Does investment directly influence demand? I quote from the first page of India's Economic Survey 2019 (an official document) - 


  Investment, especially private investment, is the “key driver” that
  drives demand, creates capacity, increases labour productivity, introduces new
  technology, allows creative destruction, and generates jobs.


Does investment directly drive demand? If so, how? I can only see investment leading to higher productivity which increases supply and displaces jobs.If not, is the increase in demand a ripple effect of investment? If yes, what's the connection?
As mentioned by @Henry: investment is itself a demand for capital goods (physical, human, etc.).

If I decide to buy trucks this manifests itself as an increase in demand to the truck factory.