Add is.null test

test/spec/Feature/Query/RelatedQueriesSpec.hs

@@ -257,14 +257,21 @@ spec = describe "related queries" $ do
         , matchHeaders = [matchContentTypeJson]
         }
 
-    -- "?table=not.is.null" does a "NOT table IS NULL" instead of a "table IS NOT NULL"
-    -- https://github.com/PostgREST/postgrest/issues/2800#issuecomment-1562620508
-    it "embeds even if the target relationship has a row with a NULL value in any of its columns" $
+    -- "?table=not.is.null" does a "table IS DISTINCT FROM NULL" instead of a "table IS NOT NULL"
+    -- https://github.com/PostgREST/postgrest/issues/2800#issuecomment-1720315818
+    it "embeds verifying that the entire target table row is not null" $ do
       get "/table_b?select=name,table_a(name)&table_a=not.is.null" `shouldRespondWith`
         [json|[
-          {"name":"Test 1","table_a":{"name":"Not null"}},
+          {"name":"Test 1","table_a":{"name":"Not null 1"}},
           {"name":"Test 2","table_a":{"name":null}}
         ]|]
         { matchStatus  = 200
         , matchHeaders = [matchContentTypeJson]
         }
+      get "/table_b?select=name,table_a()&table_a=is.null" `shouldRespondWith`
+        [json|[
+          {"name":"Test 3"}
+        ]|]
+        { matchStatus  = 200
+        , matchHeaders = [matchContentTypeJson]
+        }

test/spec/fixtures/data.sql

@@ -855,6 +855,6 @@ INSERT INTO bitchar_with_length(bit, char) VALUES ('00000', 'aaaaa');
 INSERT INTO bitchar_with_length(bit, char) VALUES ('11111', 'bbbbb');
 
 TRUNCATE TABLE table_a CASCADE;
-INSERT INTO table_a(id, name) VALUES (1, 'Not null'), (2, null);
+INSERT INTO table_a(id, name) VALUES (1, 'Not null 1'), (2, null), (3, 'Not null 2');
 TRUNCATE TABLE table_b CASCADE;
-INSERT INTO table_b(table_a_id, name) VALUES (1, 'Test 1'), (2, 'Test 2');
+INSERT INTO table_b(table_a_id, name) VALUES (1, 'Test 1'), (2, 'Test 2'), (null, 'Test 3');