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70d1adfe4b
* save format string for NetException * format exceptions * format exceptions 2 * format exceptions 3 * format exceptions 4 * format exceptions 5 * format exceptions 6 * fix * format exceptions 7 * format exceptions 8 * Update MergeTreeIndexGin.cpp * Update AggregateFunctionMap.cpp * Update AggregateFunctionMap.cpp * fix
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeString.h>
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#include <IO/WriteHelpers.h>
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#include <Functions/FunctionFactory.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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class FunctionMonthName : public IFunction
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{
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public:
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static constexpr auto name = "monthName";
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static constexpr auto month_str = "month";
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static FunctionPtr create(ContextPtr context) { return std::make_shared<FunctionMonthName>(context); }
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explicit FunctionMonthName(ContextPtr context_)
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: function_resolver(FunctionFactory::instance().get("dateName", std::move(context_)))
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{}
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String getName() const override { return name; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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size_t getNumberOfArguments() const override { return 1; }
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DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
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{
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if (arguments.size() != 1)
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throw Exception(
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
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"Number of arguments for function {} doesn't match: passed {}, should be 1",
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getName(),
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arguments.size());
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WhichDataType argument_type(arguments[0].type);
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if (!argument_type.isDate() && !argument_type.isDateTime() && !argument_type.isDateTime64())
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throw Exception(
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"Illegal type of argument of function {}, should be Date, DateTime or DateTime64",
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getName());
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return std::make_shared<DataTypeString>();
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}
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ColumnPtr executeImpl(
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const ColumnsWithTypeAndName & arguments,
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const DataTypePtr & result_type,
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size_t input_rows_count) const override
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{
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auto month_column = DataTypeString().createColumnConst(arguments[0].column->size(), month_str);
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ColumnsWithTypeAndName temporary_columns
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{
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ColumnWithTypeAndName(month_column, std::make_shared<DataTypeString>(), ""),
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arguments[0]
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};
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auto date_name_func = function_resolver->build(temporary_columns);
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return date_name_func->execute(temporary_columns, result_type, input_rows_count);
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}
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private:
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FunctionOverloadResolverPtr function_resolver;
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};
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REGISTER_FUNCTION(MonthName)
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{
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factory.registerFunction<FunctionMonthName>({}, FunctionFactory::CaseInsensitive);
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}
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}
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