** Changed in: tarantool
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1029816

Title:
  please add index by lua function

Status in Tarantool - an efficient in-memory data store:
  New

Bug description:
  Now taratnool builds index by field value.

  It would be nice to have indexes by lua function.

  example:

  function tlen(tuple)
    return #tuple
  end

  space[1].enabled = 1
  space[1].index[0].type = "TREE"
  space[1].index[0].unique = 0
  space[1].index[0].index_function.name = tlen
  space[1].index[0].index_function.type = NUM    # return value

  so tarantool should call 'tlen(tuple)' for each tuple while it is
  building index and while it is doing insert/update operation.

  so using the index (in example) we can find largest tuples

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