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71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypeDateTime64.h>
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#include <Functions/IFunctionImpl.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/extractTimeZoneFromFunctionArguments.h>
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#include <IO/WriteHelpers.h>
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#include <Common/assert_cast.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 NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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namespace
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{
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/// Just changes time zone information for data type. The calculation is free.
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class FunctionToTimeZone : public IFunction
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{
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public:
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static constexpr auto name = "toTimeZone";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionToTimeZone>(); }
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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 2; }
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (arguments.size() != 2)
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throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
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+ toString(arguments.size()) + ", should be 2",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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const auto which_type = WhichDataType(arguments[0].type);
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if (!which_type.isDateTime() && !which_type.isDateTime64())
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throw Exception{"Illegal type " + arguments[0].type->getName() + " of argument of function " + getName() +
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". Should be DateTime or DateTime64", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
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String time_zone_name = extractTimeZoneNameFromFunctionArguments(arguments, 1, 0);
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if (which_type.isDateTime())
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return std::make_shared<DataTypeDateTime>(time_zone_name);
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const auto * date_time64 = assert_cast<const DataTypeDateTime64 *>(arguments[0].type.get());
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return std::make_shared<DataTypeDateTime64>(date_time64->getScale(), time_zone_name);
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}
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ColumnPtr executeImpl(ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t /*input_rows_count*/) const override
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{
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return arguments[0].column;
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}
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};
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}
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void registerFunctionToTimeZone(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionToTimeZone>();
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}
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}
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