feat: Add event trigger to handle job cleanup on table drop in vector…

…ize schema (#178)

* feat: Add event trigger to handle job cleanup on table drop in vectorize schema

Signed-off-by: Akhilender <[email protected]>

* fix: made requested changes-1

* fix: added corresponding integration test

* fix: minor-fix in meta.sql file

* fix: integration_test test_event_trigger_on_table_drop

* fix: remove debugging notices

---------

Signed-off-by: Akhilender <[email protected]>

extension/sql/meta.sql

@@ -20,6 +20,33 @@ GRANT SELECT ON ALL SEQUENCES IN SCHEMA vectorize TO pg_monitor;
 ALTER DEFAULT PRIVILEGES IN SCHEMA vectorize GRANT SELECT ON TABLES TO pg_monitor;
 ALTER DEFAULT PRIVILEGES IN SCHEMA vectorize GRANT SELECT ON SEQUENCES TO pg_monitor;
 
+CREATE OR REPLACE FUNCTION handle_table_drop()
+RETURNS event_trigger AS $$
+DECLARE
+    obj RECORD;
+    schema_name TEXT;
+    table_name TEXT;
+BEGIN
+    FOR obj IN SELECT * FROM pg_event_trigger_dropped_objects() LOOP
+        IF obj.object_type = 'table' THEN
+            schema_name := split_part(obj.object_identity, '.', 1);  
+            table_name := split_part(obj.object_identity, '.', 2);  
+
+            -- Perform cleanup: delete the associated job from the vectorize.job table
+            DELETE FROM vectorize.job
+            WHERE params ->> 'table' = table_name
+            AND params ->> 'schema' = schema_name;
+        END IF;
+    END LOOP;
+END;
+$$ LANGUAGE plpgsql;
+
+DROP EVENT TRIGGER IF EXISTS vectorize_job_drop_trigger;
+
+CREATE EVENT TRIGGER vectorize_job_drop_trigger
+ON sql_drop
+WHEN TAG IN ('DROP TABLE')
+EXECUTE FUNCTION handle_table_drop();
 
 INSERT INTO vectorize.prompts (prompt_type, sys_prompt, user_prompt)
 VALUES (

extension/tests/integration_tests.rs

@@ -860,3 +860,66 @@ async fn test_cohere() {
             .unwrap();
     assert_eq!(search_results.len(), 3);
 }
+
+#[ignore]
+#[tokio::test]
+async fn test_event_trigger_on_table_drop() {
+    let conn = common::init_database().await;
+    let mut rng = rand::thread_rng();
+    let test_num = rng.gen_range(1..100000);
+    let test_table_name = format!("products_test_{}", test_num);
+    let job_name = format!("job_{}", test_num);
+
+    // Initialize the test table and job
+    common::init_test_table(&test_table_name, &conn).await;
+    common::init_embedding_svc_url(&conn).await;
+
+    let _ = sqlx::query(&format!(
+        "SELECT vectorize.table(
+        job_name => '{job_name}',
+        \"table\" => '{test_table_name}',
+        primary_key => 'product_id',
+        columns => ARRAY['product_name'],
+        transformer => 'sentence-transformers/all-MiniLM-L6-v2'
+    );"
+    ))
+    .execute(&conn)
+    .await
+    .expect("failed to initialize vectorize job");
+
+    // Check the job table before dropping the test table
+    let job_count_before = common::row_count("vectorize.job", &conn).await;
+    assert_eq!(job_count_before, 1);
+
+    // Drop the test table
+    let drop_result = sqlx::query(&format!("DROP TABLE {test_table_name} CASCADE;"))
+        .execute(&conn)
+        .await;
+    assert!(drop_result.is_ok(), "Failed to drop the test table");
+
+    // Debug: Check job table after dropping the test table
+    let job_count_after = common::row_count("vectorize.job", &conn).await;
+    assert_eq!(job_count_after, 0, "Job entry was not removed after table drop");
+
+    // Check if the job was deleted
+    let deleted_job = sqlx::query("SELECT * FROM vectorize.job WHERE params->>'table' = $1 AND params->>'schema' = $2")
+        .bind(test_table_name)
+        .bind("public")
+        .fetch_optional(&conn)
+        .await
+        .expect("Failed to fetch job");
+
+    assert!(deleted_job.is_none(), "Job was not deleted after table drop");
+
+    // Attempt to drop a non-associated table and verify no action is taken
+    let unrelated_table_name = format!("unrelated_test_{}", test_num);
+    common::init_test_table(&unrelated_table_name, &conn).await;
+    let _ = sqlx::query(&format!("DROP TABLE {unrelated_table_name};"))
+        .execute(&conn)
+        .await
+        .expect("Failed to drop the unrelated test table");
+
+    // Ensure vectorize.job is unaffected
+    let final_job_count = common::row_count("vectorize.job", &conn).await;
+    assert_eq!(final_job_count, 0, "vectorize.job should remain unaffected by unrelated table drops");
+}