A few PG hacks from Alibaba (thx to @olegkovalov)
1) PostgreSQL Graph Search Practices - 10 Billion-Scale Graph with Millisecond Response
https://www.alibabacloud.com/blog/postgresql-graph-search-practices---10-billion-scale-graph-with-millisecond-response_595039
2) Social Friend Relationship System Practice in PostgreSQL - Accelerating Queries of Positive and Negative Relationships
https://www.alibabacloud.com/blog/595043
Post #1079
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