fix

Author: aljazerzen

web/book/tests/snapshots/snapshot__transforms__sort__nulls__0.snap

@@ -1,13 +1,19 @@
 ---
 source: web/book/tests/snapshot.rs
-expression: "prql target:sql.duckdb\n\nfrom artists\nsort artist_id\ntake 42\n"
+expression: "from artists\nsort {artist_id != null, artist_id} # nulls first\n"
 ---
+WITH table_1 AS (
+  SELECT
+    *,
+    artist_id IS NOT NULL AS _expr_0
+  FROM
+    artists
+)
 SELECT
   *
 FROM
-  artists
+  table_1 AS table_0
 ORDER BY
-  artist_id
-LIMIT
-  42
+  _expr_0 NULLS LAST,
+  artist_id NULLS LAST