[Bug] mo-tool checkpoint dump fails: cannot resolve exact schema for table from checkpoint metadata

[Ariznawlll]

Summary

mo-tool ckp dump 在 PITR checkpoint dump 测试中成功导出了 38 张表后，对 table 273094 执行 show create table 时报错：

Error: show create table 273094: internal error: cannot resolve exact schema for table 273094 from checkpoint metadata; mo_tables/mo_columns data is unavailable or incomplete

CI Run: https://github.com/matrixorigin/mo-nightly-regression/actions/runs/29523958842/job/87712581316
Workflow: PITR Backup Restore Test 4.0-dev
Job: CHECKPOINT DUMP S3 WITH PITR DATA
Branch: main
MO Commit: ce99d329cf (cherrypick: add copy grants #25812)
Time: 2026-07-16 18:48 - 19:39 UTC

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Error Details

Execution Flow

1. mo-tool ckp dump 成功从 S3 checkpoint 中导出了 38 张表（包括 big_data_test 下的多张大表，最大 100M 行）
2. CSV pipeline 正常完成，所有表的 dump 和写入均成功
3. 在导出完成后，执行 show create table 273094 时失败

Error Message

Dumped 38 tables to big_data_test_db_273086
Error: show create table 273094: internal error: cannot resolve exact schema for table 273094 from checkpoint metadata; mo_tables/mo_columns data is unavailable or incomplete

Last Successfully Dumped Tables (before error)

Table 273160 big_data_test.table_with_sortkey_for_insert_100m → OK
Table 273161 big_data_test.table_with_sortkey_for_insert_1b → OK
Table 273162 big_data_test.table_with_sortkey_for_load_100m → OK
Table 273163 big_data_test.table_with_sortkey_for_load_1b → OK
Dumped 38 tables to big_data_test_db_273086 → OK
Error: show create table 273094 → FAILED

Table 273094 不在已成功导出的 38 张表中，但在 dump 完成后尝试获取其 schema 时失败。

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History

Date	Result
2026-07-12	✅ success
2026-07-13	⏹ cancelled (workflow cancelled)
2026-07-14	⏭ skipped
2026-07-15	⏭ skipped
2026-07-16	🔴 failure

此前该测试正常通过，07-16 首次出现此错误。

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Expected Behavior

mo-tool ckp dump 应该能够从 checkpoint metadata 中正确解析所有表的 schema，包括 mo_tables/mo_columns 中的元数据。

Actual Behavior

对特定表 (table ID 273094) 的 schema 解析失败，提示 mo_tables/mo_columns data is unavailable or incomplete。可能原因：

1. PITR 恢复后 checkpoint 中的 catalog 数据不完整
2. mo-tool 的 schema 解析逻辑对某些表类型/situation 处理不正确
3. 表 273094 在 PITR 时间点之后被创建/修改，checkpoint 中未包含其完整的 catalog 信息

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Environment

• MatrixOne: main branch, commit ce99d329cf
• mo-tool: built from go.mod at commit 786e736810ad
• Infrastructure: TKE, amd64-mo-guangzhou-medium8 runner
• Data: big_data_test database with ~38 tables including 100M/1B row tables