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0c55ac76d2
Enable: - bugprone-lambda-function-name: "Checks for attempts to get the name of a function from within a lambda expression. The name of a lambda is always something like operator(), which is almost never what was intended." - bugprone-unhandled-self-assignment: "Finds user-defined copy assignment operators which do not protect the code against self-assignment either by checking self-assignment explicitly or using the copy-and-swap or the copy-and-move method."" - hicpp-invalid-access-moved: "Warns if an object is used after it has been moved." - hicpp-use-noexcept: "This check replaces deprecated dynamic exception specifications with the appropriate noexcept specification (introduced in C++11)" - hicpp-use-override: "Adds override (introduced in C++11) to overridden virtual functions and removes virtual from those functions as it is not required." - performance-type-promotion-in-math-fn: "Finds calls to C math library functions (from math.h or, in C++, cmath) with implicit float to double promotions." Split up: - cppcoreguidelines-*. Some of them may be useful (haven't checked in detail), therefore allow to toggle them individually. Disable: - linuxkernel-*. Obvious.
72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
#include <memory>
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#include <Columns/ColumnString.h>
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#include <Core/Block.h>
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#include <DataTypes/DataTypeString.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/IFunction.h>
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#include <Storages/MergeTree/MergeTreePartition.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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}
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/** partitionId(x, y, ...) is a function that computes partition ids of arguments.
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* The function is slow and should not be called for large amount of rows.
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*/
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class FunctionPartitionId : public IFunction
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{
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public:
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static constexpr auto name = "partitionId";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionPartitionId>(); }
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String getName() const override { return name; }
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bool isVariadic() const override { return true; }
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size_t getNumberOfArguments() const override { return 0; }
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bool isInjective(const ColumnsWithTypeAndName & /*sample_columns*/) const override { return true; }
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bool useDefaultImplementationForNulls() const override { return true; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (arguments.empty())
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throw Exception("Function " + getName() + " requires at least one argument.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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return std::make_shared<DataTypeString>();
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}
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ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
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{
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Block sample_block(arguments);
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size_t size = arguments.size();
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auto result_column = ColumnString::create();
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for (size_t j = 0; j < input_rows_count; ++j)
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{
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Row row(size);
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for (size_t i = 0; i < size; ++i)
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arguments[i].column->get(j, row[i]);
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MergeTreePartition partition(std::move(row));
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result_column->insert(partition.getID(sample_block));
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}
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return result_column;
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}
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};
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void registerFunctionPartitionId(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionPartitionId>();
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}
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}
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