ClickHouse/dbms/src/Dictionaries/ExternalResultDescription.cpp
2018-05-07 05:01:11 +03:00

75 lines
2.7 KiB
C++

#include <ext/range.h>
#include <Dictionaries/ExternalResultDescription.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <Common/typeid_cast.h>
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_TYPE;
}
void ExternalResultDescription::init(const Block & sample_block_)
{
sample_block = sample_block_;
const auto num_columns = sample_block.columns();
types.reserve(num_columns);
names.reserve(num_columns);
sample_columns.reserve(num_columns);
for (const auto idx : ext::range(0, num_columns))
{
const auto & column = sample_block.safeGetByPosition(idx);
const auto type = column.type.get();
if (typeid_cast<const DataTypeUInt8 *>(type))
types.push_back(ValueType::UInt8);
else if (typeid_cast<const DataTypeUInt16 *>(type))
types.push_back(ValueType::UInt16);
else if (typeid_cast<const DataTypeUInt32 *>(type))
types.push_back(ValueType::UInt32);
else if (typeid_cast<const DataTypeUInt64 *>(type))
types.push_back(ValueType::UInt64);
else if (typeid_cast<const DataTypeInt8 *>(type))
types.push_back(ValueType::Int8);
else if (typeid_cast<const DataTypeInt16 *>(type))
types.push_back(ValueType::Int16);
else if (typeid_cast<const DataTypeInt32 *>(type))
types.push_back(ValueType::Int32);
else if (typeid_cast<const DataTypeInt64 *>(type))
types.push_back(ValueType::Int64);
else if (typeid_cast<const DataTypeFloat32 *>(type))
types.push_back(ValueType::Float32);
else if (typeid_cast<const DataTypeFloat64 *>(type))
types.push_back(ValueType::Float64);
else if (typeid_cast<const DataTypeString *>(type))
types.push_back(ValueType::String);
else if (typeid_cast<const DataTypeDate *>(type))
types.push_back(ValueType::Date);
else if (typeid_cast<const DataTypeDateTime *>(type))
types.push_back(ValueType::DateTime);
else
throw Exception{"Unsupported type " + type->getName(), ErrorCodes::UNKNOWN_TYPE};
names.emplace_back(column.name);
sample_columns.emplace_back(column.column);
/// If default value for column was not provided, use default from data type.
if (sample_columns.back()->empty())
{
MutableColumnPtr mutable_column = (*std::move(sample_columns.back())).mutate();
column.type->insertDefaultInto(*mutable_column);
sample_columns.back() = std::move(mutable_column);
}
}
}
}