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+```console
+❯ tree data/
+data/
+├── c
+│   ├── 1.json
+│   └── 2.json
+└── j
+    ├── 1.json
+    └── 2.json
+```
+
+```console
+> SELECT . FROM c
+{"id":2,"j_id":3}
+{"foo":"bar","id":1,"j_id":1}
+
+> SELECT id FROM c
+{"c.id":2}
+{"c.id":1}
+
+> SELECT c.id, j.id, is_j FROM c LEFT JOIN j ON j.id == c.j_id
+{"c.id":2,"is_j":null,"j.id":null}
+{"c.id":1,"is_j":true,"j.id":1}
+
+> SELECT c.id, j.id FROM c RIGHT JOIN j ON j.id == c.j_id
+{"c.id":null,"j.id":2}
+{"c.id":1,"j.id":1}
+
+> SELECT c.id, j.id FROM c FULL JOIN j ON j.id == c.j_id
+{"c.id":2,"j.id":null}
+{"c.id":1,"j.id":1}
+{"c.id":null,"j.id":2}
+```