[Enhancement](nereids)support show backup in nereids

[lsy3993]

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

None

Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[hello-stephen]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[lsy3993]

run buildall

[doris-robot]

TPC-H: Total hot run time: 32440 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit 13f245306b45d96024d1983afe1f2c22bf6c3a69, data reload: false

------ Round 1 ----------------------------------
q1	17582	5336	5092	5092
q2	2044	296	166	166
q3	10412	1235	739	739
q4	10226	1055	514	514
q5	7514	2388	2354	2354
q6	195	173	144	144
q7	897	748	608	608
q8	9317	1305	1066	1066
q9	4858	4656	4724	4656
q10	6856	2314	1871	1871
q11	485	289	265	265
q12	352	355	221	221
q13	17775	3622	3054	3054
q14	232	228	215	215
q15	536	496	492	492
q16	652	608	591	591
q17	583	861	355	355
q18	6724	6353	6344	6344
q19	1345	956	553	553
q20	326	331	199	199
q21	2970	2150	1976	1976
q22	1031	1012	965	965
Total cold run time: 102912 ms
Total hot run time: 32440 ms

----- Round 2, with runtime_filter_mode=off -----
q1	5192	5145	5131	5131
q2	241	331	233	233
q3	2114	2657	2281	2281
q4	1401	1821	1371	1371
q5	4230	4134	4124	4124
q6	212	166	125	125
q7	1910	1952	1773	1773
q8	2651	2738	2600	2600
q9	7416	7234	7331	7234
q10	3012	3247	2795	2795
q11	586	522	509	509
q12	723	760	609	609
q13	3404	3998	3278	3278
q14	281	285	273	273
q15	518	471	473	471
q16	644	679	631	631
q17	1145	1545	1360	1360
q18	7852	7671	7450	7450
q19	865	839	917	839
q20	2007	2065	1882	1882
q21	5592	4925	4769	4769
q22	1131	1030	1004	1004
Total cold run time: 53127 ms
Total hot run time: 50742 ms

[doris-robot]

TPC-DS: Total hot run time: 192383 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpcds-tools
TPC-DS sf100 test result on commit 13f245306b45d96024d1983afe1f2c22bf6c3a69, data reload: false

query1	1358	1008	970	970
query2	6209	1897	1897	1897
query3	11001	4558	4567	4558
query4	56068	25721	23206	23206
query5	4955	513	501	501
query6	353	213	183	183
query7	4932	514	288	288
query8	327	247	244	244
query9	5798	2500	2523	2500
query10	437	300	261	261
query11	15145	15125	14922	14922
query12	158	116	107	107
query13	1053	537	401	401
query14	10601	6900	6795	6795
query15	216	205	190	190
query16	7100	661	469	469
query17	1073	743	591	591
query18	1553	428	319	319
query19	207	199	176	176
query20	139	125	123	123
query21	208	122	108	108
query22	4425	4641	4448	4448
query23	33865	33430	33341	33341
query24	5681	2463	2480	2463
query25	476	482	397	397
query26	706	293	163	163
query27	1720	503	338	338
query28	2713	2404	2450	2404
query29	583	578	436	436
query30	267	225	188	188
query31	888	869	815	815
query32	79	65	61	61
query33	456	358	305	305
query34	761	888	492	492
query35	818	827	742	742
query36	927	996	893	893
query37	122	109	71	71
query38	4340	4336	4087	4087
query39	1480	1424	1443	1424
query40	214	118	108	108
query41	54	51	54	51
query42	132	110	111	110
query43	497	518	477	477
query44	1357	821	827	821
query45	185	172	176	172
query46	858	1014	649	649
query47	1793	1865	1779	1779
query48	392	417	307	307
query49	723	529	421	421
query50	685	734	418	418
query51	4275	4362	4331	4331
query52	121	112	100	100
query53	241	270	188	188
query54	499	521	449	449
query55	83	80	82	80
query56	269	300	266	266
query57	1118	1186	1170	1170
query58	247	249	230	230
query59	2694	3006	2693	2693
query60	288	291	269	269
query61	132	123	119	119
query62	763	745	684	684
query63	246	200	199	199
query64	1719	1036	701	701
query65	4513	4328	4329	4328
query66	713	394	306	306
query67	15710	15633	15331	15331
query68	8032	887	503	503
query69	543	300	275	275
query70	1209	1103	1118	1103
query71	487	304	276	276
query72	5785	3643	3760	3643
query73	1439	730	342	342
query74	9154	8902	8985	8902
query75	3740	3165	2674	2674
query76	4156	1204	766	766
query77	591	382	280	280
query78	10118	10362	9334	9334
query79	2617	874	584	584
query80	857	537	439	439
query81	472	256	218	218
query82	675	129	101	101
query83	282	173	154	154
query84	277	95	76	76
query85	836	355	308	308
query86	393	306	274	274
query87	4446	4465	4364	4364
query88	3412	2234	2236	2234
query89	417	322	285	285
query90	1944	222	217	217
query91	154	143	111	111
query92	77	63	60	60
query93	1276	1077	598	598
query94	696	433	302	302
query95	356	282	259	259
query96	489	566	277	277
query97	3415	3391	3297	3297
query98	243	208	206	206
query99	1450	1403	1287	1287
Total cold run time: 299757 ms
Total hot run time: 192383 ms

[doris-robot]

ClickBench: Total hot run time: 31.04 s

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/clickbench-tools
ClickBench test result on commit 13f245306b45d96024d1983afe1f2c22bf6c3a69, data reload: false

query1	0.04	0.03	0.03
query2	0.07	0.04	0.03
query3	0.23	0.06	0.07
query4	1.67	0.10	0.10
query5	0.55	0.55	0.54
query6	1.20	0.71	0.71
query7	0.02	0.02	0.02
query8	0.04	0.03	0.03
query9	0.59	0.52	0.50
query10	0.58	0.63	0.59
query11	0.15	0.10	0.11
query12	0.14	0.11	0.11
query13	0.62	0.62	0.60
query14	2.80	2.70	2.69
query15	0.91	0.85	0.86
query16	0.38	0.38	0.38
query17	1.06	1.05	0.99
query18	0.21	0.19	0.19
query19	1.89	1.78	1.99
query20	0.01	0.01	0.01
query21	15.37	0.88	0.59
query22	0.74	1.29	0.71
query23	14.80	1.36	0.64
query24	7.00	0.96	1.12
query25	0.49	0.20	0.13
query26	0.69	0.17	0.13
query27	0.06	0.06	0.05
query28	8.96	0.92	0.44
query29	12.59	3.90	3.32
query30	0.25	0.09	0.07
query31	2.82	0.59	0.38
query32	3.39	0.56	0.47
query33	3.03	3.01	3.01
query34	15.86	5.09	4.52
query35	4.56	4.53	4.52
query36	0.66	0.50	0.48
query37	0.09	0.06	0.06
query38	0.05	0.04	0.03
query39	0.04	0.02	0.02
query40	0.18	0.13	0.12
query41	0.08	0.03	0.03
query42	0.03	0.02	0.02
query43	0.03	0.03	0.03
Total cold run time: 104.93 s
Total hot run time: 31.04 s

[starocean999]

Suggested change

	public Predicate<String> getSnapshotPredicate() throws AnalysisException {
	private Predicate<String> getSnapshotPredicate() throws AnalysisException {

[starocean999]

Suggested change

	public ShowResultSetMetaData getMetaData() {
	private ShowResultSetMetaData getMetaData() {

[starocean999]

Suggested change

public String getDbName() {