Dingo Expression Coprocessor

This project is the coprocessor part of Dingo Expression, written in C++. The project is made standalone to be easily integrated into other C++ projects.

Getting Started

#include "runner.h"

using namespace dingodb::expr;

Assume bytes is an array of type Byte, which contains the encoded expression

Runner runner;
runner.Decode(bytes, sizeof(bytes)/sizeof(Byte));
runner.Run();
if (ruuner.GetType() == TYPE_INT32) {
  Wrap<int32_t> result = runner.GetResult<int32_t>();
}

Wrap is a type alias of std::optional, so the result may have or have not a value.

An raw result which contains any type can be retrieved by

Operand result = runner.GetRawResult();

Operand is a type alias of std::any, which means it can contain any type of data. Generally, it contains a value of Warp<T> type.

If the expression contains variables, a Tuple should be bind to the Runner before run

Tuple tuple{Wrap<int32_t>(1), Wrap<int32_t>(2)};
runner.BindTuple(&tuple, false);

where Tuple is a type alias of std::vector<Operand>.

The 2nd parameter of BindTuple indicate whether the Runner should take ownership of the pointer. If it set to true, the pointer would be released when the Runner is destructed.

Used by

• Dingo-Store