Pipe block operators proposal

Operators

• Excellent parallel
  • map
  • filter
• Good parallel
  • reduce (makes sure that size >= 1)
  • reduce0 (also takes zero element. Can accept zero-sized stream)
  • group_by (in fact it's reduce by google whitepaper)
• Bad parallel
  • sort
  • unique (alias disctinct)
• Shrinkable
  • skip
  • limit
  • any
  • all
• Debug
  • peek(dst)
  • print (==peek(stdout))

Frame operators

• Pack N frames into 1. Pack each block to make it operational over N-subblock-frame
• Unpack 1 frame into N. (in fact combos with pack-blocking)