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58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
#include <AggregateFunctions/AggregateFunctionHistogram.h>
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#include <AggregateFunctions/AggregateFunctionFactory.h>
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#include <AggregateFunctions/FactoryHelpers.h>
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#include <AggregateFunctions/Helpers.h>
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#include <Common/FieldVisitors.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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extern const int BAD_ARGUMENTS;
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extern const int UNSUPPORTED_PARAMETER;
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extern const int PARAMETER_OUT_OF_BOUND;
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}
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namespace
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{
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AggregateFunctionPtr createAggregateFunctionHistogram(const std::string & name, const DataTypes & arguments, const Array & params)
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{
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if (params.size() != 1)
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throw Exception("Function " + name + " requires single parameter: bins count", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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if (params[0].getType() != Field::Types::UInt64)
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throw Exception("Invalid type for bins count", ErrorCodes::UNSUPPORTED_PARAMETER);
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UInt32 bins_count = applyVisitor(FieldVisitorConvertToNumber<UInt32>(), params[0]);
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auto limit = AggregateFunctionHistogramData::bins_count_limit;
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if (bins_count > limit)
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throw Exception("Unsupported bins count. Should not be greater than " + std::to_string(limit), ErrorCodes::PARAMETER_OUT_OF_BOUND);
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if (bins_count == 0)
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throw Exception("Bin count should be positive", ErrorCodes::BAD_ARGUMENTS);
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assertUnary(name, arguments);
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AggregateFunctionPtr res(createWithNumericType<AggregateFunctionHistogram>(*arguments[0], bins_count, arguments, params));
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if (!res)
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throw Exception("Illegal type " + arguments[0]->getName() + " of argument for aggregate function " + name, ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return res;
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}
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}
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void registerAggregateFunctionHistogram(AggregateFunctionFactory & factory)
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{
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factory.registerFunction("histogram", createAggregateFunctionHistogram);
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}
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}
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