[GLUTEN-9240][VL] Write NULL value into relation in gluten unit tests

[dcoliversun]

What changes were proposed in this pull request?

This PR aims to write NULL value into relation in gluten unit tests, otherwise it won't offload to native side.

(Fixes: #9240)

How was this patch tested?

Pass original unit tests.

[github-actions]

#9240

[dcoliversun]

cc @jackylee-ch

[jackylee-ch]

This case should also read from relation, could you rewrite it as well?
BTW, ther are same problems with get_json_object.

[dcoliversun]

ok, I check other tests also.

[dcoliversun]

@jackylee-ch gentle ping 😄 it's ready to merge

[GlutenPerfBot]

===== Performance report for TPCDS SF2000 with Velox backend, for reference only ====

query	log/native_master_04_08_2025_time.csv	log/native_master_04_07_2025_ee9146df22_time.csv	difference	percentage
q1	11.19	11.54	0.343	103.07%
q2	11.46	10.89	-0.571	95.02%
q3	2.91	3.13	0.228	107.83%
q4	51.84	50.69	-1.150	97.78%
q5	9.00	9.61	0.611	106.79%
q6	4.92	4.32	-0.601	87.80%
q7	5.06	5.40	0.336	106.63%
q8	4.09	3.48	-0.614	85.01%
q9	13.62	15.61	1.991	114.62%
q10	13.59	11.52	-2.074	84.74%
q11	28.32	28.41	0.094	100.33%
q12	2.83	1.78	-1.052	62.78%
q13	6.95	6.94	-0.010	99.85%
q14a	43.86	42.93	-0.933	97.87%
q14b	39.04	39.73	0.698	101.79%
q15	3.22	2.57	-0.648	79.85%
q16	4.59	4.54	-0.045	99.01%
q17	6.65	5.65	-0.998	84.99%
q18	7.36	8.44	1.089	114.80%
q19	3.15	4.15	0.999	131.75%
q20	3.23	1.97	-1.257	61.01%
q21	1.70	1.26	-0.439	74.19%
q22	3.54	2.61	-0.921	73.94%
q23a	60.90	62.57	1.668	102.74%
q23b	71.70	73.69	1.989	102.77%
q24a	69.46	71.95	2.491	103.59%
q24b	69.43	70.27	0.844	101.22%
q25	5.22	6.27	1.055	120.22%
q26	2.36	2.42	0.062	102.65%
q27	2.47	3.46	0.991	140.13%
q28	17.70	17.21	-0.490	97.23%
q29	7.63	7.48	-0.150	98.03%
q30	5.01	5.17	0.157	103.13%
q31	8.97	7.75	-1.223	86.37%
q32	1.78	1.83	0.050	102.78%
q33	4.44	3.43	-1.012	77.20%
q34	3.71	3.31	-0.400	89.24%
q35	6.52	6.70	0.187	102.87%
q36	2.52	2.59	0.070	102.77%
q37	2.96	3.35	0.393	113.29%
q38	12.55	11.29	-1.263	89.94%
q39a	3.74	4.37	0.628	116.79%
q39b	3.96	4.25	0.294	107.44%
q40	4.00	3.37	-0.629	84.27%
q41	1.38	0.64	-0.733	46.81%
q42	0.83	0.79	-0.037	95.58%
q43	1.97	2.09	0.114	105.78%
q44	6.57	6.53	-0.040	99.39%
q45	3.20	3.27	0.069	102.17%
q46	4.01	3.73	-0.278	93.08%
q47	9.43	10.15	0.711	107.54%
q48	3.47	3.50	0.034	100.99%
q49	5.57	6.81	1.239	122.23%
q50	16.76	16.73	-0.030	99.82%
q51	7.13	7.49	0.357	105.01%
q52	1.03	0.87	-0.165	83.97%
q53	1.52	1.62	0.091	105.99%
q54	6.01	5.72	-0.293	95.13%
q55	1.13	0.63	-0.501	55.71%
q56	3.78	4.62	0.839	122.18%
q57	6.56	6.35	-0.204	96.89%
q58	2.57	3.60	1.027	139.98%
q59	4.54	3.94	-0.600	86.81%
q60	4.68	5.37	0.684	114.62%
q61	4.61	4.29	-0.323	93.00%
q62	2.77	2.82	0.052	101.88%
q63	1.37	1.58	0.210	115.38%
q64	35.21	34.94	-0.276	99.22%
q65	11.74	11.14	-0.605	94.85%
q66	2.72	3.56	0.843	131.00%
q67	58.02	57.82	-0.203	99.65%
q68	2.99	3.51	0.521	117.45%
q69	4.99	5.30	0.312	106.25%
q70	5.90	5.75	-0.158	97.33%
q71	4.52	4.42	-0.104	97.69%
q72	21.64	20.27	-1.377	93.64%
q73	2.94	2.89	-0.050	98.29%
q74	17.34	17.67	0.337	101.94%
q75	22.62	22.69	0.077	100.34%
q76	6.84	6.78	-0.063	99.08%
q77	2.71	2.33	-0.380	85.96%
q78	33.61	32.83	-0.777	97.69%
q79	3.51	3.83	0.313	108.91%
q80	10.70	9.78	-0.920	91.40%
q81	6.53	6.37	-0.163	97.51%
q82	5.55	5.32	-0.232	95.82%
q83	1.44	2.06	0.618	142.75%
q84	2.74	2.90	0.168	106.15%
q85	6.26	6.52	0.257	104.11%
q86	2.89	2.15	-0.741	74.35%
q87	11.79	11.67	-0.123	98.96%
q88	15.49	15.43	-0.057	99.63%
q89	2.28	2.74	0.459	120.09%
q90	2.40	1.94	-0.458	80.91%
q91	3.74	3.95	0.216	105.79%
q92	1.89	1.50	-0.390	79.37%
q93	22.73	23.34	0.601	102.65%
q94	9.07	8.28	-0.786	91.33%
q9	54.85	54.89	0.042	100.08%
q5	1.89	1.99	0.096	105.08%
q96	10.56	10.70	0.140	101.33%
q97	2.72	2.36	-0.366	86.56%
q98	5.45	5.34	-0.108	98.01%
q99	0.65	0.36	-0.291	55.33%
total	1168.95	1168.34	-0.614	99.95%