chore: simplify relationships.sql

Author: soedirgo

src/lib/sql/relationships.sql

@@ -1,44 +1,25 @@
 -- Adapted from
 -- https://github.com/PostgREST/postgrest/blob/f9f0f79fa914ac00c11fbf7f4c558e14821e67e2/src/PostgREST/SchemaCache.hs#L722
-WITH
-    pks_uniques_cols AS (
-      SELECT
-        connamespace,
-        conrelid,
-        jsonb_agg(column_info.cols) as cols
-      FROM pg_constraint
-      JOIN lateral (
-        SELECT array_agg(cols.attname order by cols.attnum) as cols
-        FROM ( select unnest(conkey) as col) _
-        JOIN pg_attribute cols on cols.attrelid = conrelid and cols.attnum = col
-      ) column_info ON TRUE
-      WHERE
-        contype IN ('p', 'u') and
-        connamespace::regnamespace::text <> 'pg_catalog'
-      GROUP BY connamespace, conrelid
-    )
-    SELECT
-      traint.oid AS id,
-      traint.conname AS foreign_key_name,
-      ns1.nspname AS schema,
-      tab.relname AS relation,
-      column_info.cols AS columns,
-      ns2.nspname AS referenced_schema,
-      other.relname AS referenced_relation,
-      column_info.refs AS referenced_columns
-    FROM pg_constraint traint
-    JOIN LATERAL (
-      SELECT
-        array_agg(row(cols.attname, refs.attname) order by ord) AS cols_and_fcols,
-        jsonb_agg(cols.attname order by ord) AS cols,
-        jsonb_agg(refs.attname order by ord) AS refs
-      FROM unnest(traint.conkey, traint.confkey) WITH ORDINALITY AS _(col, ref, ord)
-      JOIN pg_attribute cols ON cols.attrelid = traint.conrelid AND cols.attnum = col
-      JOIN pg_attribute refs ON refs.attrelid = traint.confrelid AND refs.attnum = ref
-    ) AS column_info ON TRUE
-    JOIN pg_namespace ns1 ON ns1.oid = traint.connamespace
-    JOIN pg_class tab ON tab.oid = traint.conrelid
-    JOIN pg_class other ON other.oid = traint.confrelid
-    JOIN pg_namespace ns2 ON ns2.oid = other.relnamespace
-    LEFT JOIN pks_uniques_cols pks_uqs ON pks_uqs.connamespace = traint.connamespace AND pks_uqs.conrelid = traint.conrelid
-    WHERE traint.contype = 'f'
+SELECT
+  traint.oid AS id,
+  traint.conname AS foreign_key_name,
+  ns1.nspname AS schema,
+  tab.relname AS relation,
+  column_info.cols AS columns,
+  ns2.nspname AS referenced_schema,
+  other.relname AS referenced_relation,
+  column_info.refs AS referenced_columns
+FROM pg_constraint traint
+JOIN LATERAL (
+  SELECT
+    jsonb_agg(cols.attname order by ord) AS cols,
+    jsonb_agg(refs.attname order by ord) AS refs
+  FROM unnest(traint.conkey, traint.confkey) WITH ORDINALITY AS _(col, ref, ord)
+  JOIN pg_attribute cols ON cols.attrelid = traint.conrelid AND cols.attnum = col
+  JOIN pg_attribute refs ON refs.attrelid = traint.confrelid AND refs.attnum = ref
+) AS column_info ON TRUE
+JOIN pg_namespace ns1 ON ns1.oid = traint.connamespace
+JOIN pg_class tab ON tab.oid = traint.conrelid
+JOIN pg_class other ON other.oid = traint.confrelid
+JOIN pg_namespace ns2 ON ns2.oid = other.relnamespace
+WHERE traint.contype = 'f'