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#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <Interpreters/Context.h>
#include <DataTypes/DataTypeString.h>
#include <Core/Field.h>
namespace DB
{
class FunctionQueryID : public IFunction
{
const String query_id;
public:
static constexpr auto name = "queryID";
static FunctionPtr create(ContextPtr context)
{
return std::make_shared<FunctionQueryID>(context->getClientInfo().current_query_id);
}
explicit FunctionQueryID(const String & query_id_) : query_id(query_id_) {}
inline String getName() const override { return name; }
inline size_t getNumberOfArguments() const override { return 0; }
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
{
return std::make_shared<DataTypeString>();
}
inline bool isDeterministic() const override { return false; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
{
return DataTypeString().createColumnConst(input_rows_count, query_id)->convertToFullColumnIfConst();
}
};
REGISTER_FUNCTION(QueryID)
{
factory.registerFunction<FunctionQueryID>();
factory.registerAlias("query_id", FunctionQueryID::name, FunctionFactory::CaseInsensitive);
}
}
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