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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
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
#include <Functions/IFunction.h>
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#include <Functions/FunctionFactory.h>
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#include <DataTypes/DataTypeLowCardinality.h>
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#include <Columns/ColumnLowCardinality.h>
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#include <Common/typeid_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 ILLEGAL_TYPE_OF_ARGUMENT;
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}
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namespace
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{
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class FunctionLowCardinalityKeys: public IFunction
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{
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public:
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static constexpr auto name = "lowCardinalityKeys";
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static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionLowCardinalityKeys>(); }
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String getName() const override { return name; }
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size_t getNumberOfArguments() const override { return 1; }
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bool useDefaultImplementationForNulls() const override { return false; }
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bool useDefaultImplementationForConstants() const override { return true; }
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bool useDefaultImplementationForLowCardinalityColumns() const override { return false; }
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bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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const auto * type = typeid_cast<const DataTypeLowCardinality *>(arguments[0].get());
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if (!type)
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throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
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"First first argument of function lowCardinalityKeys must be ColumnLowCardinality, "
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"but got {}", arguments[0]->getName());
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return type->getDictionaryType();
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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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const auto & arg = arguments[0];
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const auto * low_cardinality_column = typeid_cast<const ColumnLowCardinality *>(arg.column.get());
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return low_cardinality_column->getDictionary().getNestedColumn()->cloneResized(arg.column->size());
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}
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};
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}
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REGISTER_FUNCTION(LowCardinalityKeys)
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{
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factory.registerFunction<FunctionLowCardinalityKeys>();
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}
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}
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