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SELECT a.cpe_id,
a.cpe23,
COALESCE(c.titles, '[]') AS titles,
COALESCE(d.refs, '[]') AS refs,
b.rank
FROM cpes a
JOIN (
-- limit to "best" match (e.g., lowest rank) for given CPE
-- NOTE: it's not clear to me whether cross-index bm25()
-- comparisons are valid
SELECT a.cpe_id,
MIN(a.rank) AS rank
FROM (
-- find title matches
SELECT b.cpe_id,
a.rank AS rank
FROM cpe_titles_fts a
JOIN cpe_titles b
ON (b.cpe_title_id = a.rowid)
WHERE cpe_titles_fts MATCH :q
UNION ALL
-- find reference matches
SELECT b.cpe_id,
a.rank
FROM cpe_refs_fts a
JOIN cpe_refs b
ON (b.cpe_ref_id = a.rowid)
WHERE cpe_refs_fts MATCH :q
) a
GROUP BY a.cpe_id
) b ON (b.cpe_id = a.cpe_id)
-- get all titles, grouped by cpe
LEFT JOIN (
SELECT cpe_id,
json_group_array(json_object(
'lang', lang,
'text', val
)) AS titles
FROM cpe_titles
GROUP BY cpe_id
) c ON (c.cpe_id = b.cpe_id)
-- get all refs, grouped by cpe
LEFT JOIN (
SELECT cpe_id,
json_group_array(json_object(
'href', href,
'text', val
)) AS refs
FROM cpe_refs
GROUP BY cpe_id
) d ON (d.cpe_id = b.cpe_id)
-- order by rank
ORDER BY b.rank
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