From 249294a657feae2eea38a3a442bfc50c1e69827b Mon Sep 17 00:00:00 2001
From: Harpreet Sangar <happy_san@protonmail.com>
Date: Tue, 17 Jan 2023 09:49:17 +0530
Subject: [PATCH] Index `foo_sequence_id` field that stores sequence_id of
 referenced document.

---
 src/field.cpp                 | 7 +++++++
 test/collection_join_test.cpp | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/src/field.cpp b/src/field.cpp
index 814c3c54..d29e909a 100644
--- a/src/field.cpp
+++ b/src/field.cpp
@@ -697,6 +697,13 @@ Option<bool> field::json_field_to_field(bool enable_nested_fields, nlohmann::jso
                   field_json[fields::reference])
     );
 
+    if (!field_json[fields::reference].get<std::string>().empty()) {
+        the_fields.emplace_back(
+                field(field_json[fields::name].get<std::string>() + "_sequence_id", "string", false,
+                      false, true)
+        );
+    }
+
     return Option<bool>(true);
 }
 
diff --git a/test/collection_join_test.cpp b/test/collection_join_test.cpp
index 0065e8ae..81a311bb 100644
--- a/test/collection_join_test.cpp
+++ b/test/collection_join_test.cpp
@@ -92,5 +92,10 @@ TEST_F(CollectionJoinTest, SchemaReferenceField) {
 
     ASSERT_EQ(schema.at("customer_name").reference, "");
     ASSERT_EQ(schema.at("product_id").reference, "Products.product_id");
+    ASSERT_EQ(schema.count("product_id_sequence_id"), 1);
+
+    auto field = schema.at("product_id_sequence_id");
+    ASSERT_TRUE(field.index);
+
     collectionManager.drop_collection("Customers");
 }
\ No newline at end of file