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#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesNumber.h>
#include <atomic>
namespace DB
{
namespace
{
/** Incremental number of row within all columns passed to this function. */
class FunctionRowNumberInAllBlocks : public IFunction
{
private:
mutable std::atomic<size_t> rows{0};
public:
static constexpr auto name = "rowNumberInAllBlocks";
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionRowNumberInAllBlocks>();
}
/// Get the name of the function.
String getName() const override
{
return name;
}
bool isStateful() const override
{
return true;
}
size_t getNumberOfArguments() const override
{
return 0;
}
bool isDeterministic() const override
{
return false;
}
bool isDeterministicInScopeOfQuery() const override
{
return false;
}
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
{
return std::make_shared<DataTypeUInt64>();
}
ColumnPtr executeImplDryRun(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
{
return ColumnUInt64::create(input_rows_count);
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
{
size_t current_row_number = rows.fetch_add(input_rows_count);
auto column = ColumnUInt64::create();
auto & data = column->getData();
data.resize(input_rows_count);
for (size_t i = 0; i < input_rows_count; ++i)
data[i] = current_row_number + i;
return column;
}
};
}
REGISTER_FUNCTION(RowNumberInAllBlocks)
{
factory.registerFunction<FunctionRowNumberInAllBlocks>();
}
}
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