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#include <Functions/IFunction.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/FunctionFactory.h>
#include <DataTypes/DataTypeArray.h>
#include <Interpreters/ArrayJoinAction.h>
namespace DB
{
namespace ErrorCodes
{
extern const int FUNCTION_IS_SPECIAL;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
/** arrayJoin(arr) - a special function - it can not be executed directly;
* is used only to get the result type of the corresponding expression.
*/
class FunctionArrayJoin : public IFunction
{
public:
static constexpr auto name = "arrayJoin";
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionArrayJoin>();
}
/// Get the function name.
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override
{
return 1;
}
/** It could return many different values for single argument. */
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
{
const auto & arr = getArrayJoinDataType(arguments[0]);
if (!arr)
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "Argument for function {} must be Array or Map", getName());
return arr->getNestedType();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t /*input_rows_count*/) const override
{
throw Exception(ErrorCodes::FUNCTION_IS_SPECIAL, "Function {} must not be executed directly.", getName());
}
/// Because of function cannot be executed directly.
bool isSuitableForConstantFolding() const override
{
return false;
}
};
REGISTER_FUNCTION(ArrayJoin)
{
factory.registerFunction<FunctionArrayJoin>();
}
}
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