From dbf389fb28f13fca495c1a818e4da966745c13e8 Mon Sep 17 00:00:00 2001
From: Raminder Singh <romi_ssk@yahoo.co.in>
Date: Thu, 3 Sep 2026 13:03:04 +0530
Subject: [PATCH] refactor: do not fail Rust deserialization when search_path
 is empty

When search_path was empty the context returned a null value, which Rust failed
to parse as a Vec. Now we return an empty array if search_path is empty.
---
 sql/load_sql_context.sql    |  7 ++++++-
 test/expected/issue_650.out | 24 ++++++++++++++++++++++++
 test/sql/issue_650.sql      | 19 +++++++++++++++++++
 3 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 test/expected/issue_650.out
 create mode 100644 test/sql/issue_650.sql

diff --git a/sql/load_sql_context.sql b/sql/load_sql_context.sql
index d8a460e1..fc91f4c4 100644
--- a/sql/load_sql_context.sql
+++ b/sql/load_sql_context.sql
@@ -34,7 +34,12 @@ schemas_(oid, name) as (
 select
     jsonb_build_object(
         'config', jsonb_build_object(
-            'search_path', (select array_agg(schema_oid) from search_path_oids),
+            -- array_agg returns null when the search path is empty. Coalesce so
+            -- the context still deserializes into a (empty) sequence. Issue #650
+            'search_path', coalesce(
+                (select array_agg(schema_oid) from search_path_oids),
+                '{}'::oid[]
+            ),
             'role', current_role,
             'schema_version', graphql.get_schema_version()
         ),
diff --git a/test/expected/issue_650.out b/test/expected/issue_650.out
new file mode 100644
index 00000000..78f4e328
--- /dev/null
+++ b/test/expected/issue_650.out
@@ -0,0 +1,24 @@
+begin;
+    create table test_table (
+        id serial primary key,
+        name text not null,
+        description text
+    );
+    comment on schema public is e'@graphql({"introspection": true})';
+    -- baseline: a non-empty search_path resolves fine
+    set local search_path to public;
+    select graphql.resolve('{ __typename }');
+              resolve              
+-----------------------------------
+ {"data": {"__typename": "Query"}}
+(1 row)
+
+    -- an empty search_path should also resolve, with no visible schemas
+    set local search_path to '';
+    select graphql.resolve('{ __typename }');
+              resolve              
+-----------------------------------
+ {"data": {"__typename": "Query"}}
+(1 row)
+
+rollback;
diff --git a/test/sql/issue_650.sql b/test/sql/issue_650.sql
new file mode 100644
index 00000000..ea78901e
--- /dev/null
+++ b/test/sql/issue_650.sql
@@ -0,0 +1,19 @@
+begin;
+
+    create table test_table (
+        id serial primary key,
+        name text not null,
+        description text
+    );
+
+    comment on schema public is e'@graphql({"introspection": true})';
+
+    -- baseline: a non-empty search_path resolves fine
+    set local search_path to public;
+    select graphql.resolve('{ __typename }');
+
+    -- an empty search_path should also resolve, with no visible schemas
+    set local search_path to '';
+    select graphql.resolve('{ __typename }');
+
+rollback;