58 lines
2.5 KiB
MySQL
58 lines
2.5 KiB
MySQL
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-- our last attempt was slow because nearly every row had to change given
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-- that we store the score and all other columns rather than the rank ...
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-- the score always changes and other columns are denormalized (and also change) ..
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-- if instead we just store the rank, concurrent refreshes should be faster
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-- as they'll be near identical
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-- we also limit the view to 2100 rows which is more than any reasonable person would view
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DROP MATERIALIZED VIEW IF EXISTS sat_rank_wwm_view;
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CREATE MATERIALIZED VIEW IF NOT EXISTS sat_rank_wwm_view AS
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SELECT id, row_number() OVER (ORDER BY
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((GREATEST("weightedVotes", POWER("weightedVotes", 1.2)) + "weightedComments"/2)
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/
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POWER(GREATEST(3, EXTRACT(EPOCH FROM (now_utc() - created_at))/3600), 1.3)
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+
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(boost/5000::float)
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/
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POWER(EXTRACT(EPOCH FROM (now_utc() - created_at))/3600+2, 2.6)) DESC NULLS LAST, id DESC) as rank
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FROM "Item"
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WHERE "parentId" IS NULL AND NOT bio AND "pinId" IS NULL AND "deletedAt" IS NULL
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AND "weightedVotes" > 0
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ORDER BY
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((GREATEST("weightedVotes", POWER("weightedVotes", 1.2)) + "weightedComments"/2)
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/
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POWER(GREATEST(3, EXTRACT(EPOCH FROM (now_utc() - created_at))/3600), 1.3)
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+
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(boost/5000::float)
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/
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POWER(EXTRACT(EPOCH FROM (now_utc() - created_at))/3600+2, 2.6)) DESC NULLS LAST, id DESC
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LIMIT 2100;
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CREATE UNIQUE INDEX IF NOT EXISTS sat_rank_wwm_view_idx ON sat_rank_wwm_view(rank ASC);
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-- we do the same for the tender view
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DROP MATERIALIZED VIEW IF EXISTS sat_rank_tender_view;
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CREATE MATERIALIZED VIEW IF NOT EXISTS sat_rank_tender_view AS
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SELECT id, row_number() OVER (ORDER BY
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((GREATEST(ABS("weightedVotes" - "weightedDownVotes"), POWER(ABS("weightedVotes" - "weightedDownVotes"), 1.2))
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+ "weightedComments"/2)
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/
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POWER(GREATEST(3, EXTRACT(EPOCH FROM (now_utc() - created_at))/3600), 1.3)
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+
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(boost/5000::float)
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/
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POWER(EXTRACT(EPOCH FROM (now_utc() - created_at))/3600+2, 2.6)) DESC NULLS LAST, id DESC) AS rank
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FROM "Item"
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WHERE "parentId" IS NULL AND NOT bio AND "pinId" IS NULL AND "deletedAt" IS NULL
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AND "weightedVotes" > "weightedDownVotes"
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ORDER BY
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((GREATEST(ABS("weightedVotes" - "weightedDownVotes"), POWER(ABS("weightedVotes" - "weightedDownVotes"), 1.2))
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+ "weightedComments"/2)
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/
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POWER(GREATEST(3, EXTRACT(EPOCH FROM (now_utc() - created_at))/3600), 1.3)
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+
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(boost/5000::float)
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/
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POWER(EXTRACT(EPOCH FROM (now_utc() - created_at))/3600+2, 2.6)) DESC NULLS LAST, id DESC
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LIMIT 2100;
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CREATE UNIQUE INDEX IF NOT EXISTS sat_rank_tender_view_idx ON sat_rank_tender_view(rank ASC);
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