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Add repeat function
This commit is contained in:
fenglv
parent
b289d7e6a5
commit
2062bedaf0
@ -4,6 +4,7 @@ namespace DB
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{
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class FunctionFactory;
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void registerFunctionRepeat(FunctionFactory &);
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void registerFunctionEmpty(FunctionFactory &);
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void registerFunctionNotEmpty(FunctionFactory &);
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void registerFunctionLength(FunctionFactory &);
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@ -34,6 +35,7 @@ void registerFunctionTryBase64Decode(FunctionFactory &);
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void registerFunctionsString(FunctionFactory & factory)
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{
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registerFunctionRepeat(factory);
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registerFunctionEmpty(factory);
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registerFunctionNotEmpty(factory);
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registerFunctionLength(factory);
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236
dbms/src/Functions/repeat.cpp
Normal file
236
dbms/src/Functions/repeat.cpp
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@ -0,0 +1,236 @@
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#include <Columns/ColumnFixedString.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnVector.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/IFunction.h>
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#include <Functions/castTypeToEither.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 ILLEGAL_COLUMN;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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struct RepeatImpl
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{
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static void vectorNonConstStr(
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const ColumnString::Chars & data,
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const ColumnString::Offsets & offsets,
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ColumnString::Chars & res_data,
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ColumnString::Offsets & res_offsets,
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const UInt64 repeatTime)
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{
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UInt64 data_size = 0;
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res_offsets.assign(offsets);
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for (UInt64 i = 0; i < offsets.size(); ++i)
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{
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data_size += (offsets[i] - offsets[i - 1] - 1) * repeatTime + 1;
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res_offsets[i] = data_size;
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}
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res_data.resize(data_size);
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for (UInt64 i = 0; i < res_offsets.size(); ++i)
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{
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array(data.data() + offsets[i - 1], res_data.data() + res_offsets[i - 1], offsets[i] - offsets[i - 1], repeatTime);
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}
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}
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static void
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vectorConst(const String & copy_str, const UInt64 repeatTime, ColumnString::Chars & res_data, ColumnString::Offsets & res_offsets)
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{
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UInt64 data_size = copy_str.size() * repeatTime + 1;
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res_data.resize(data_size);
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res_offsets.resize_fill(1, data_size);
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array((UInt8 *)copy_str.data(), res_data.data(), copy_str.size() + 1, repeatTime);
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}
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template <typename T>
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static void vectorNonConst(
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const ColumnString::Chars & data,
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const ColumnString::Offsets & offsets,
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ColumnString::Chars & res_data,
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ColumnString::Offsets & res_offsets,
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const PaddedPODArray<T> & col_num)
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{
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UInt64 data_size = 0;
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res_offsets.assign(offsets);
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for (UInt64 i = 0; i < col_num.size(); ++i)
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{
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data_size += (offsets[i] - offsets[i - 1] - 1) * col_num[i] + 1;
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res_offsets[i] = data_size;
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}
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res_data.resize(data_size);
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for (UInt64 i = 0; i < col_num.size(); ++i)
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{
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array(data.data() + offsets[i - 1], res_data.data() + res_offsets[i - 1], offsets[i] - offsets[i - 1], col_num[i]);
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}
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}
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template <typename T>
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static void vectorNonConstInteger(
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const String & copy_str, ColumnString::Chars & res_data, ColumnString::Offsets & res_offsets, const PaddedPODArray<T> & col_num)
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{
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UInt64 data_size = 0;
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res_offsets.resize(col_num.size());
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UInt64 str_size = copy_str.size();
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for (UInt64 i = 0; i < col_num.size(); ++i)
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{
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data_size += str_size * col_num[i] + 1;
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res_offsets[i] = data_size;
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}
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res_data.resize(data_size);
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for (UInt64 i = 0; i < col_num.size(); ++i)
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{
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array((UInt8 *)copy_str.data(), res_data.data() + res_offsets[i - 1], str_size + 1, col_num[i]);
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}
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}
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private:
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template <typename T>
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static void array(const UInt8 * src, UInt8 * dst, const UInt64 size, T repeatTime)
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{
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UInt64 i = 0;
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do
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{
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memcpy(dst, src, size - 1);
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dst += size - 1;
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++i;
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} while (i < repeatTime);
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*dst = 0;
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}
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};
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template <typename Impl>
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class FunctionRepeatImpl : public IFunction
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{
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template <typename F>
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static bool castType(const IDataType * type, F && f)
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{
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return castTypeToEither<
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DataTypeUInt8,
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DataTypeUInt16,
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DataTypeUInt32,
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DataTypeUInt64>(type, std::forward<F>(f));
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}
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public:
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static constexpr auto name = "repeat";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionRepeatImpl>(); }
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String getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 2; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (!isString(arguments[0]))
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throw Exception(
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"Illegal type " + arguments[0]->getName() + " of argument of function " + getName(),
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!isUnsignedInteger(arguments[1]))
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throw Exception(
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"Illegal type " + arguments[1]->getName() + " of argument of function 1" + getName(),
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return arguments[0];
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t) override
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{
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const ColumnPtr strcolumn = block.getByPosition(arguments[0]).column;
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const ColumnPtr numcolumn = block.getByPosition(arguments[1]).column;
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if (const ColumnString * col = checkAndGetColumn<ColumnString>(strcolumn.get()))
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{
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if (const ColumnConst * scale_column_num = checkAndGetColumn<ColumnConst>(numcolumn.get()))
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{
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Field scale_field_num = scale_column_num->getField();
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UInt64 repeat_time = scale_field_num.get<UInt64>();
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auto col_res = ColumnString::create();
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Impl::vectorNonConstStr(
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col->getChars(), col->getOffsets(), col_res->getChars(), col_res->getOffsets(), repeat_time);
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block.getByPosition(result).column = std::move(col_res);
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}
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else if (!castType(
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block.getByPosition(arguments[1]).type.get(), [&](const auto & type) {
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using DataType = std::decay_t<decltype(type)>;
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using T0 = typename DataType::FieldType;
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const ColumnVector<T0> * colnum = checkAndGetColumn<ColumnVector<T0>>(numcolumn.get());
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if (col->size() > 1 && colnum->size() > 1 && col->size() != colnum->size())
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throw Exception(
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"Column size doesn't match of argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN);
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auto col_res = ColumnString::create();
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if (colnum->size() == 1 && col->size() >= 1)
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{
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UInt64 repeat_time = colnum->get64(0);
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Impl::vectorNonConstStr(
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col->getChars(), col->getOffsets(), col_res->getChars(), col_res->getOffsets(), repeat_time);
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}
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else
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{
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Impl::vectorNonConst(
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col->getChars(),
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col->getOffsets(),
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col_res->getChars(),
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col_res->getOffsets(),
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colnum->getData());
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}
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block.getByPosition(result).column = std::move(col_res);
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return 0;
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}))
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;
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else
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throw Exception(
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"Illegal column " + block.getByPosition(arguments[1]).column->getName() + " of argument of function2 "
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+ getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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else if (const ColumnConst * scale_column_str = checkAndGetColumn<ColumnConst>(strcolumn.get()))
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{
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Field scale_field_str = scale_column_str->getField();
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String copy_str = scale_field_str.get<String>();
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if (const ColumnConst * scale_column_num = checkAndGetColumn<ColumnConst>(numcolumn.get()))
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{
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Field scale_field_num = scale_column_num->getField();
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UInt64 repeat_time = scale_field_num.get<UInt64>();
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auto col_res = ColumnString::create();
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Impl::vectorConst(copy_str, repeat_time, col_res->getChars(), col_res->getOffsets());
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block.getByPosition(result).column = std::move(col_res);
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}
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else if (!castType(block.getByPosition(arguments[1]).type.get(), [&](const auto & type) {
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using DataType = std::decay_t<decltype(type)>;
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using T0 = typename DataType::FieldType;
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const ColumnVector<T0> * colnum = checkAndGetColumn<ColumnVector<T0>>(numcolumn.get());
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auto col_res = ColumnString::create();
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Impl::vectorNonConstInteger(copy_str, col_res->getChars(), col_res->getOffsets(), colnum->getData());
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block.getByPosition(result).column = std::move(col_res);
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return 0;
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}))
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;
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else
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throw Exception(
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"Illegal column " + block.getByPosition(arguments[1]).column->getName() + " of argument of function2 "
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+ getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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else
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throw Exception(
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"Illegal column " + block.getByPosition(arguments[0]).column->getName() + " of argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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using FunctionRepeat = FunctionRepeatImpl<RepeatImpl>;
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void registerFunctionRepeat(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionRepeat>();
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}
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}
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