fix(promql-planner): update ctx field columns of OR operator (#5556)

* fix(promql-planner): update ctx field columns of OR operator

* test: add sqlness test

src/query/src/promql/planner.rs

@@ -2418,6 +2418,7 @@ impl PromPlanner {
         // step 4: update context
         self.ctx.time_index_column = Some(left_time_index_column);
         self.ctx.tag_columns = all_tags.into_iter().collect();
+        self.ctx.field_columns = vec![left_field_col.to_string()];
 
         Ok(result)
     }
@@ -3343,6 +3344,41 @@ mod test {
         }
     }
 
+    #[tokio::test]
+    async fn test_nested_binary_op() {
+        let mut eval_stmt = EvalStmt {
+            expr: PromExpr::NumberLiteral(NumberLiteral { val: 1.0 }),
+            start: UNIX_EPOCH,
+            end: UNIX_EPOCH
+                .checked_add(Duration::from_secs(100_000))
+                .unwrap(),
+            interval: Duration::from_secs(5),
+            lookback_delta: Duration::from_secs(1),
+        };
+
+        let case = r#"sum(rate(nginx_ingress_controller_requests{job=~".*"}[2m])) -
+        (
+            sum(rate(nginx_ingress_controller_requests{namespace=~".*"}[2m]))
+            or
+            vector(0)
+        )"#;
+
+        let prom_expr = parser::parse(case).unwrap();
+        eval_stmt.expr = prom_expr;
+        let table_provider = build_test_table_provider_with_fields(
+            &[(
+                DEFAULT_SCHEMA_NAME.to_string(),
+                "nginx_ingress_controller_requests".to_string(),
+            )],
+            &["namespace", "job"],
+        )
+        .await;
+        // Should be ok
+        let _ = PromPlanner::stmt_to_plan(table_provider, &eval_stmt, &build_session_state())
+            .await
+            .unwrap();
+    }
+
     #[tokio::test]
     async fn value_matcher() {
         // template