Fix bug in CorrelatedSubqueryUnnestSolver

[andyfengHKU]

Description

See title.

Fixes #4080

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Benchmark Result

Master commit hash: bc30d76d2cbd8ecd6507a55695962460a0817466
Branch commit hash: 9e92fdc35396c54f6db1d192671d36b53686e9db

Query Group	Query Name	Mean Time - Commit (ms)	Mean Time - Master (ms)	Diff
aggregation	q24	669.96	668.54	1.41 (0.21%)
aggregation	q28	10945.63	11730.57	-784.94 (-6.69%)
filter	q14	142.78	144.47	-1.69 (-1.17%)
filter	q15	144.27	143.05	1.22 (0.85%)
filter	q16	320.86	331.58	-10.72 (-3.23%)
filter	q17	463.57	471.59	-8.03 (-1.70%)
filter	q18	1953.63	1976.14	-22.52 (-1.14%)
fixed_size_expr_evaluator	q07	558.47	554.32	4.15 (0.75%)
fixed_size_expr_evaluator	q08	765.46	775.07	-9.60 (-1.24%)
fixed_size_expr_evaluator	q09	770.29	790.92	-20.63 (-2.61%)
fixed_size_expr_evaluator	q10	256.73	260.69	-3.96 (-1.52%)
fixed_size_expr_evaluator	q11	251.88	255.86	-3.97 (-1.55%)
fixed_size_expr_evaluator	q12	249.90	250.50	-0.60 (-0.24%)
fixed_size_expr_evaluator	q13	1484.91	1510.89	-25.98 (-1.72%)
fixed_size_seq_scan	q23	134.01	136.11	-2.10 (-1.55%)
join	q31	11.78	12.09	-0.31 (-2.53%)
ldbc_snb_ic	q35	882.72	897.13	-14.41 (-1.61%)
ldbc_snb_ic	q36	55.49	46.46	9.03 (19.45%)
ldbc_snb_is	q32	9.73	8.50	1.23 (14.52%)
ldbc_snb_is	q33	16.17	13.72	2.45 (17.89%)
ldbc_snb_is	q34	8.45	7.86	0.59 (7.46%)
multi-rel	multi-rel-large-scan	2839.05	2819.24	19.81 (0.70%)
multi-rel	multi-rel-lookup	60.32	56.25	4.06 (7.22%)
multi-rel	multi-rel-small-scan	54.90	58.67	-3.77 (-6.42%)
order_by	q25	148.50	149.75	-1.25 (-0.84%)
order_by	q26	463.67	464.82	-1.15 (-0.25%)
order_by	q27	1426.83	1439.58	-12.75 (-0.89%)
scan_after_filter	q01	192.13	190.09	2.03 (1.07%)
scan_after_filter	q02	177.96	177.98	-0.02 (-0.01%)
shortest_path_ldbc100	q39	48.09	48.82	-0.73 (-1.49%)
var_size_expr_evaluator	q03	2090.83	2076.72	14.11 (0.68%)
var_size_expr_evaluator	q04	2280.25	2296.88	-16.64 (-0.72%)
var_size_expr_evaluator	q05	2632.79	2732.22	-99.43 (-3.64%)
var_size_expr_evaluator	q06	1344.50	1356.46	-11.95 (-0.88%)
var_size_seq_scan	q19	1487.91	1495.05	-7.14 (-0.48%)
var_size_seq_scan	q20	3247.69	3187.65	60.04 (1.88%)
var_size_seq_scan	q21	2469.85	2412.56	57.28 (2.37%)
var_size_seq_scan	q22	133.32	134.32	-1.00 (-0.75%)