Fix json null

[acquamarin]

Closes #5183
Added tests as described in the issue

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.97%. Comparing base (31c789b) to head (2c87658).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5202      +/-   ##
==========================================
- Coverage   86.97%   86.97%   -0.01%     
==========================================
  Files        1405     1405              
  Lines       61622    61622              
  Branches     7543     7543              
==========================================
- Hits        53596    53594       -2     
- Misses       7852     7854       +2     
  Partials      174      174              

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[github-actions]

Benchmark Result

Master commit hash: 3e78d1cd7be3854686796c14c6005aa79d876ba5
Branch commit hash: 6b3dc9e5a2adb6dc03b593ed1597497f551346ca

Query Group	Query Name	Mean Time - Commit (ms)	Mean Time - Master (ms)	Diff
aggregation	q24	723.83	731.53	-7.70 (-1.05%)
aggregation	q28	6554.44	6707.50	-153.06 (-2.28%)
copy	node-Comment	189549.61	N/A	N/A
copy	node-Forum	12754.32	N/A	N/A
copy	node-Organisation	1205.10	N/A	N/A
copy	node-Person	2866.06	N/A	N/A
copy	node-Place	1208.11	N/A	N/A
copy	node-Post	81657.82	N/A	N/A
copy	node-Tag	1228.28	N/A	N/A
copy	node-Tagclass	1120.11	N/A	N/A
copy	rel-comment-hasCreator	134877.71	N/A	N/A
copy	rel-comment-hasTag	110752.57	N/A	N/A
copy	rel-comment-isLocatedIn	78315.39	N/A	N/A
copy	rel-containerOf	23715.54	N/A	N/A
copy	rel-forum-hasTag	5061.34	N/A	N/A
copy	rel-hasInterest	5881.84	N/A	N/A
copy	rel-hasMember	94595.88	N/A	N/A
copy	rel-hasModerator	1257.94	N/A	N/A
copy	rel-hasType	296.74	N/A	N/A
copy	rel-isPartOf	238.53	N/A	N/A
copy	rel-isSubclassOf	271.15	N/A	N/A
copy	rel-knows	21085.77	N/A	N/A
copy	rel-likes-comment	179602.08	N/A	N/A
copy	rel-likes-post	70895.60	N/A	N/A
copy	rel-organisation-isLocatedIn	337.21	N/A	N/A
copy	rel-person-isLocatedIn	702.96	N/A	N/A
copy	rel-post-hasCreator	18685.75	N/A	N/A
copy	rel-post-hasTag	35609.47	N/A	N/A
copy	rel-post-isLocatedIn	22356.64	N/A	N/A
copy	rel-replyOf-comment	69263.00	N/A	N/A
copy	rel-replyOf-post	56150.75	N/A	N/A
copy	rel-studyAt	737.96	N/A	N/A
copy	rel-workAt	1089.99	N/A	N/A
filter	q14	127.60	125.90	1.70 (1.35%)
filter	q15	125.57	126.25	-0.68 (-0.54%)
filter	q16	343.74	342.48	1.26 (0.37%)
filter	q17	446.46	444.42	2.04 (0.46%)
filter	q18	1910.04	2002.72	-92.68 (-4.63%)
filter	zonemap-node	88.49	88.62	-0.13 (-0.14%)
filter	zonemap-node-lhs-cast	89.10	88.41	0.69 (0.78%)
filter	zonemap-node-null	88.97	88.11	0.86 (0.98%)
filter	zonemap-rel	5313.24	5760.93	-447.69 (-7.77%)
fixed_size_expr_evaluator	q07	678.37	682.51	-4.14 (-0.61%)
fixed_size_expr_evaluator	q08	962.44	971.18	-8.74 (-0.90%)
fixed_size_expr_evaluator	q09	960.72	967.41	-6.69 (-0.69%)
fixed_size_expr_evaluator	q10	253.67	261.03	-7.36 (-2.82%)
fixed_size_expr_evaluator	q11	255.89	261.81	-5.92 (-2.26%)
fixed_size_expr_evaluator	q12	232.76	242.04	-9.28 (-3.83%)
fixed_size_expr_evaluator	q13	1563.96	1572.46	-8.49 (-0.54%)
fixed_size_seq_scan	q23	114.95	128.11	-13.16 (-10.27%)
join	q29	675.49	698.01	-22.52 (-3.23%)
join	q30	1631.97	1680.38	-48.42 (-2.88%)
join	q31	5.77	5.45	0.32 (5.96%)
join	SelectiveTwoHopJoin	52.91	52.51	0.40 (0.76%)
ldbc_snb_ic	q35	10.05	8.81	1.24 (14.07%)
ldbc_snb_ic	q36	107.80	95.82	11.98 (12.50%)
ldbc_snb_is	q32	5.95	4.10	1.85 (45.00%)
ldbc_snb_is	q33	14.58	10.39	4.19 (40.28%)
ldbc_snb_is	q34	1.22	1.30	-0.08 (-6.04%)
multi-rel	multi-rel-large-scan	1716.94	1704.65	12.28 (0.72%)
multi-rel	multi-rel-lookup	12.67	12.10	0.57 (4.70%)
multi-rel	multi-rel-small-scan	196.83	208.16	-11.33 (-5.44%)
order_by	q25	127.15	133.92	-6.77 (-5.06%)
order_by	q26	447.58	448.66	-1.08 (-0.24%)
order_by	q27	1384.62	1407.34	-22.72 (-1.61%)
recursive_join	recursive-join-bidirection	289.91	301.40	-11.50 (-3.82%)
recursive_join	recursive-join-dense	5076.66	7161.86	-2085.20 (-29.12%)
recursive_join	recursive-join-path	22547.64	23268.13	-720.49 (-3.10%)
recursive_join	recursive-join-sparse	627.11	631.45	-4.35 (-0.69%)
recursive_join	recursive-join-trail	5703.35	7060.64	-1357.29 (-19.22%)
scan_after_filter	q01	171.32	171.48	-0.16 (-0.09%)
scan_after_filter	q02	153.60	154.38	-0.78 (-0.51%)
shortest_path_ldbc100	q37	84.58	92.84	-8.25 (-8.89%)
shortest_path_ldbc100	q38	329.44	337.02	-7.57 (-2.25%)
shortest_path_ldbc100	q39	64.09	61.29	2.80 (4.57%)
shortest_path_ldbc100	q40	406.96	356.73	50.24 (14.08%)
var_size_expr_evaluator	q03	2108.92	2100.75	8.17 (0.39%)
var_size_expr_evaluator	q04	2208.31	2281.93	-73.62 (-3.23%)
var_size_expr_evaluator	q05	2685.79	2737.37	-51.58 (-1.88%)
var_size_expr_evaluator	q06	1356.47	1370.93	-14.46 (-1.05%)
var_size_seq_scan	q19	1444.73	1438.67	6.06 (0.42%)
var_size_seq_scan	q20	2280.16	2722.54	-442.38 (-16.25%)
var_size_seq_scan	q21	2241.40	2295.40	-54.00 (-2.35%)
var_size_seq_scan	q22	126.33	126.93	-0.60 (-0.48%)