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37 lines
925 B
C++
37 lines
925 B
C++
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#include "AggregateFunctionHistogram.h"
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#include "AggregateFunctionFactory.h"
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#include "FactoryHelpers.h"
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#include "Helpers.h"
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#include <Common/FieldVisitors.h>
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namespace DB {
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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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{
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throw Exception("Function " + name + " requires only bins count");
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}
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assertUnary(name, arguments);
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UInt32 bins_count;
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#define READ(VAL, PARAM) \
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VAL = applyVisitor(FieldVisitorConvertToNumber<decltype(VAL)>(), PARAM);
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READ(bins_count, params[0]);
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#undef READ
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AggregateFunctionPtr res(createWithNumericType<AggregateFunctionHistogram>(*arguments[0], bins_count));
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return res;
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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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