code: func NewBindHandle(ctx sessionctx.Context) *BindHandle {
  	handle := &BindHandle{}
  	handle.sctx.Context = ctx
  	handle.bindInfo.Value.Store(make(cache, 32))
  	handle.bindInfo.parser = parser.New()
  	handle.invalidBindRecordMap.Value.Store(make(map[string]*invalidBindRecordMap))
  	return handle
  }
docs: // NewBindHandle creates a new BindHandle.