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f21f2f7d76
The max(id) self-join let the query planner pick a nested-loop plan when it misjudged a season's row count (e.g. a freshly started season whose stats are dwarfed by older seasons), making the query take ~12s on the current season. The window-function form references Skill once and is plan-stable regardless of stats. Output is identical.
29 lines
964 B
TypeScript
29 lines
964 B
TypeScript
import { sql } from "~/db/sql";
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import type { Tables } from "~/db/tables";
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// Window function (latest Skill row per user) rather than a self-join against a
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// `max(id)` subquery: the self-join lets the planner pick a nested-loop plan when
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// it misjudges the season's row count (e.g. a freshly started season whose stats
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// are dwarfed by older seasons), which made this query take ~12s. This form is
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// plan-stable regardless of stats.
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const userStm = sql.prepare(/* sql */ `
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select "ordinal", "matchesCount", "userId"
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from (
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select
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"ordinal",
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"matchesCount",
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"userId",
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row_number() over (partition by "userId" order by "id" desc) as "rn"
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from "Skill"
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where "season" = @season and "userId" is not null
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)
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where "rn" = 1
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order by "ordinal" desc
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`);
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export function orderedUserMMRBySeason(season: number) {
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return userStm.all({ season }) as Array<
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Pick<Tables["Skill"], "ordinal" | "matchesCount" | "userId">
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>;
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}
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