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76 lines
2.4 KiB
C++
76 lines
2.4 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/DataTypeDateTime64.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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namespace
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{
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template <typename DataType>
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class FunctionEmptyArray : public IFunction
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{
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public:
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static String getNameImpl() { return "emptyArray" + DataType().getName(); }
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static FunctionPtr create(ContextPtr) { 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 getNameImpl();
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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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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
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{
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return ColumnArray::create(
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DataType().createColumn(),
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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 F>
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void registerFunction(FunctionFactory & factory)
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{
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factory.registerFunction<F>(F::getNameImpl());
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}
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}
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void registerFunctionsEmptyArray(FunctionFactory & factory)
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{
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registerFunction<FunctionEmptyArray<DataTypeUInt8>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeUInt16>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeUInt32>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeUInt64>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeInt8>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeInt16>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeInt32>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeInt64>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeFloat32>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeFloat64>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeDate>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeDateTime>>(factory);
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registerFunction<FunctionEmptyArray<DataTypeString>>(factory);
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}
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}
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