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#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Functions/extractTimeZoneFromFunctionArguments.h>
#include <DataTypes/DataTypeDateTime.h>
#include <Columns/ColumnsDateTime.h>
#include <Columns/ColumnVector.h>
#include <Interpreters/Context.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
namespace
{
/** Returns current time at calculation of every block.
* In contrast to 'now' function, it's not a constant expression and is not a subject of constant folding.
*/
class FunctionNowInBlock : public IFunction
{
public:
static constexpr auto name = "nowInBlock";
static FunctionPtr create(ContextPtr context)
{
return std::make_shared<FunctionNowInBlock>(context);
}
explicit FunctionNowInBlock(ContextPtr context)
: allow_nonconst_timezone_arguments(context->getSettings().allow_nonconst_timezone_arguments)
{}
String getName() const override
{
return name;
}
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override
{
return false;
}
/// Optional timezone argument.
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool isDeterministic() const override
{
return false;
}
bool isDeterministicInScopeOfQuery() const override
{
return false;
}
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
if (arguments.size() > 1)
{
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Arguments size of function {} should be 0 or 1", getName());
}
if (arguments.size() == 1 && !isStringOrFixedString(arguments[0].type))
{
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Arguments of function {} should be String or FixedString",
getName());
}
if (arguments.size() == 1)
{
return std::make_shared<DataTypeDateTime>(extractTimeZoneNameFromFunctionArguments(arguments, 0, 0, allow_nonconst_timezone_arguments));
}
return std::make_shared<DataTypeDateTime>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
{
return ColumnDateTime::create(input_rows_count, static_cast<UInt32>(time(nullptr)));
}
private:
const bool allow_nonconst_timezone_arguments;
};
}
REGISTER_FUNCTION(NowInBlock)
{
factory.registerFunction<FunctionNowInBlock>();
}
}
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