2018-09-26 00:31:40 +00:00
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#include <DataTypes/DataTypeDateTime.h>
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#include <Functions/IFunction.h>
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#include <Functions/FunctionFactory.h>
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namespace DB
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2019-09-30 14:59:04 +00:00
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{
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2018-09-26 00:31:40 +00:00
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/// Get the current time. (It is a constant, it is evaluated once for the entire query.)
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2019-09-30 14:59:04 +00:00
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class PreparedFunctionNow : public PreparedFunctionImpl
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2018-09-26 00:31:40 +00:00
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{
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public:
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2019-09-30 14:59:04 +00:00
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explicit PreparedFunctionNow(time_t time_) : time_value(time_) {}
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String getName() const override { return "now"; }
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protected:
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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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block.getByPosition(result).column = DataTypeDateTime().createColumnConst(
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input_rows_count,
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static_cast<UInt64>(time_value));
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}
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private:
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time_t time_value;
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};
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2018-09-26 00:31:40 +00:00
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2019-09-30 14:59:04 +00:00
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class FunctionBaseNow : public IFunctionBase
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{
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explicit FunctionBaseNow(time_t time_) : time_value(time_), return_type(std::make_shared<DataTypeDateTime>()) {}
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String getName() const override { return "now"; }
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const DataTypes & getArgumentTypes() const override
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2018-09-26 00:31:40 +00:00
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{
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2019-09-30 14:59:04 +00:00
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static const DataTypes argument_types;
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return argument_types;
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2018-09-26 00:31:40 +00:00
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}
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2019-09-30 14:59:04 +00:00
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const DataTypePtr & getReturnType() const override
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{
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return return_type;
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}
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2018-09-26 00:31:40 +00:00
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2019-09-30 14:59:04 +00:00
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PreparedFunctionPtr prepare(const Block &, const ColumnNumbers &, size_t) const override
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2018-09-26 00:31:40 +00:00
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{
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2019-09-30 14:59:04 +00:00
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return std::make_shared<PreparedFunctionNow>(time_value);
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2018-09-26 00:31:40 +00:00
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}
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bool isDeterministic() const override { return false; }
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2019-09-30 14:59:04 +00:00
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private:
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time_t time_value;
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DataTypePtr return_type;
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};
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class FunctionBuilderNow : public FunctionBuilderImpl
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{
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protected:
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DataTypePtr getReturnTypeImpl(const DataTypes &) const override { return std::make_shared<DataTypeDateTime>(); }
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FunctionBasePtr buildImpl(const ColumnsWithTypeAndName &, const DataTypePtr &) const override
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2018-09-26 00:31:40 +00:00
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{
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2019-09-30 14:59:04 +00:00
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return std::make_shared<FunctionBaseNow>(time(nullptr));
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2018-09-26 00:31:40 +00:00
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}
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};
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void registerFunctionNow(FunctionFactory & factory)
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{
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2019-09-30 14:59:04 +00:00
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factory.registerFunction<FunctionBuilderNow>(FunctionFactory::CaseInsensitive);
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2018-09-26 00:31:40 +00:00
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}
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}
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