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93 lines
3.6 KiB
C++
93 lines
3.6 KiB
C++
#include <Functions/IFunction.h>
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#include <Functions/FunctionFactory.h>
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeDate.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypeString.h>
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#include <Columns/ColumnArray.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnsNumber.h>
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namespace DB
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{
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/// TODO Make it simple.
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template <typename Type> struct TypeToColumnType { using ColumnType = ColumnVector<Type>; };
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template <> struct TypeToColumnType<String> { using ColumnType = ColumnString; };
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template <typename DataType> struct DataTypeToName : TypeName<typename DataType::FieldType> { };
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template <> struct DataTypeToName<DataTypeDate> { static std::string get() { return "Date"; } };
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template <> struct DataTypeToName<DataTypeDateTime> { static std::string get() { return "DateTime"; } };
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template <typename DataType>
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struct FunctionEmptyArray : public IFunction
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{
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static constexpr auto base_name = "emptyArray";
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static const String name;
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionEmptyArray>(); }
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private:
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String getName() const override
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{
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return name;
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}
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size_t getNumberOfArguments() const override { return 0; }
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DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
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{
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return std::make_shared<DataTypeArray>(std::make_shared<DataType>());
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}
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void executeImpl(Block & block, const ColumnNumbers &, size_t result, size_t input_rows_count) override
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{
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using UnderlyingColumnType = typename TypeToColumnType<typename DataType::FieldType>::ColumnType;
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block.getByPosition(result).column = ColumnArray::create(
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UnderlyingColumnType::create(),
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ColumnArray::ColumnOffsets::create(input_rows_count, 0));
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}
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};
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template <typename DataType>
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const String FunctionEmptyArray<DataType>::name = FunctionEmptyArray::base_name + String(DataTypeToName<DataType>::get());
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using FunctionEmptyArrayUInt8 = FunctionEmptyArray<DataTypeUInt8>;
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using FunctionEmptyArrayUInt16 = FunctionEmptyArray<DataTypeUInt16>;
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using FunctionEmptyArrayUInt32 = FunctionEmptyArray<DataTypeUInt32>;
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using FunctionEmptyArrayUInt64 = FunctionEmptyArray<DataTypeUInt64>;
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using FunctionEmptyArrayInt8 = FunctionEmptyArray<DataTypeInt8>;
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using FunctionEmptyArrayInt16 = FunctionEmptyArray<DataTypeInt16>;
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using FunctionEmptyArrayInt32 = FunctionEmptyArray<DataTypeInt32>;
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using FunctionEmptyArrayInt64 = FunctionEmptyArray<DataTypeInt64>;
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using FunctionEmptyArrayFloat32 = FunctionEmptyArray<DataTypeFloat32>;
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using FunctionEmptyArrayFloat64 = FunctionEmptyArray<DataTypeFloat64>;
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using FunctionEmptyArrayDate = FunctionEmptyArray<DataTypeDate>;
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using FunctionEmptyArrayDateTime = FunctionEmptyArray<DataTypeDateTime>;
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using FunctionEmptyArrayString = FunctionEmptyArray<DataTypeString>;
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void registerFunctionsEmptyArray(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionEmptyArrayUInt8>();
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factory.registerFunction<FunctionEmptyArrayUInt16>();
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factory.registerFunction<FunctionEmptyArrayUInt32>();
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factory.registerFunction<FunctionEmptyArrayUInt64>();
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factory.registerFunction<FunctionEmptyArrayInt8>();
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factory.registerFunction<FunctionEmptyArrayInt16>();
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factory.registerFunction<FunctionEmptyArrayInt32>();
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factory.registerFunction<FunctionEmptyArrayInt64>();
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factory.registerFunction<FunctionEmptyArrayFloat32>();
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factory.registerFunction<FunctionEmptyArrayFloat64>();
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factory.registerFunction<FunctionEmptyArrayDate>();
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factory.registerFunction<FunctionEmptyArrayDateTime>();
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factory.registerFunction<FunctionEmptyArrayString>();
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}
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}
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