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#include <Functions/IFunction.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/FunctionFactory.h>
#include <DataTypes/DataTypesNumber.h>
#include <Core/ColumnNumbers.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnLowCardinality.h>
#include <Common/assert_cast.h>
namespace DB
{
namespace
{
/// Implements the function isNotNull which returns true if a value
/// is not null, false otherwise.
class FunctionIsNotNull : public IFunction
{
public:
static constexpr auto name = "isNotNull";
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionIsNotNull>();
}
std::string getName() const override
{
return name;
}
size_t getNumberOfArguments() const override { return 1; }
bool useDefaultImplementationForNulls() const override { return false; }
bool useDefaultImplementationForConstants() const override { return true; }
bool useDefaultImplementationForLowCardinalityColumns() const override { return false; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
ColumnNumbers getArgumentsThatDontImplyNullableReturnType(size_t /*number_of_arguments*/) const override { return {0}; }
DataTypePtr getReturnTypeImpl(const DataTypes &) const override
{
return std::make_shared<DataTypeUInt8>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr &, size_t input_rows_count) const override
{
const ColumnWithTypeAndName & elem = arguments[0];
if (elem.type->isLowCardinalityNullable())
{
const auto * low_cardinality_column = checkAndGetColumn<ColumnLowCardinality>(*elem.column);
const size_t null_index = low_cardinality_column->getDictionary().getNullValueIndex();
auto res = DataTypeUInt8().createColumn();
auto & data = typeid_cast<ColumnUInt8 &>(*res).getData();
data.reserve(low_cardinality_column->size());
for (size_t i = 0; i != low_cardinality_column->size(); ++i)
data.push_back(low_cardinality_column->getIndexAt(i) != null_index);
return res;
}
if (const auto * nullable = checkAndGetColumn<ColumnNullable>(*elem.column))
{
/// Return the negated null map.
auto res_column = ColumnUInt8::create(input_rows_count);
const auto & src_data = nullable->getNullMapData();
auto & res_data = assert_cast<ColumnUInt8 &>(*res_column).getData();
for (size_t i = 0; i < input_rows_count; ++i)
res_data[i] = !src_data[i];
return res_column;
}
else
{
/// Since no element is nullable, return a constant one.
return DataTypeUInt8().createColumnConst(elem.column->size(), 1u);
}
}
};
}
REGISTER_FUNCTION(IsNotNull)
{
factory.registerFunction<FunctionIsNotNull>();
}
}
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