCodes::TYPE_MISMATCH);
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const IDataType & nested_type = *DataTypeTraits::removeNullable(type_array->getNestedType());
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const Array & src_arr = src.get<Array>();
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size_t src_arr_size = src_arr.size();
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Array res(src_arr_size);
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for (size_t i = 0; i < src_arr_size; ++i)
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res[i] = convertFieldToType(src_arr[i], nested_type);
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return res;
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}
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else
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{
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if (src.getType() == Field::Types::UInt64
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|| src.getType() == Field::Types::Int64
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|| src.getType() == Field::Types::Float64
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|| src.getType() == Field::Types::Array
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|| (src.getType() == Field::Types::String
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&& !typeid_cast<const DataTypeString *>(&type)
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&& !typeid_cast<const DataTypeFixedString *>(&type)))
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throw Exception("Type mismatch in IN or VALUES section. Expected: " + type.getName() + ". Got: "
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+ Field::Types::toString(src.getType()), ErrorCodes::TYPE_MISMATCH);
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}
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return src;
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}
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}
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Field convertFieldToType(const Field & from_value, const IDataType & to_type, const IDataType * from_type_hint)
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{
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if (from_value.isNull())
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return from_value;
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if (from_type_hint && from_type_hint->equals(to_type))
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return from_value;
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if (to_type.isNullable())
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{
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const DataTypeNullable & nullable_type = static_cast<const DataTypeNullable &>(to_type);
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const DataTypePtr & nested_type = nullable_type.getNestedType();
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return convertFieldToTypeImpl(from_value, *nested_type);
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}
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else
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return convertFieldToTypeImpl(from_value, to_type);
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}
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}
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