selectArticles:
SELECT articles.id, slug, title, description, body, users.username, users.bio, users.image, createdAt, updatedAt
     , COALESCE (array_agg (DISTINCT tag ORDER BY tag) FILTER (WHERE tag IS NOT NULL), '{}') AS articleTags
FROM articles
LEFT JOIN tags ON articles.id = tags.article_id
JOIN users ON articles.author_id = users.id
GROUP BY articles.id, users.id;

Compiling with dialect app.cash.sqldelight.dialects.postgresql.PostgreSqlDialect

/home/matobet/projects/kotlin/ktor-arrow-example/src/main/sqldelight/io/github/nomisrev/sqldelight/Articles.sq: (44, 41): '(', ')', '.', <binary like operator real>, <jsona binary operator real>, <jsonb binary operator real>, BETWEEN or IN expected, got 'ORDER'
43    SELECT articles.id, slug, title, description, body, users.username, users.bio, users.image, createdAt, updatedAt
44         , COALESCE (array_agg (DISTINCT tag ORDER BY tag) FILTER (WHERE tag IS NOT NULL), '{}') AS articleTags
                                               ^^^^^
45    FROM articles
46    LEFT JOIN tags ON articles.id = tags.article_id
47    JOIN users ON articles.author_id = users.id
48    GROUP BY articles.id, users.id