Enhancement

Support spill to disk for memory intensive operator like join/aggregation/sort/topN/window.

Pre-work

• Make max_block_size work for all InputStreams The block returned by InputStream should obey the max_block_size constraint #3436

Sub-tasks

• Framework
  • Memory tracker for MPP task/query/query group
  • Spill framework
• Spill algorithm for memory intensive operators
  • Sort/TopN
  • (Hash)Aggregation
  • (Hash)Join
  • Window