[fix](planner)cast expr should do nothing in compactForLiteral method

[starocean999]

Proposed changes

Issue Number: close #xxx

Further comments

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[starocean999]

run buildall

[doris-robot]

ClickBench: Total hot run time: 31.09 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit 8fc98094039ad9ec3587accad92ecaa3beb0f5ea, data reload: false

query1	0.03	0.03	0.02
query2	0.08	0.03	0.04
query3	0.23	0.05	0.05
query4	1.67	0.08	0.08
query5	0.50	0.52	0.52
query6	1.24	0.85	0.82
query7	0.02	0.02	0.01
query8	0.05	0.04	0.04
query9	0.50	0.46	0.44
query10	0.49	0.50	0.49
query11	0.14	0.11	0.12
query12	0.14	0.11	0.11
query13	0.66	0.66	0.63
query14	0.91	0.97	1.04
query15	0.85	0.83	0.86
query16	0.37	0.37	0.37
query17	1.02	1.02	1.04
query18	0.19	0.27	0.22
query19	1.85	1.78	1.80
query20	0.02	0.01	0.02
query21	15.41	0.65	0.65
query22	3.80	7.31	1.78
query23	18.27	1.35	1.27
query24	1.42	0.39	0.26
query25	0.15	0.10	0.10
query26	0.26	0.18	0.17
query27	0.09	0.09	0.09
query28	13.47	1.02	1.01
query29	12.70	3.40	3.37
query30	0.26	0.07	0.06
query31	2.83	0.40	0.41
query32	3.24	0.49	0.49
query33	2.74	2.81	2.72
query34	17.05	4.46	4.55
query35	4.50	4.54	4.68
query36	0.64	0.47	0.48
query37	0.22	0.18	0.18
query38	0.19	0.18	0.18
query39	0.05	0.05	0.04
query40	0.17	0.15	0.15
query41	0.11	0.06	0.06
query42	0.06	0.05	0.06
query43	0.05	0.05	0.04
Total cold run time: 108.64 s
Total hot run time: 31.09 s

[github-actions]

PR approved by at least one committer and no changes requested.

[github-actions]

PR approved by anyone and no changes requested.