Fix UPSERT bug on camelCase PK column

test/fixtures/data.sql

@@ -411,3 +411,6 @@ INSERT INTO zone VALUES (4, 'store 4', 3, 1);
 
 -- for foreign table projects_dump
 copy (select id, name, client_id from projects) to '/tmp/projects_dump.csv' with csv;
+
+TRUNCATE TABLE "UnitTest" CASCADE;
+INSERT INTO "UnitTest" VALUES (1, 'unit test 1');

test/fixtures/privileges.sql

@@ -79,6 +79,7 @@ GRANT ALL ON TABLE
     , space
     , zone
     , projects_dump
+    , "UnitTest"
 TO postgrest_test_anonymous;
 
 GRANT INSERT ON TABLE insertonly TO postgrest_test_anonymous;

test/fixtures/schema.sql

@@ -1451,3 +1451,8 @@ comment on foreign table projects_dump is
 $$A temporary projects dump
 
 Just a test for foreign tables$$;
+
+create table "UnitTest"(
+  "idUnitTest" integer primary key,
+  "nameUnitTest" text
+);