New article + minor reorg
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Yorhel
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16 changed files with 928 additions and 28 deletions
122
pub/download/code/vntitles3.sql
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122
pub/download/code/vntitles3.sql
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BEGIN;
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-- The original VIEW solution for comparison:
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CREATE OR REPLACE VIEW vnt AS
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SELECT v.*
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, COALESCE(ve.title, vo.latin, vo.title) AS title
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, CASE WHEN vo.latin IS NULL THEN '' ELSE vo.title END AS alttitle
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FROM vn v
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JOIN vn_titles vo ON vo.id = v.id AND vo.lang = v.olang
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LEFT JOIN vn_titles ve ON ve.id = v.id AND ve.lang = 'en';
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CREATE TABLE vnt_type (LIKE vn, title text, alttitle text);
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CREATE TYPE langprefs AS (
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-- NULL langs means unused slot
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t1_lang language,
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t2_lang language,
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t3_lang language,
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t4_lang language,
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a1_lang language,
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a2_lang language,
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a3_lang language,
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a4_lang language,
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-- These should never be NULL
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t1_latin boolean,
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t2_latin boolean,
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t3_latin boolean,
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t4_latin boolean,
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to_latin boolean, -- Original language fallback
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a1_latin boolean,
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a2_latin boolean,
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a3_latin boolean,
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a4_latin boolean,
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ao_latin boolean,
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-- These have three possible options:
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-- * NULL: Only if lang == original, i.e. skip this slot if it's not the original language
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-- * true: Only if official
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-- * false: Use this language regardless of official/original status
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t1_official boolean,
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t2_official boolean,
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t3_official boolean,
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t4_official boolean,
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a1_official boolean,
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a2_official boolean,
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a3_official boolean,
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a4_official boolean
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);
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CREATE OR REPLACE FUNCTION vnt(p langprefs) RETURNS SETOF vnt_type AS $$
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SELECT v.*
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-- The language selection logic below is specially written so that the planner can remove references to joined tables corresponding to NULL languages.
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, COALESCE(
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CASE WHEN p.t1_lang IS NULL OR (p.t1_official AND NOT t1.official) OR (p.t1_official IS NULL AND t1.lang <> v.olang) THEN NULL ELSE COALESCE(CASE WHEN p.t1_latin THEN t1.latin ELSE NULL END, t1.title) END,
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CASE WHEN p.t2_lang IS NULL OR (p.t2_official AND NOT t2.official) OR (p.t2_official IS NULL AND t2.lang <> v.olang) THEN NULL ELSE COALESCE(CASE WHEN p.t2_latin THEN t2.latin ELSE NULL END, t2.title) END,
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CASE WHEN p.t3_lang IS NULL OR (p.t3_official AND NOT t3.official) OR (p.t3_official IS NULL AND t3.lang <> v.olang) THEN NULL ELSE COALESCE(CASE WHEN p.t3_latin THEN t3.latin ELSE NULL END, t3.title) END,
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CASE WHEN p.t4_lang IS NULL OR (p.t4_official AND NOT t4.official) OR (p.t4_official IS NULL AND t4.lang <> v.olang) THEN NULL ELSE COALESCE(CASE WHEN p.t4_latin THEN t4.latin ELSE NULL END, t4.title) END,
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CASE WHEN p IS NULL OR p.to_latin THEN ol.latin ELSE NULL END, ol.title
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) AS title
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, COALESCE(
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CASE WHEN p.a1_lang IS NULL OR (p.a1_official AND NOT a1.official) OR (p.a1_official IS NULL AND a1.lang <> v.olang) THEN NULL ELSE COALESCE(CASE WHEN p.a1_latin THEN a1.latin ELSE NULL END, a1.title) END,
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CASE WHEN p.a2_lang IS NULL OR (p.a2_official AND NOT a2.official) OR (p.a2_official IS NULL AND a2.lang <> v.olang) THEN NULL ELSE COALESCE(CASE WHEN p.a2_latin THEN a2.latin ELSE NULL END, a2.title) END,
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CASE WHEN p.a3_lang IS NULL OR (p.a3_official AND NOT a3.official) OR (p.a3_official IS NULL AND a3.lang <> v.olang) THEN NULL ELSE COALESCE(CASE WHEN p.a3_latin THEN a3.latin ELSE NULL END, a3.title) END,
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CASE WHEN p.a4_lang IS NULL OR (p.a4_official AND NOT a4.official) OR (p.a4_official IS NULL AND a4.lang <> v.olang) THEN NULL ELSE COALESCE(CASE WHEN p.a4_latin THEN a4.latin ELSE NULL END, a4.title) END,
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CASE WHEN p.ao_latin THEN ol.latin ELSE NULL END, ol.title
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) AS alttitle
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FROM vn v
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JOIN vn_titles ol ON ol.id = v.id AND ol.lang = v.olang
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-- The COALESCE() below is kind of meaningless, but apparently the query planner can't optimize out JOINs with NULL conditions.
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LEFT JOIN vn_titles t1 ON t1.id = v.id AND t1.lang = COALESCE(p.t1_lang, 'en')
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LEFT JOIN vn_titles t2 ON t2.id = v.id AND t2.lang = COALESCE(p.t2_lang, 'en')
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LEFT JOIN vn_titles t3 ON t3.id = v.id AND t3.lang = COALESCE(p.t3_lang, 'en')
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LEFT JOIN vn_titles t4 ON t4.id = v.id AND t4.lang = COALESCE(p.t4_lang, 'en')
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LEFT JOIN vn_titles a1 ON a1.id = v.id AND a1.lang = COALESCE(p.a1_lang, 'en')
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LEFT JOIN vn_titles a2 ON a2.id = v.id AND a2.lang = COALESCE(p.a2_lang, 'en')
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LEFT JOIN vn_titles a3 ON a3.id = v.id AND a3.lang = COALESCE(p.a3_lang, 'en')
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LEFT JOIN vn_titles a4 ON a4.id = v.id AND a4.lang = COALESCE(p.a4_lang, 'en')
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$$ LANGUAGE SQL STABLE;
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SET max_parallel_workers_per_gather = 0;
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EXPLAIN ANALYZE
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SELECT id, title, alttitle
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FROM vnt('(en,,,,,,,,f,f,f,f,t,f,f,f,f,f,,,,,f,f,f,f)'::langprefs) x
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-- FROM vnt(NULL) x
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WHERE NOT hidden --AND x.id < 'v10'
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ORDER BY title LIMIT 100;
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EXPLAIN ANALYZE
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SELECT id, title, alttitle
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FROM vnt('(en,,,,,,,,f,f,f,f,t,f,f,f,f,f,,,,,f,f,f,f)'::langprefs) x
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-- FROM vnt(NULL) x
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WHERE NOT hidden --AND x.id < 'v10'
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ORDER BY title LIMIT 100;
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EXPLAIN ANALYZE
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SELECT id, title, alttitle
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-- FROM vnt('(en,,,,,,,,f,f,f,f,t,f,f,f,f,f,,,,,f,f,f,f)'::langprefs) x
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FROM vnt x
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WHERE NOT hidden --AND x.id < 'v10'
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ORDER BY title LIMIT 100;
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EXPLAIN ANALYZE
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SELECT id, title, alttitle
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-- FROM vnt('(en,,,,,,,,f,f,f,f,t,f,f,f,f,f,,,,,f,f,f,f)'::langprefs) x
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FROM vnt x
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WHERE NOT hidden --AND x.id < 'v10'
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ORDER BY title LIMIT 100;
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EXPLAIN ANALYZE
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SELECT i.id, i.width, i.height, i.id AS vid, v.title
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FROM (SELECT id, width, height FROM images i TABLESAMPLE SYSTEM (0.93)
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WHERE i.c_weight > 0
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AND vndbid_type(i.id) = 'sf'
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AND i.c_sexual_avg < 40
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AND i.c_violence_avg < 40
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ORDER BY random()
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LIMIT 4) i(id)
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JOIN vn_screenshots vs ON vs.scr = i.id
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JOIN vnt('(en,,,,,,,,f,f,f,f,t,f,f,f,f,f,,,,,f,f,f,f)'::langprefs) v ON v.id = vs.id
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WHERE NOT v.hidden
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ORDER BY random() LIMIT '4';
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